CA1082995A - Leakage protective apparatus for storage containers or the like - Google Patents
Leakage protective apparatus for storage containers or the likeInfo
- Publication number
- CA1082995A CA1082995A CA262,349A CA262349A CA1082995A CA 1082995 A CA1082995 A CA 1082995A CA 262349 A CA262349 A CA 262349A CA 1082995 A CA1082995 A CA 1082995A
- Authority
- CA
- Canada
- Prior art keywords
- conduit
- intermediate container
- container
- negative pressure
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 11
- 230000009969 flowable effect Effects 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 18
- 230000003068 static effect Effects 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 9
- 229920003023 plastic Polymers 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- BHMLFPOTZYRDKA-IRXDYDNUSA-N (2s)-2-[(s)-(2-iodophenoxy)-phenylmethyl]morpholine Chemical compound IC1=CC=CC=C1O[C@@H](C=1C=CC=CC=1)[C@H]1OCCNC1 BHMLFPOTZYRDKA-IRXDYDNUSA-N 0.000 description 1
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 208000003251 Pruritus Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007803 itching Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Feeding And Controlling Fuel (AREA)
Abstract
ABSTRACT
A leakage protective apparatus for the outlet line of a storage container for flowable material includes a conduit arrangement which connects a storage container and consumer and itself includes a pump for pumping the flowable material from the storage container to the consumer. The conduit arrangement also includes an intermediate container connected between the pump and storage container. A negative pressure source is connected to the intermediate container. The conduit also includes a shutoff valve. A detecting means is provided for detecting a predetermined minimum negative pressure in the conduit arrangement, a switching device being provided for closing the shutoff valve when the detecting means detects a pressure above the predetermined minimum negative pressure.
A leakage protective apparatus for the outlet line of a storage container for flowable material includes a conduit arrangement which connects a storage container and consumer and itself includes a pump for pumping the flowable material from the storage container to the consumer. The conduit arrangement also includes an intermediate container connected between the pump and storage container. A negative pressure source is connected to the intermediate container. The conduit also includes a shutoff valve. A detecting means is provided for detecting a predetermined minimum negative pressure in the conduit arrangement, a switching device being provided for closing the shutoff valve when the detecting means detects a pressure above the predetermined minimum negative pressure.
Description
108~995 . BAC~GRO'uND OF TH3 INVENTIGN
The present invention relates to a new and improved constructior. of an outfiow or leakage protective a~parat~s for ~ st'orage container o~ the like for the storage of fluent or flowable storable materials, especially heatin~ oil, which . is supplied tc a consumer from the ~torage container by means or a pump through the agerlcy of a con~uit system or arrangement.
.
It is already known from Swiss Patent 423,379 to monitor leakc in the walls of storage containers, by ~lacing a reference char..ber under vacuum, this reference cilamber can be formed within the storage container itself abo~e the level of a liquid to be sto~ed, or further, it is known from Swis5 Pa~ent 410,5~2 that the reference chamber can be the intermedia~e compartment located between both walls of ~ j double-wall storage container.
In order, ~hen necessary, to p.-otect the conduit arrangement againc' any leakage or spill-out, its compo~ents, such as the outflow conduit and the return flow conduit, previously were mounted in a thick sleeve which returned any possible leak2ge back to the storage container. Such type safety system is complicated, especially when the same must be employed with irstallations which are already installed in the ground and previously were not provided with any safety dcvice
The present invention relates to a new and improved constructior. of an outfiow or leakage protective a~parat~s for ~ st'orage container o~ the like for the storage of fluent or flowable storable materials, especially heatin~ oil, which . is supplied tc a consumer from the ~torage container by means or a pump through the agerlcy of a con~uit system or arrangement.
.
It is already known from Swiss Patent 423,379 to monitor leakc in the walls of storage containers, by ~lacing a reference char..ber under vacuum, this reference cilamber can be formed within the storage container itself abo~e the level of a liquid to be sto~ed, or further, it is known from Swis5 Pa~ent 410,5~2 that the reference chamber can be the intermedia~e compartment located between both walls of ~ j double-wall storage container.
In order, ~hen necessary, to p.-otect the conduit arrangement againc' any leakage or spill-out, its compo~ents, such as the outflow conduit and the return flow conduit, previously were mounted in a thick sleeve which returned any possible leak2ge back to the storage container. Such type safety system is complicated, especially when the same must be employed with irstallations which are already installed in the ground and previously were not provided with any safety dcvice
-2-10829g5 . for the conduit arrangement, since subseGuent mo~if~cation of the installaticn requires exposing or laying-open the cor.duit arrangement. This necessitates complicated excavation and i,nst211aLion work.
" . . ~
SUMMARY OF T~.E ~NVENTION
Hence, it is a primary object of the present invention to pro~ide a new and improved construction of a leakage protectiv appar~tus for storage cGntainers or the like ~-hich is not associated with the aforementior,ed drawLacks and limitations of the prior art proposals.
Another ~nd more specific obj2ct of the present invention aims at providirg a simple ~nd positive leakage or spili protective apparatus o~ the previously ~lentione~ type which with very little ad~itional expenditure z.nd work, also can ~e subsequent,~y in~talied at storage eontainers alread~ mounted in the ground and insures for positi~e protection of the con~uit system or arrangement.
Now in order to implement these and still further objects of the invention, which will becom~ more readily apparent as the description proceeds, the invention contemplates the provision of a negative pressure source ~hich communicates with the condui,t arrangement. ~, . 1.
, ~ ~3- 1 108Z995 l , With the invention the conduit arrangement for the , stored material always is maintained at a negative pressure.
In this way there can be avcided any spill-out due to leaks.
', . .
! If the negative pressure, which, for instance, t should be reali~ed by utiliæation of a vacuum pump, is not sufficient due to the occurren,ce of a leak or a disturbance 7 at the negative pressure generator, then measures are " advantageously undertaken wherein the disturbance is indic~tedand/or the conveying of the stored material is automatically discontinued. According to the invention this is preferably t realized in that a shutoff valve is connected in the conduit arrangement, and a switching device is provided which can be actua~ed in the presence of a pressure change, this switching 1, device, upon exceeding a predetermined minimum negative pressure in the conduit arrangement, causing the snutoff valve to slose. With a leakage protective apparatus which is desianed in this manner there is realized a reliable protection for the conduit arrangement also in those instances where conduit component~ are located Delow the level of the storage container, as is oftentimes the case for older ground-sunk installatior,s which subsequently should be equipped with a leakage protective device for the conduit arrangement.
