Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
  • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
  • F17D5/00—Protection or supervision of installations
  • F17D5/02—Preventing, monitoring, or locating loss
  • F17D5/04—Preventing, monitoring, or locating loss by means of a signalling fluid enclosed in a double wall
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L9/00—Rigid pipes
  • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M3/00—Investigating fluid-tightness of structures
  • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
  • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
  • G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
  • G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
  • G01M3/283—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes for double-walled pipes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L2201/00—Special arrangements for pipe couplings
  • F16L2201/30—Detecting leaks

Definitions

• This invention relates to improvements in and to pipelines and :to a method of sensing to check the condition of the pipeline and to enable determination of the conditions of the pipeline.
• the object is achieved by providing a space at at least one cross sectional area of the pipes, disposed between the pipes of the pipeline or within the contiguous sur ⁇ faces of the pipes or within the cross sectional area of one pipe in a manner such that any leakage ' through either the inner or outer pipe or both will cause flow of the fluid into the space, means being provided at manholes or .the like to sense the presence of fluid in this space and thus to be able to determine readily whether either of the pipes of the pipe ⁇ line, or both are faulty.
• the system applies to multiple pipe configuration in general as more than one layer may be required.
• control space as pressur ⁇ ising means between the pipes to avoid inflow into the pipes from the surrounding area or to prevent outflow from the inner pipe to the area.
• the invention can be readily applied by shaping or dis ⁇ torting either the inner or outer pipe, such as by the pipe configuration or by the use of spacers or the like " and such configuration or spacers could for instance be positioned along a lower part of the pipes to give an area at which the fluid can flow and be detected.
• the invention also applies to pipes of the type previously referred to which are formed by winding a strip of any material, preferably plastics, to helical, or as it is
• spiral form which pipes usually have ribs projecting from the base of the strip for the purpose of providing the necessary strength and reinforcement of the pipe, and the invention extends to the use of such ribbed pipes where the ribs can be apertured or arranged to provide the necessary flow into the space between the ribs for sensing any presence of fluid.
• the apertures or configuration is such that any fluid leaking into the space between this pipe and the adjacent pipe of a compound structure will be sensed at a selected point such as at a manhole. It would of .
• the invention can readily be applied in the method known as the "Expanda Pipe” (Trade Mark) system in which a helically wound pipe is expanded or contracted to contact another pipe which may be of the same type or of other construction, and it is envisaged for; instance that a first helically wound pipe could be positioned, preferably during the winding process, into a sewer channel' or the like and expanded to line the channel and after that a second pipe is wound inside of the first pipe and expanded, to engage the first pipe, and if this second pipe is ribbed as described a sealed elongated helical space results in which any leakage which is either inflow or outflow can be detected and measured at a manhole or other area.
• a first helically wound pipe could be positioned, preferably during the winding process, into a sewer channel' or the like and expanded to line the channel and after that a second pipe is wound inside of the first pipe and expanded, to engage the first pipe, and if this second pipe is ribbed as described a sealed elong
• Such a helically wound pipe however can itself be distorted during expansion by for instance placing a spacer such as a rod along preferably the bottom of * the outer pipe so that, during expansion, the expansion is limited adjacent to this spacer to leave a space in which any fluid which leaks into the space can flow to the detection locality.
• the ribs of such a helically wound pipe could be undulated radially or otherwise formed at the extremities to still provide the necessary contact but ensure leakage past the ribs, or a series of spacers can be placed between the pipes to limit expansion of the inner pipe of the "Expanda Pipe" system.
• FIG. 1 is a schematic view showing a double pipeline and showing a sampler connected to the pipeline which is arranged to detect fluid in the space between the inner and outer pipes, which sampler can be arranged to test pressures or type of fluid in the space or to pressurise the space when required, the sampler being arranged at any convenient locality such as a manhole in the case of a sewer line,
• FIG. 2 is a transverse section showing a heavy duty pipe having within it a flow channel, the pipe having a liner,
• FIG. 3 is a- view similar to FIG. 2 . but showing a series of spacers to provide .the cavity between the two pipes,
• FIG. 4 is " a view similar to FIG. 2 but showing a multiple construction comprising outer protective segments supporting a' liner pipe in which is positioned a second liner pipe with a longitudinal spacer at the bottom of the assembly to provide a flow path for any liquid which finds its way to between the two liner pipes,-
• FIG. 5 shows how the sampler " can be positioned in a manhole through which the inner pipe passes, the flow from the space between the pipes being into the manhole,
• FIG. 6 is a fragmentary sectional perspective view showing part of a compound pipe of the ribbed type formed by inter ⁇ connecting two pipes, one being shown of solid form, but providing a cavity between the ribs for the sensing of fluid in the cavities,
• FIG. 7 shows a similar form to FIG. 6 but of an alter ⁇ native ('construction using two helically wound pipes which for instance have been expanded into position, and
• FIG. 8 shows a form similar to FIG. 7 but modified to include a further membrane and perforations to allow flow into the channels defined between the ribs.
• the further membrane can be a solid plate with spaced apertures and the assembly can be reversed so that the plate is on the inside of a multiple wall pipe so formed. --- -
• FIG. 9 is a schematic view similar to FIG. 1 showing a section of a pipeline between two manholes, the space between the inner and outer pipes being sealed at each end of the section and provided with means to fill the space with a fluid to be pressurized.
