WO2009156729A1 - Système de support pour joint mécanique - Google Patents

Système de support pour joint mécanique Download PDF

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Publication number
WO2009156729A1
WO2009156729A1 PCT/GB2009/001590 GB2009001590W WO2009156729A1 WO 2009156729 A1 WO2009156729 A1 WO 2009156729A1 GB 2009001590 W GB2009001590 W GB 2009001590W WO 2009156729 A1 WO2009156729 A1 WO 2009156729A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
support system
seal support
vessel
seal
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.)
Ceased
Application number
PCT/GB2009/001590
Other languages
English (en)
Inventor
John Thomas Bright
Alan James Roddis
Stephen Martin Shaw
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AES Engineering Ltd
Original Assignee
AES Engineering Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AES Engineering Ltd filed Critical AES Engineering Ltd
Publication of WO2009156729A1 publication Critical patent/WO2009156729A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/12—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means attached at their periphery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3151—Accumulator separating means having flexible separating means the flexible separating means being diaphragms or membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • F15B2201/515—Position detection for separating means

Definitions

  • This invention relates to seal support systems and especially systems, which are used with mechanical seals for the containment of process fluid.
  • a seal support system typically comprises of a pressure vessel or tank (vessel), which generally contains a volume of fluid.
  • the vessel is piped to a sealing device on a pump, mixer or item of rotating equipment.
  • a return pipe is lead back to the vessel from the sealing device, hence closing the "loop". This allows the fluid, contained in the vessel, to enter and exit the sealing device.
  • a seal support system is employed with a mechanical seal with two or more sets of seal faces, more commonly referred to as a double or dual seal.
  • the fluid within the vessel is generally chosen so that it lubricates and cools the components within the sealing device, whilst being compatible with the process fluid.
  • the industry term for the fluid contained within the vessel, is Barrier or Buffer fluid.
  • seal support system It is not uncommon for the seal support system to have other items of equipment, sited around the vessel, to permit pressure being applied to the barrier / buffer fluid, or to allow additional cooling or fluid circulation around the seal.
  • the sealing device sited on the item of rotating equipment is a mechanical seal comprising of a rotating member, which is secured to a shaft, and a stationary member which is secured to a housing.
  • seal support systems may have to operate in a variety of ambient temperatures due climate effects, as a result of geography or even time of day.
  • the effect of high temperature fluctuations on the barrier fluid causes volume variation which results in changes in the system pressure constant between the barrier and process fluid.
  • the seal can accommodate pressure fluctuations in the barrier fluid as a result of barrier temperature without changing the pressure differential constant between the reference pressure of the process chamber and the barrier fluid pressure.
  • the gas, used to pressurise the accumulator is not in direct contact with the barrier fluid media therefore can not aerate said fluid.
  • a method of automatically detecting the barrier fluid level in the vessel is desirable, specifically if said detection can be used to trigger an alarm in low/high barrier ⁇ 'jid level conditions.
  • Bladder accumulators are frequently employed in industry as they are generally a lower cost solution than a piston accumulator.
  • seal support system for use with a sealing device employed to seal a piece of industrial equipment.
  • Said seal support system is characterised by - an isolator connected to the seal chamber by suitable piping means
  • an accumulator or pressure vessel connected to the differential pressure valve wherein, said vessel contains a fluid and is connected to the sealing device in a closed loop system and said differential pressure valve is connected to a suitable pressure source.
  • the first embodiment is that the seal support system of the invention is a pressure tracking means in that the system tracks the process fluid pressure and automatically maintains the barrier fluid pressure at a constant pressure differential, preferably higher, over the process fluid pressure, specifically when the barrier fluid is intolerable to direct gas pressurisation.
  • a constant pressure differential preferably higher
  • An example of such an application is an oil based barrier fluid.
  • the differential valve has a venting means so that indirect increases in barrier fluid pressure, separate to the tracking means, can be automatically vented so to maintain said constant pressure differential between the process fluid and barrier fluid.
  • a venting means so that indirect increases in barrier fluid pressure, separate to the tracking means, can be automatically vented so to maintain said constant pressure differential between the process fluid and barrier fluid.
  • the barrier fluid within the barrier fluid vessel, expands due to changes in temperature and said expansion creates an undesirable increase in barrier fluid pressure.
  • the seal support system of the invention has a vessel containing fluid. Inside the vessel is a floating member preferably of a material and/or construction which is buoyant in a fluid.