After closing of the shutoff valve the pump can still further c vey the mediam located between it and the shutoff _~_ 108;~995 valve, in order to thereafter be shutoff by means of a special switch which is responsive to the sucking-up of air. How~ver, the pump alo can be directly shu'off by the switching levice, for instance simultaneous with the shutting-off of the shutoff valve.
A preferred constructural manifestation of the invent on is realized if the negative pressure source is connected via an intermediate container which is arranged in the conduit arrangement and the actuation of the switching device ~s derived from a change in the level of the medium in the intermediate container. In this regard, it is preferable if the conduit branch be~ween the storage container and the lnterme~iate container opens from above into the interme~iate container. The conduit branch located betwe~n the irtermediate container and the pump, just as the intermediate container itself, can he free].y accessible. An outflow at this conduit portion, in the event of a leak, can thus be avoided in that the ¦
pressure generdted by the negative pressure source is so low that alsc at the lowest locations of the conduit arrangement, at which the static pressure produced by the liquid is at a maximum,the total pressure is smaller than the ambient pressure.
Protection against spill or outflo~ of the storage container itself is not subject matter of the invention. This protection can be accomplished i.n any other suitable and known 8~gS
manner, for instance by fabricating the storage container of plastic or coating the storage container with plastic. In these instances monitoring the storage container against leaks cannot be dispensed with.
In one aspect of the invention there is provided a leakage protective apparatus for the outlet line of a storage container for flowable material, comprising a storage container, a consumer, a conduit arrangement connect-ing the storage container and consumer, the conduit arrange-ment including a pump for pumping the flowable material from the storage container to the consumer, the conduit arrangement further including an intermediate container connected between the pump and storage container, a negative pressure source connected to the intermediate container, the conduit arrangement ~D~her including a shutoff valve, means for detecting a predetermined minimum negative pressure in the conduit arrangement, and a switching device for closing the valve when the detecting means detects a pressure above the predetermined minimum negative pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
Figure 1 is a schematic view of a first exemplary embodiment of leakage protective apparatus according to the invention employed with an oil heating installation:
Figure 2 illustrates a second exemplary embodiment of leakage protection apparatus employed with an oil heating installation:
1~82~95 Figure 3 is a third exemplary embodiment of leakage protection apparatus employed with an oil heating installation:
Figure 4 is a fourth exemplary embodiment of leakage protection device employed with an oil heating installation:
. . - 6a -~ 10825~95 DETAILED DE.~C~I~TI02~ O~ THE PREFE~RE~ EMBODIMENTS
. ~
Describing now the drawings, in Figure 1 -eference character 1 designates a dGuble-wall storage cont~iner for heatir~g oil. Between the metzlic outer jacket or shell 2 and an inner plastic jacket or shell 3 there is for~.ed an intermediate ~pace or compartment 4 which is filled with an open pore foam plastjc. This intermed~ate space 4 can be evacuated ~y meanfi of a not particularly illustrated vacuum conduit or line to a pressure Pl for leakage monitoring.
The storage container 1 is closed by means of a dome cover or cover member 5 which, for the illustrated exemplary embod$m~nt, need not be pressure tight, so that there can preva~l above the li~uid level 6 within the storage containe- ~
the ambient pressure pO~ ¦
The dome cover 5 has extending therethrough an outflow, conduit 7 and a return flow conduit 8 which, together with a pump 9 and a merely schematically illustrated consumer 50, form a flo~ circulation system. The pump 9, when in operation, circulates heating oil, a fraction of which, for instance 10 is consumed by the consumer, which may be for instance a burner or a heating vessel.
Furthermore, the dome cover ~ has piercingly extending therethrough a negative pressure conduit 10 which ~Jithin the 108;~15 internal space la of the storage container 1 flow commun-cates at location 8a with the return flow conduit 8. By means of its end lOa remote from the storage container 1 the nesative pressure conduit lG is connected with a negative pressure container 11 ~hich, in turn, flow communicates via a connection conduit 12 with a vacuum pump 13. The vacuum pump 13 produces within the neg~tive pressure container 11 a pressure P2 which is smaller thzn the am~ient pressure pO, however greater than t~.e pressure Pl i.n the space between both walls 2, 3. The pressure P2 therefore should not be selectPd to be smaller than the pressure Pl~ so that the plastic inner wall 3, for instance consis.ing of a flexible plastic material, is not sucked or pressed into the interior or internal space la of the storage container 1.
During operation, there is ~oxmed a li~uid level or column 14 in t}-e negative pressure container 11, above which there exists a cushi~n of air at the pressure P2. This pressure P2 is delivered via a conduit 15 to a switrhing or regulation device designated in its entirety by reference character 16, this switching device con'.aining a pressure measuring device, âS schematically represented by reference cnaracter 16a. The switching device 16 compares the measured pressure P2 with a predeterrnined reference pressure. ~f the pressure P2 exceeds a predetermined minimum negative pressure, then the s-~itching device 16 automatically turns-on the vacuum ~ump 13, which again produces a pressure in the negative pressure~
contairler 11 corresponding to the reference negative pressure.
The switching device 16 is connected via a signal flow line 17 with the pump 9 for actuating i.e. turning-on and turning~
off such pump for circulating the heating oil.
If any leaks in the conduit system or arrangement 7, 8 for~ing the flow circulation system become too large, then even with continuous operation of the vacuum pump 13, the pressure P2 no longer can be maintained in the negative pressure container. In this case there exists an acute spill-out danger of heating oil through the aforementioned leakage location or locations. Upon excee~ing the minimllm negative pressure in the container 11 the regulation or switching device 16 therefore automatically shuts-off the pu~.p 9 by means of the si~-nal flow line 17. There is advantageously simultaneously activated a disturbazlce indicator by the regulation or switching device 16.
It wi31 be seen that the negative pressure ccntainer 11 additionally also can be connected at the outflow conduit or line .7. Also the negative pressure conduit 10 can communicate externally of the inner space or coml)artmen~ la of the storage container 1 with the return flow conduit 8 and the outflow conduit 7.