• the .outer pipe is designated 1 and the inner pipe 2 while the sampler is designated 3 and • the connection to the space is designated-4.
• the sampler 3 can -take various forms and can be used for a number of purposes depending on the monitoring which is to occur of any flow, which appears in the space 5 between the-pipes or for control of the application of pressurising fluid where this is required for any purpose.
• the outer pipe 1 has a longitudinal recess 6 formed in it so that any flow into the space between the outer pipe 1 and the inner pipe 2 is directed to the reces 6 and is then taken to the sampler or could simply be taken to a waste line to give for instance an indication of any leakage which is occurring.
• Fig. 3 shows an embodiment similar to Fig. 2, but showing a series of spacers 7 to space the inner pipe 2 from the outer pipe 1.
• the outer pipe 1 can be made of concrete, and the one or several spacers 7 in Fig. 3 may be formed integrally with the outer pipe 1 , during the fabrication process of the latter.
• FIG. 4 is a view somewhat similar to FIG. 2 but in this case the outer pipe 1 is segmented to form a protective channel and has in it a liner 8 against which the inner pipe 2 is positioned but in this case the inner pipe is distorted by having a spacer 9 at its bottom portion to provide on each side of it the recess for the fluid flowin into the space between the liner 8 and the pipe 2.
• FIG. 5 shows how such an assembly can be positioned in a manhole 10, showing again the outer pipe 1 and the inner pipe 2, the outer pipe terminating on each side at the edges of the manhole 10.
• the manhole in this case collect the fluid flowing into the manhole from the space between the inner pipe 2 and the outer pipe 1. Flow at this area can be taken to a sampler or other device whereby to give an indication of the presence of fluid in the space betwee the two pipes.
• the inner pipe 2 is preferably provided with a removable inspection plate 2A to give access into the pipe 2.
• FI G shows how such an assembly can be positioned in a manhole 10, showing again the outer pipe 1 and the inner pipe 2, the outer pipe terminating on each side at the edges of the manhole 10.
• the manhole in this case collect the fluid flowing into the manhole from the space between the inner pipe 2 and the outer pipe 1. Flow at this area can be taken to a sampler or other device whereby to give an indication of the presence of fluid in the space betwee the two pipes.
• FIG. 6 shows a fragmentary view of a lower section of outer pipe 1 and an inner, pipe 2, the outer pipe 1 being formed by a metal or similar member engaged by the inner pipe 2 which is of the helically formed type comprising a membrane 11 having upstanding ribs 12 with expanded ends 13, showing apertures 14 through the ribs of the helically* ormed strip from which the pipe is formed to allo flow longitudinally through the space formed between the base 11 of the' strip on which the ribs 12 are formed and the surface of the pipe 1 contacted by the expanded ends 13 of the ribs 12.
• FIG. 7 shows a modification of the form shown in FIG. 6 but in this the apertures are replaced by undulations 15 at the ends of the ribs 12, the undulations being shown only on the inner pipe 2, the outer pipe 1 in ' this case also being shown as formed by a helically wound strip.
• FIG. 8 shows a modification of FIG. 7 in which a membrane 17 extends over the outer pipe 12 to form a further series of channels between the ribs but with apertures through the membrane 17 and through the base of the strip 15 to allow draining into or out of the channels between the ribs.
• the assembly shown could be reversed to cause the membrane 17 to define the inner surface of the pipe.
• the membrane 11 of the pipe 1 also has apertures 19.
• FIG. 9 shows a pipeline similar to FIG. 1 extending between two manholes where the outer and inner pipe end, and at each end of the pipeline the space 5 between the outer and the inner pipe is closed by seals 20.
• the space 5 can be filled with fluid, e.g. water, by means of a* valve 21 and the water pressure can be read at a gauge 22 situated in the manhole and connected to the space 5.
• fluid e.g. water
• the liner to be of spirally wound ribbed plastics profile ("RIB LOC" - trademark) to represent the actual liquid carrier.
• the bottom of the protective pipe to be factory- -equipped with a checkable and cleanable channel which serves as a collecting and drainage channel for any waste- water exfiltrating through leaks in the product pipe, or groundwater infiltrating through leaks in the protective pipe.
• the outside diameter of the liner to be smaller than the inside diameter of the protective pipe, ' and the annular space and the collecting and drainage channel can be formed by spacers.
• the number and dimensions of the spacers on the inner wall of the pipe to depend on the pipe diameter. 8 .
• the spacers to be fitted to the inside of the pro ⁇ tective pipe at the factory and to be continuous or inter ⁇ mittent.
• an "Expanda Pipe” (TM) to be inserted as a liner in the pipe tract requiring rehabilitation, and this liner takes over the function of the protective pipe and acts as a seal agains surrounding groundwater and fulfils a bearing function in relation to all acting external loads.
• TM "Expanda Pipe”
• this liner takes over the function of the protective pipe and acts as a seal agains surrounding groundwater and fulfils a bearing function in relation to all acting external loads.
• a second "Expanda” liner to be inserted as the product pipe for the collection and drainage of wastewater exfiltratin through the product pipe, or of groundwater infiltrating through the protective liner.
• the liner provides protection for the outside pro ⁇ tective pipe (e.g. corrosion protection for concrete pipes) and, there is no need in the sewerage sector for factory- made compound pipes e.g. concrete or reinforced concrete pipes with integral plastic linings and the attendant jointing problems .
• the protective pipe need fulfil only static functions, the liner taking care of .physical, chemical, biochemical and biological demands generated by the medium.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Sewage (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=3773207

Family Applications (1)

Country Status (2)

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Family Cites Families (8)

• 1989
  • 1989-07-08 EP EP19890907745 patent/EP0383864A1/de not_active Ceased
  • 1989-07-08 WO PCT/EP1989/000791 patent/WO1990000698A1/en not_active Ceased

Non-Patent Citations (1)

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