In the variant embodiment of Figure 2 there is designated in its entirety by reference character 101 a double-wa'l stoxage container for heating oil. Between the metallic outer shell or jacket 102 and an inner plastic jacket or I _g_ shell 103 there is formed an intermediate space or compartment 104 which can he filled with an open pore foam plastic. This intermediate space 104 can be mainta.ined by a not particularly j .
illustrated negative pressure line at a pressure ~1 below the ambient pressure pO~ .
The storage container 101 is closed by means of a dom2 or dome cover 105, through which piercingly extends a vent pipe or conduit 106, so that there also exists above the liquid level the ambient pressuxe pO in the storage containe~ 101.
Furthermore, there piercingly extends through the dome co~rer lOS an outflow conduit or line 107 which extends from the base OL the C.torage container 101 ~o a burner pump 109 of ~ burner 110. I.eading back frGm the nump 109 into the outflow conduit 107 is a return flow conduit 108, which however can be omitted. In th~ outflow conduit 107 there is installed a shutoff valve 111 directly a~ove the dome cover lG5. This shutoff valve 111 can be actuated by means of a signal flow line 112 from a switching or regulation o.evice 113. Into the conduit section 107a of the outflow conduit or line 107 between the pump ].Og and the shutoff valve 111, there opens a branch conduit 114 leading to an intermediate container 115. At the top of this intermediate container llS there is connected, by means of a conduit ~16, a vacuum pump 117. The conduit 116 can be shutoff or closed by means of, for instance, a manually 108~995 actuated shutoff valve 118. At two different levels of the intermediate container 115 there are arranged the level sensors or feelers 119 and 120. The upper level feeler 119, when the liquid level in the intermediate container 115 drops ~elow its level, is energized so as to produce a switching pulse which turns-on the vacuum punlp 117. This switching pulse is delive~ed to the vacuum pump 117 via the signal flow line 121. The lower level feeler 120, ~hen the liquid level in the intermediate container 115 drops ~elow it~ level, acts through the agency of a siynal flow line 122, eitner by means of the pump 109 or directly(as shown in broken lines), upon the switching device 113, in order to trigger a switching signal which blocks the shutoff valve 111. The shutoff valve 111 ls pref~rably initially blocked by the switching device 113 befo~e the pump 109 is turned-off. The pump 109 can receive a shutoff pulse, completely independent of the signal of the level feel~r, for instance as soon as it conveys air instea~ of liquid to the burner 110 defining the consumer.
If a leak arises in the cor.duit arrangement or system between the storage container 101 and the pump 109, then initially aue to the dropping of the liauid level in the intermediate container li5 the vacuum pump 117 is turned on by means of the level feeler 119. During further sinking of the liquid level below the level of the level feeler 120 there i.s delivered, via the sigllal flow line i22, a switching signal which activates the switching device 113 for closing the shutoff 1~8Z995 . valve 111. The arrangement is advantageously undertaken such that the pump 109 still then pumps the liquid which is located between the shutoff valve 111 and the pump 109 to the burner .
and then is shutoff by the air conveyed into the pump.
I . , The dor.le cover 105 additionally has piercingly extendins therethrough a measuring line or conductor 125, leading to the base of the container 1Ol and connected with the .nter~
mediate container 115. Also connected with this measuring line or conductor 125, without which the leakage proteciion device li~ewise would be functional, is a shutoff valve 126. This shutoff valve 126 can be simultaneously blockPd along with the shutoff valve 111 by means of a branch line 127 leading from the ~ign~l flow line 112, so that also the measuring line 125 which, in the exemplary embodiment, forms part of the conduit arrangement is protected against leaks.
With the embodimet o Figure 3 the parts of the conduit arrangement or system including the pump 209 and the burner 210 are a_ranged below the level sf the container 101, ~itho~t impairing the function of the spill or leakage protection. A
still more important difference in the embodiment of Figure 3, in contrast to that of Figure 2, resides in the fact that the intermediate container 215 is connected with the outflow conduit 207. The conduit portion or section 207a between the pum 09 and the intermediate container 215, for ~nstallation~
1082ggS
normally encountered in practice, is generally short and easily accessible (above ground), whereas the conduit portion 207b between the intermediate container 215 and the shutoff ~alve 211 is longer and is embed~ed in the ground. In this way there is eliminated the possibility that air will be sucked-up ~y the pump 209 into the burner 21G before all of the liquid has been sucked-out of the intermediate container 215. With the em~odiment of Figure 3 there is not pro~ided any measuring line corresponding to the measuring line 125 of Figure 2. The level feeler 220 is directly connected with the switching device 213 via the signal flow line or conductor 222. Leading from such switching device 213 is a further signal flow line 219 to the switch of the pump 209.
~ oun~ed in the outflow line or conduit 207, directly in frcnt of the pump 209, is a check valve 228, which prevents any return flow of liquid from the pump 209 to the intermediate container 215. l'his does not preclude that, also with the embod~ment of Figure 3, there is provi.ded a return flow line or conduit leadiny from the pump 209, which ~an communicate in frort of or ~ehind the check valve 228, with the outflow line or conduit.
Upon the occurrence of a leak in the conduit arrangement the switching device 213, by means of 1-he signal flow line 229, simultaneously also shutsoff the pu~.p 209 together with closing of the shu.off valve 211. The pump 209 can also be shutoff with a tlme-delay after the closing of the shu-toff valve 211, which however should be of shorter duration than the time needed for ¦
sucking-up the liquid in the intermediate container 215, so that there can be avoided sucking-up of air through the pump 203.
In other respects the construction and function of the embodiment of Fiyure 3 corresponds to that of Figure 2, so that any additional description is unnecessary, speci,ically since reference can again be made to the disclosure concernin~
~'iguxe 2.
Now in Figure 4 the functionally same components as those of th~ ~mbodiment of Flgure 3 have been de.signated with the corresponding refercnce character but increased by the value 100. Further, in order to avoid unnecessary repetit~on the same structure has not ayain been here described. The description of Figure 4 ti-hereforwill be concerned predomi.nantly with the difference in its construction from that of the previously described exemplary embodiments.
Similarly as with the embodiment of Figure 3 also with the embodiment of Figure 4 the intermediate container 315 is directly connected with the conduit arrangement 307 between the storage container 301. and the pump 3~9.
108;~995 . The intermediate container 315 is arranged at the elevational dif~erence hl above the lowermost level of the storage container 301. In the illustrated embodiment, the pump 309 and the conduit branch 307a supplying such pump of the conduit arrangement 307 are each located with its lowermost portion disposed at the sar,e level as the lowermost lev~l of the storage container 301, however also could be situated lower and of course also higher, without thereby impairing thc functionality of the leakage protection device. For instance, the height hl can amount to three meters. Also in this cas~
in order to be able to completel~ protect the conduit portion 307a, the negative pressure in the intermediate container 315, at most can attain a value of absolute 7mWs (with t~is embodiment it has been assumed by way of simplification that the stored material has the same specific weiyht as water).
The branch conduit 307b is located with one part above the intermediate container 315 and opens thereinto from the top. In this way there is insured thac e~en with a pressure increase in the intermediate container, for instance owing to a disturbance during generation of the negative pressu.e, liquid flows out of this conduit b-anch into the intermediate container.
In Figure 4 there have been schematically illustrated . the switching device 313 and the negative pressure source 317 grouped together into a box designated by reference character 340. This box svmboliæes the housing of a device, as the same is used in practice for grouping together the aforementioned components ~s well as other components, for instance an indicatQr. qhe device additionally can encompass a leakage protection device for the wall of the container 301. Essenti.al].y there is associated with such second leakag~ protection dev.i.ce a suction line 331, by means of which there is produced a negative pressure of a pressure Pl in the space between both container walls 302 and 303, as well as a measuring line 332, by means of wh~ rh there is measured the negative measure. .~n increase in the pressure Pl beyond a predetermined value indicate ;
a leakaye in the container wall 303. The suction conduit or line 331 also contains a shutoff valve 333.
Also the embodiment of Figure 4 is equipped with a return flow conduit or line 308 at which tilere is a.rranged a shutoff valve 1n the form of a magnetic valve 334, actuated by an electrical pulse delivered by the signal flow line 335 leading from th~ pump.
The overflow or leakage protective apparatus depic'ed in Figure 4 operates as follows:
With the illustrated arrangement all of the branch conduits 307a, 307b and 308 of the conduit arrangernent or system ¦ 307 are exposed to the negative pressure prevail.ing in the l -16-intermediate container 315 and therefore are monitored. The precondition for the build-up of the negative pressure is that the infeed lir.e, leading from the inner space 341 of the storage container 301 which is not at negative pressure, is tight or leakproof.
Now if the pump 309 is turned-on and the burner 310 is ignited, then the pump 309 sucks oil out of the intermediate container 315. As soon as the level in the intermediate container 315 drops below the level feeler 320, then, the level feeler 320 delivers a pulse to the switching device 313, which, in turn, transmits a switching pulse via the signal flow line 312 to the shutoff valve 311 likewise constructed as a magne'ic valve, in order to open such shutoff valve. Due to the negative pressure ln the space above the oil level in the intermedlate contalner 315 oil is now sucked up via the branch conduit 307b lr.to the intermediate container, until the level again rises past the level feeler 320. Consequently, by means of a new pulse delivered by the level feeler 320 and a switching pulso triggered thereby by means of the switching device 313 the shutoff valve 311 is closed.
In the following cases the leakage protection apparatus t described in conjunction with ~igure 4 triggers switching operations and an alarm:
~ .
lU8~995 (1) If a leak in a branch conduit 307a, 307b, and/or 308 becomes so large that the pump 317 no longer can maintain a predetermined negative pressure, then the shutoff valve 311 is closed and triggers an alarm.
If the leak occurs at the non-accessible ccnduit branch 3G7b, then the liquid located between the leakage location and the intermediate container 315 flows into the ~ntermediate container, and the liquid located in the conduit branch section between the leakage location and the shutoff valve 311 remains in the aforesaid branch conduit section and does not flow-out. Thus, there is insured a complete control of lea~s at random locations of the non-accessible branch conduit 307b between the intermediate container 315 and the shu10f~ valve 311 and ~here is eliminated any uncontrolled leakage from the storage container or outflow from liquid located in the conduit branch sections.
(2) If the level feeler 320 is not in operation with the shutoff valve closed, that is to say with the oil level below its level, then the shutoff valve 311 remains closed. The pump 309 sucks the intermediate container 315 empty an~ tri~gers an alarm.
~ 3) In the event that the level feeler 320 becomes inoperative with the shutoff valve 311 opened, that is to say, with a higher liquid level than its level in the intermediate 108Z9g5 container 312, for instance owing to rupture, then the shutoff valve 311 initially remains open. The intermediate container 315 receives too much oil, so that the pressure ~n the interrr,ediate container 315 climbs beyond the mzximum permi~sible negativ,~ pressure. This again triggers an alarm 340 and thus the delivery of a closing signal via the line 312 to the ~hutoff valve 311. At this point in time the intermediate ccntainer 3]5 is not completely full, so that the vacuum pump 317 can again build up the vacuum in the space above the liquid level in the intermediate container 315. As a result, the alarm is automatically shutoff and the shutoff valve 311 is again opened so that once again oil can flow into the intermediate contai,ner 315. This results in the peri~issible negative pressure in the intermediate container 315 again being exceeded. When the intermediate container 315 is full, then a signal is triggered ~.~hich blocks a magnetic valve 318 and ~he suction conduit 316 of the vacuum pump 317 via the signal flow line 342. Now a negative pressu_e no longer can build up in the intermediate container 315, so that the alarm conditicn is maintained and the shutoff valve 311 remains closed. With this condition the pump 309, in turn, due to sucking oil out of the intermediate container 315 and by thus building up a negative pressure in the space above the oil ¦
level, can shut off the alarm. The alarm condition is again however rapidly established, because the oil which flows in via the branch conduit 307b again permits the thus generated negative pressure to immediately climb to an impermissi~ly 1~8Z995 high va3ue. Thus, also with this last-described disturbance the alarm is also maintained.
The intermediate container, with the embodiments of Figure 3 and 4, as also the branch conduits 207a and 307 respectively, can be freely accessible. The intermediate container, in this case, can be provided with a viewing glass for¦
the optical control of the level of the oil in the intermediat.?
container, which i5 important for the f~nctionality of the equip-ment.
While there are showr. and described preferred embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto, but may be otherwise variously embodicd and practiced within the scope of the iollowlng claims. ACCOF:DINGLY,
" . . ~
SUMMARY OF T~.E ~NVENTION
Hence, it is a primary object of the present invention to pro~ide a new and improved construction of a leakage protectiv appar~tus for storage cGntainers or the like ~-hich is not associated with the aforementior,ed drawLacks and limitations of the prior art proposals.
Another ~nd more specific obj2ct of the present invention aims at providirg a simple ~nd positive leakage or spili protective apparatus o~ the previously ~lentione~ type which with very little ad~itional expenditure z.nd work, also can ~e subsequent,~y in~talied at storage eontainers alread~ mounted in the ground and insures for positi~e protection of the con~uit system or arrangement.
Now in order to implement these and still further objects of the invention, which will becom~ more readily apparent as the description proceeds, the invention contemplates the provision of a negative pressure source ~hich communicates with the condui,t arrangement. ~, . 1.
, ~ ~3- 1 108Z995 l , With the invention the conduit arrangement for the , stored material always is maintained at a negative pressure.
In this way there can be avcided any spill-out due to leaks.
', . .
! If the negative pressure, which, for instance, t should be reali~ed by utiliæation of a vacuum pump, is not sufficient due to the occurren,ce of a leak or a disturbance 7 at the negative pressure generator, then measures are " advantageously undertaken wherein the disturbance is indic~tedand/or the conveying of the stored material is automatically discontinued. According to the invention this is preferably t realized in that a shutoff valve is connected in the conduit arrangement, and a switching device is provided which can be actua~ed in the presence of a pressure change, this switching 1, device, upon exceeding a predetermined minimum negative pressure in the conduit arrangement, causing the snutoff valve to slose. With a leakage protective apparatus which is desianed in this manner there is realized a reliable protection for the conduit arrangement also in those instances where conduit component~ are located Delow the level of the storage container, as is oftentimes the case for older ground-sunk installatior,s which subsequently should be equipped with a leakage protective device for the conduit arrangement.
After closing of the shutoff valve the pump can still further c vey the mediam located between it and the shutoff _~_ 108;~995 valve, in order to thereafter be shutoff by means of a special switch which is responsive to the sucking-up of air. How~ver, the pump alo can be directly shu'off by the switching levice, for instance simultaneous with the shutting-off of the shutoff valve.
A preferred constructural manifestation of the invent on is realized if the negative pressure source is connected via an intermediate container which is arranged in the conduit arrangement and the actuation of the switching device ~s derived from a change in the level of the medium in the intermediate container. In this regard, it is preferable if the conduit branch be~ween the storage container and the lnterme~iate container opens from above into the interme~iate container. The conduit branch located betwe~n the irtermediate container and the pump, just as the intermediate container itself, can he free].y accessible. An outflow at this conduit portion, in the event of a leak, can thus be avoided in that the ¦
pressure generdted by the negative pressure source is so low that alsc at the lowest locations of the conduit arrangement, at which the static pressure produced by the liquid is at a maximum,the total pressure is smaller than the ambient pressure.
Protection against spill or outflo~ of the storage container itself is not subject matter of the invention. This protection can be accomplished i.n any other suitable and known 8~gS
manner, for instance by fabricating the storage container of plastic or coating the storage container with plastic. In these instances monitoring the storage container against leaks cannot be dispensed with.
In one aspect of the invention there is provided a leakage protective apparatus for the outlet line of a storage container for flowable material, comprising a storage container, a consumer, a conduit arrangement connect-ing the storage container and consumer, the conduit arrange-ment including a pump for pumping the flowable material from the storage container to the consumer, the conduit arrangement further including an intermediate container connected between the pump and storage container, a negative pressure source connected to the intermediate container, the conduit arrangement ~D~her including a shutoff valve, means for detecting a predetermined minimum negative pressure in the conduit arrangement, and a switching device for closing the valve when the detecting means detects a pressure above the predetermined minimum negative pressure.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:
Figure 1 is a schematic view of a first exemplary embodiment of leakage protective apparatus according to the invention employed with an oil heating installation:
Figure 2 illustrates a second exemplary embodiment of leakage protection apparatus employed with an oil heating installation:
1~82~95 Figure 3 is a third exemplary embodiment of leakage protection apparatus employed with an oil heating installation:
Figure 4 is a fourth exemplary embodiment of leakage protection device employed with an oil heating installation:
. . - 6a -~ 10825~95 DETAILED DE.~C~I~TI02~ O~ THE PREFE~RE~ EMBODIMENTS
. ~
Describing now the drawings, in Figure 1 -eference character 1 designates a dGuble-wall storage cont~iner for heatir~g oil. Between the metzlic outer jacket or shell 2 and an inner plastic jacket or shell 3 there is for~.ed an intermediate ~pace or compartment 4 which is filled with an open pore foam plastjc. This intermed~ate space 4 can be evacuated ~y meanfi of a not particularly illustrated vacuum conduit or line to a pressure Pl for leakage monitoring.
The storage container 1 is closed by means of a dome cover or cover member 5 which, for the illustrated exemplary embod$m~nt, need not be pressure tight, so that there can preva~l above the li~uid level 6 within the storage containe- ~
the ambient pressure pO~ ¦
The dome cover 5 has extending therethrough an outflow, conduit 7 and a return flow conduit 8 which, together with a pump 9 and a merely schematically illustrated consumer 50, form a flo~ circulation system. The pump 9, when in operation, circulates heating oil, a fraction of which, for instance 10 is consumed by the consumer, which may be for instance a burner or a heating vessel.
Furthermore, the dome cover ~ has piercingly extending therethrough a negative pressure conduit 10 which ~Jithin the 108;~15 internal space la of the storage container 1 flow commun-cates at location 8a with the return flow conduit 8. By means of its end lOa remote from the storage container 1 the nesative pressure conduit lG is connected with a negative pressure container 11 ~hich, in turn, flow communicates via a connection conduit 12 with a vacuum pump 13. The vacuum pump 13 produces within the neg~tive pressure container 11 a pressure P2 which is smaller thzn the am~ient pressure pO, however greater than t~.e pressure Pl i.n the space between both walls 2, 3. The pressure P2 therefore should not be selectPd to be smaller than the pressure Pl~ so that the plastic inner wall 3, for instance consis.ing of a flexible plastic material, is not sucked or pressed into the interior or internal space la of the storage container 1.
During operation, there is ~oxmed a li~uid level or column 14 in t}-e negative pressure container 11, above which there exists a cushi~n of air at the pressure P2. This pressure P2 is delivered via a conduit 15 to a switrhing or regulation device designated in its entirety by reference character 16, this switching device con'.aining a pressure measuring device, âS schematically represented by reference cnaracter 16a. The switching device 16 compares the measured pressure P2 with a predeterrnined reference pressure. ~f the pressure P2 exceeds a predetermined minimum negative pressure, then the s-~itching device 16 automatically turns-on the vacuum ~ump 13, which again produces a pressure in the negative pressure~
contairler 11 corresponding to the reference negative pressure.
The switching device 16 is connected via a signal flow line 17 with the pump 9 for actuating i.e. turning-on and turning~
off such pump for circulating the heating oil.
If any leaks in the conduit system or arrangement 7, 8 for~ing the flow circulation system become too large, then even with continuous operation of the vacuum pump 13, the pressure P2 no longer can be maintained in the negative pressure container. In this case there exists an acute spill-out danger of heating oil through the aforementioned leakage location or locations. Upon excee~ing the minimllm negative pressure in the container 11 the regulation or switching device 16 therefore automatically shuts-off the pu~.p 9 by means of the si~-nal flow line 17. There is advantageously simultaneously activated a disturbazlce indicator by the regulation or switching device 16.
It wi31 be seen that the negative pressure ccntainer 11 additionally also can be connected at the outflow conduit or line .7. Also the negative pressure conduit 10 can communicate externally of the inner space or coml)artmen~ la of the storage container 1 with the return flow conduit 8 and the outflow conduit 7.
In the variant embodiment of Figure 2 there is designated in its entirety by reference character 101 a double-wa'l stoxage container for heating oil. Between the metallic outer shell or jacket 102 and an inner plastic jacket or I _g_ shell 103 there is formed an intermediate space or compartment 104 which can he filled with an open pore foam plastic. This intermediate space 104 can be mainta.ined by a not particularly j .
illustrated negative pressure line at a pressure ~1 below the ambient pressure pO~ .
The storage container 101 is closed by means of a dom2 or dome cover 105, through which piercingly extends a vent pipe or conduit 106, so that there also exists above the liquid level the ambient pressuxe pO in the storage containe~ 101.
Furthermore, there piercingly extends through the dome co~rer lOS an outflow conduit or line 107 which extends from the base OL the C.torage container 101 ~o a burner pump 109 of ~ burner 110. I.eading back frGm the nump 109 into the outflow conduit 107 is a return flow conduit 108, which however can be omitted. In th~ outflow conduit 107 there is installed a shutoff valve 111 directly a~ove the dome cover lG5. This shutoff valve 111 can be actuated by means of a signal flow line 112 from a switching or regulation o.evice 113. Into the conduit section 107a of the outflow conduit or line 107 between the pump ].Og and the shutoff valve 111, there opens a branch conduit 114 leading to an intermediate container 115. At the top of this intermediate container llS there is connected, by means of a conduit ~16, a vacuum pump 117. The conduit 116 can be shutoff or closed by means of, for instance, a manually 108~995 actuated shutoff valve 118. At two different levels of the intermediate container 115 there are arranged the level sensors or feelers 119 and 120. The upper level feeler 119, when the liquid level in the intermediate container 115 drops ~elow its level, is energized so as to produce a switching pulse which turns-on the vacuum punlp 117. This switching pulse is delive~ed to the vacuum pump 117 via the signal flow line 121. The lower level feeler 120, ~hen the liquid level in the intermediate container 115 drops ~elow it~ level, acts through the agency of a siynal flow line 122, eitner by means of the pump 109 or directly(as shown in broken lines), upon the switching device 113, in order to trigger a switching signal which blocks the shutoff valve 111. The shutoff valve 111 ls pref~rably initially blocked by the switching device 113 befo~e the pump 109 is turned-off. The pump 109 can receive a shutoff pulse, completely independent of the signal of the level feel~r, for instance as soon as it conveys air instea~ of liquid to the burner 110 defining the consumer.
If a leak arises in the cor.duit arrangement or system between the storage container 101 and the pump 109, then initially aue to the dropping of the liauid level in the intermediate container li5 the vacuum pump 117 is turned on by means of the level feeler 119. During further sinking of the liquid level below the level of the level feeler 120 there i.s delivered, via the sigllal flow line i22, a switching signal which activates the switching device 113 for closing the shutoff 1~8Z995 . valve 111. The arrangement is advantageously undertaken such that the pump 109 still then pumps the liquid which is located between the shutoff valve 111 and the pump 109 to the burner .
and then is shutoff by the air conveyed into the pump.
I . , The dor.le cover 105 additionally has piercingly extendins therethrough a measuring line or conductor 125, leading to the base of the container 1Ol and connected with the .nter~
mediate container 115. Also connected with this measuring line or conductor 125, without which the leakage proteciion device li~ewise would be functional, is a shutoff valve 126. This shutoff valve 126 can be simultaneously blockPd along with the shutoff valve 111 by means of a branch line 127 leading from the ~ign~l flow line 112, so that also the measuring line 125 which, in the exemplary embodiment, forms part of the conduit arrangement is protected against leaks.
With the embodimet o Figure 3 the parts of the conduit arrangement or system including the pump 209 and the burner 210 are a_ranged below the level sf the container 101, ~itho~t impairing the function of the spill or leakage protection. A
still more important difference in the embodiment of Figure 3, in contrast to that of Figure 2, resides in the fact that the intermediate container 215 is connected with the outflow conduit 207. The conduit portion or section 207a between the pum 09 and the intermediate container 215, for ~nstallation~
1082ggS
normally encountered in practice, is generally short and easily accessible (above ground), whereas the conduit portion 207b between the intermediate container 215 and the shutoff ~alve 211 is longer and is embed~ed in the ground. In this way there is eliminated the possibility that air will be sucked-up ~y the pump 209 into the burner 21G before all of the liquid has been sucked-out of the intermediate container 215. With the em~odiment of Figure 3 there is not pro~ided any measuring line corresponding to the measuring line 125 of Figure 2. The level feeler 220 is directly connected with the switching device 213 via the signal flow line or conductor 222. Leading from such switching device 213 is a further signal flow line 219 to the switch of the pump 209.
~ oun~ed in the outflow line or conduit 207, directly in frcnt of the pump 209, is a check valve 228, which prevents any return flow of liquid from the pump 209 to the intermediate container 215. l'his does not preclude that, also with the embod~ment of Figure 3, there is provi.ded a return flow line or conduit leadiny from the pump 209, which ~an communicate in frort of or ~ehind the check valve 228, with the outflow line or conduit.
Upon the occurrence of a leak in the conduit arrangement the switching device 213, by means of 1-he signal flow line 229, simultaneously also shutsoff the pu~.p 209 together with closing of the shu.off valve 211. The pump 209 can also be shutoff with a tlme-delay after the closing of the shu-toff valve 211, which however should be of shorter duration than the time needed for ¦
sucking-up the liquid in the intermediate container 215, so that there can be avoided sucking-up of air through the pump 203.
In other respects the construction and function of the embodiment of Fiyure 3 corresponds to that of Figure 2, so that any additional description is unnecessary, speci,ically since reference can again be made to the disclosure concernin~
~'iguxe 2.
Now in Figure 4 the functionally same components as those of th~ ~mbodiment of Flgure 3 have been de.signated with the corresponding refercnce character but increased by the value 100. Further, in order to avoid unnecessary repetit~on the same structure has not ayain been here described. The description of Figure 4 ti-hereforwill be concerned predomi.nantly with the difference in its construction from that of the previously described exemplary embodiments.
Similarly as with the embodiment of Figure 3 also with the embodiment of Figure 4 the intermediate container 315 is directly connected with the conduit arrangement 307 between the storage container 301. and the pump 3~9.
108;~995 . The intermediate container 315 is arranged at the elevational dif~erence hl above the lowermost level of the storage container 301. In the illustrated embodiment, the pump 309 and the conduit branch 307a supplying such pump of the conduit arrangement 307 are each located with its lowermost portion disposed at the sar,e level as the lowermost lev~l of the storage container 301, however also could be situated lower and of course also higher, without thereby impairing thc functionality of the leakage protection device. For instance, the height hl can amount to three meters. Also in this cas~
in order to be able to completel~ protect the conduit portion 307a, the negative pressure in the intermediate container 315, at most can attain a value of absolute 7mWs (with t~is embodiment it has been assumed by way of simplification that the stored material has the same specific weiyht as water).
The branch conduit 307b is located with one part above the intermediate container 315 and opens thereinto from the top. In this way there is insured thac e~en with a pressure increase in the intermediate container, for instance owing to a disturbance during generation of the negative pressu.e, liquid flows out of this conduit b-anch into the intermediate container.
In Figure 4 there have been schematically illustrated . the switching device 313 and the negative pressure source 317 grouped together into a box designated by reference character 340. This box svmboliæes the housing of a device, as the same is used in practice for grouping together the aforementioned components ~s well as other components, for instance an indicatQr. qhe device additionally can encompass a leakage protection device for the wall of the container 301. Essenti.al].y there is associated with such second leakag~ protection dev.i.ce a suction line 331, by means of which there is produced a negative pressure of a pressure Pl in the space between both container walls 302 and 303, as well as a measuring line 332, by means of wh~ rh there is measured the negative measure. .~n increase in the pressure Pl beyond a predetermined value indicate ;
a leakaye in the container wall 303. The suction conduit or line 331 also contains a shutoff valve 333.
Also the embodiment of Figure 4 is equipped with a return flow conduit or line 308 at which tilere is a.rranged a shutoff valve 1n the form of a magnetic valve 334, actuated by an electrical pulse delivered by the signal flow line 335 leading from th~ pump.
The overflow or leakage protective apparatus depic'ed in Figure 4 operates as follows:
With the illustrated arrangement all of the branch conduits 307a, 307b and 308 of the conduit arrangernent or system ¦ 307 are exposed to the negative pressure prevail.ing in the l -16-intermediate container 315 and therefore are monitored. The precondition for the build-up of the negative pressure is that the infeed lir.e, leading from the inner space 341 of the storage container 301 which is not at negative pressure, is tight or leakproof.
Now if the pump 309 is turned-on and the burner 310 is ignited, then the pump 309 sucks oil out of the intermediate container 315. As soon as the level in the intermediate container 315 drops below the level feeler 320, then, the level feeler 320 delivers a pulse to the switching device 313, which, in turn, transmits a switching pulse via the signal flow line 312 to the shutoff valve 311 likewise constructed as a magne'ic valve, in order to open such shutoff valve. Due to the negative pressure ln the space above the oil level in the intermedlate contalner 315 oil is now sucked up via the branch conduit 307b lr.to the intermediate container, until the level again rises past the level feeler 320. Consequently, by means of a new pulse delivered by the level feeler 320 and a switching pulso triggered thereby by means of the switching device 313 the shutoff valve 311 is closed.
In the following cases the leakage protection apparatus t described in conjunction with ~igure 4 triggers switching operations and an alarm:
~ .
lU8~995 (1) If a leak in a branch conduit 307a, 307b, and/or 308 becomes so large that the pump 317 no longer can maintain a predetermined negative pressure, then the shutoff valve 311 is closed and triggers an alarm.
If the leak occurs at the non-accessible ccnduit branch 3G7b, then the liquid located between the leakage location and the intermediate container 315 flows into the ~ntermediate container, and the liquid located in the conduit branch section between the leakage location and the shutoff valve 311 remains in the aforesaid branch conduit section and does not flow-out. Thus, there is insured a complete control of lea~s at random locations of the non-accessible branch conduit 307b between the intermediate container 315 and the shu10f~ valve 311 and ~here is eliminated any uncontrolled leakage from the storage container or outflow from liquid located in the conduit branch sections.
(2) If the level feeler 320 is not in operation with the shutoff valve closed, that is to say with the oil level below its level, then the shutoff valve 311 remains closed. The pump 309 sucks the intermediate container 315 empty an~ tri~gers an alarm.
~ 3) In the event that the level feeler 320 becomes inoperative with the shutoff valve 311 opened, that is to say, with a higher liquid level than its level in the intermediate 108Z9g5 container 312, for instance owing to rupture, then the shutoff valve 311 initially remains open. The intermediate container 315 receives too much oil, so that the pressure ~n the interrr,ediate container 315 climbs beyond the mzximum permi~sible negativ,~ pressure. This again triggers an alarm 340 and thus the delivery of a closing signal via the line 312 to the ~hutoff valve 311. At this point in time the intermediate ccntainer 3]5 is not completely full, so that the vacuum pump 317 can again build up the vacuum in the space above the liquid level in the intermediate container 315. As a result, the alarm is automatically shutoff and the shutoff valve 311 is again opened so that once again oil can flow into the intermediate contai,ner 315. This results in the peri~issible negative pressure in the intermediate container 315 again being exceeded. When the intermediate container 315 is full, then a signal is triggered ~.~hich blocks a magnetic valve 318 and ~he suction conduit 316 of the vacuum pump 317 via the signal flow line 342. Now a negative pressu_e no longer can build up in the intermediate container 315, so that the alarm conditicn is maintained and the shutoff valve 311 remains closed. With this condition the pump 309, in turn, due to sucking oil out of the intermediate container 315 and by thus building up a negative pressure in the space above the oil ¦
level, can shut off the alarm. The alarm condition is again however rapidly established, because the oil which flows in via the branch conduit 307b again permits the thus generated negative pressure to immediately climb to an impermissi~ly 1~8Z995 high va3ue. Thus, also with this last-described disturbance the alarm is also maintained.
The intermediate container, with the embodiments of Figure 3 and 4, as also the branch conduits 207a and 307 respectively, can be freely accessible. The intermediate container, in this case, can be provided with a viewing glass for¦
the optical control of the level of the oil in the intermediat.?
container, which i5 important for the f~nctionality of the equip-ment.
While there are showr. and described preferred embodiments of the invention, it is to be distinctly understood that the invention is not limited thereto, but may be otherwise variously embodicd and practiced within the scope of the iollowlng claims. ACCOF:DINGLY,
Claims (13)
1. A leakage protective apparatus for the outlet line of a storage container for flowable material, comprising a storage container, a consumer, a conduit arrangement connecting the storage container and consumer, the conduit arrangement including a pump for pumping the flowable material from the storage container to the consumer, the conduit arrangement further including an intermediate container connected between the pump and storage container, a negative pressure source connected to the intermediate container, the conduit arrangement further including a shutoff valve, means for detecting a predetermined minimum negative pressure in the conduit arrangement, and a switching device for closing the valve when the detecting means detects a pressure above the pre-determined minimum negative pressure.
2. The apparatus as defined in claim 1, wherein the conduit arrangement comprises an outflow conduit means and a return flow conduit means, the negative pressure source communicating with the outflow conduit means.
3. The apparatus as defined in claim 1, including means for shutting-off the pump upon exceeding said minimum negative pressure.
4. The apparatus as defined in claim 1, wherein a level feeler is arranged in the intermediate container, said level feeler being activated by the level of the medium for delivering a switching pulse to the switching device.
5. The apparatus as defined in claim 4, including a further level feeler located at a higher level than the other level feeler in the intermediate container, said further level feeler delivering a switching pulse upon activation by the level of the medium, which switching pulse switches-on the negative pressure source, said negative pressure source comprising a vacuum pump.
6. The apparatus as defined in claim 5, further including a branch conduit for connecting the intermediate container with the conduit arrangement.
7. The apparatus as defined in claim 5, wherein the intermediate container is connected at the conduit arrangement.
8. The apparatus as defined in claim 7, further including a branch conduit member which opens between the storage container and the intermediate container from above into said intermediate container.
9. The apparatus as defined in claim 8, wherein the intermediate container is located at a higher level than the pump both said intermediate container and said branch conduit member freely accessible, said branch conduit member extending between said intermediate container and said pump.
10. The apparatus as defined in claim 7, wherein the conduit arrangement includes an outflow conduit, said shutoff valve being arranged in said outflow conduit between the intermediate container and the storage container.
11. The apparatus as defined in claim 1, wherein the pressure generated by the negative pressure source is so small that even at the lowest location of the conduit arrange-ment at which the static pressure produced by the liquid column is at a maximum, the total pressure is smaller than the ambient pressure.
12. The apparatus as defined in claim 1, wherein the conduit arrangement includes an outflow conduit extending from said intermediate container, and the shutoff valve is arranged in the outflow conduit at a location where it departs out of the storage container.
13. The apparatus of claim 1, wherein the conduit arrangement further includes a return flow conduit connected between the consumer and intermediate container.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH12946/75 | 1975-10-06 | ||
| CH1294675A CH586633A5 (en) | 1975-10-06 | 1975-10-06 | Liq. tank leakage prevention device - has pressure responsive valve isolating vacuum pump from intermediate tank |
| CH1679975A CH592554A5 (en) | 1975-12-24 | 1975-12-24 | Liq. tank leakage prevention device - has pressure responsive valve isolating vacuum pump from intermediate tank |
| CH16799/75 | 1975-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1082995A true CA1082995A (en) | 1980-08-05 |
Family
ID=25711264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA262,349A Expired CA1082995A (en) | 1975-10-06 | 1976-09-30 | Leakage protective apparatus for storage containers or the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1082995A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118857584A (en) * | 2024-09-23 | 2024-10-29 | 江苏赛纯科技有限公司 | A methanol fuel cell testing device |
-
1976
- 1976-09-30 CA CA262,349A patent/CA1082995A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118857584A (en) * | 2024-09-23 | 2024-10-29 | 江苏赛纯科技有限公司 | A methanol fuel cell testing device |
| CN118857584B (en) * | 2024-09-23 | 2024-12-20 | 江苏赛纯科技有限公司 | Methanol fuel cell testing device |
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