  • said floating member has one or more magnet or magnetically attractable members on the outer most surface substantially adjacent to the inner most surface of the vessel.
  • the floating member is an annular flat plate with maximum surface area contact with the fluid.
  • the vessel is made of a material which is substantially not magnetic.
  • a preferable non-magnetic vessel material is stainless steel.
  • a level indicator in the form of a sliding magnet which is attracted and hence corresponds with the floating member.
  • said level indicator has an upper and lower limit switch thereby when, for example, a low fluid level condition is reached the system provides a signal for more fluid to be added.
  • the vessel fluid level can be increased by a suitable manual re-fill means, such as a hand pump connected to a fluid reservoir.
  • a suitable manual re-fill means such as a hand pump connected to a fluid reservoir.
  • the signal from the limit switch automatically activates the fluid re-fill operation without any human intervention.
  • the second embodiment is that the seal support system of the invention that has a vessel containing fluid, the fluid level of the vessel is automatically monitored by a magnetic level indicator which is substantially out of contact with the fluid.
  • the floating member has a ring construction sited inside the vessel.
  • Said ring has an inner and outer diameter and is characterised in that the radial clearance between the outer diameter of said ring and inner diameter of said vessel is a clearance fit thereby allowing fluid to pass from one longitudinal side of the ring to another.
  • said radial clearance is relatively small.
  • the vessel contains a cooling coil, which is considered as a spiral tube, the assembly of said cooling coil has an effective outer diameter, which is substantially smaller than the inner most diameter of the ring thereby permitting the ring to longitudinally slide inside the vessel without being constrained by the cooling coil.
  • the accumulator charges the fluid in the vessel to the desired pressure.
  • Said accumulator is preferably connected yet independent of the vessel and of a bladder construction.
  • seal support system for use with a sealing device employed to seal a piece of industrial equipment.
  • Said seal support system is characterised by
  • said vessels contain fluid and are connected to the sealing devices in a closed loop system on two or more items of industrial equipment.
  • Said differential pressure valves are connected to a suitable pressure source.
  • the third embodiment is that the seal support system of the invention incorporates multiple pressure tracking means for use with multiple items of industrial equipment.
  • the system tracks the process fluid pressure of two or more items of equipment and automatically maintains the barrier fluid pressure at a constant pressure differential, preferably higher, over the respective process fluid pressures specifically when the barrier fluid is intolerable to direct gas pressurisation.
  • An example of such an application is an oil based barrier fluid.
  • the respective vessels in the seal support system of the invention have a fluid separating diaphragm device, permitting different types of fluid in the upper and lower sections of the vessel.
  • the respective vessels in the seal support system of the invention have level indicators so that when an appropriate level condition is sensed, the system provides a signal for more fluid to be added.
  • the vessel fluid level can be increased by a suitable manual re-fill means, such as a hand pump connected to a fluid reservoir.
  • a suitable manual re-fill means such as a hand pump connected to a fluid reservoir.
  • the signal from the limit switch automatically activates the fluid re-fill operation without any human intervention.
  • the multi- application re-fill operation is activated from a central reservoir re-fill system.
  • the pressure within the respective vessels is regulated by an appropriate venting means so that an over-pressurisation condition of the barrier fluid can not be encountered.
  • Figure 1 is a schematic view of a prior art Plan 53C seal support system as found in the international standard API682 Ed.3
  • Figure 2 is a schematic view of the system of the invention
  • Figure 3 corresponds to Figure 2 and is a schematic view of the system of the invention with a piston type accumulator.
  • Figure 4 corresponds to Figure 2 and is a schematic view of the system of the invention with a bladder type accumulator.
  • Figure 5 is a schematic view of multi-application seal support with an automatic re-fill system
  • Figure 6 corresponds to Figure 5 and is a schematic view of multi- application seal support with an automatic single re-fill system with a duty and stand-by motor/pump system
  • FIG 1 is a schematic view of a prior art Plan 53C seal support system 10 as illustrated in the international standard API682 Ed.3 From Figure 1 , a item of industrial equipment such as a pump 11 is sealed with a sealing device such as a mechanical seal 12.
  • the pump 11 is processing a fluid 13 herewith called process fluid typically operating at a fluctuating pressure.
  • a communication path 14 is taken from the seal chamber 15 to one side of an accumulator 16.
  • the barrier fluid in the seal 12 and/or seal support system 18 is connected to the other side of the accumulator.
  • Figure 1 and the above description describes a typical piston type accumulator. As the pressure fluctuates in the process chamber 15, the barrier pressure in the seal 12 fluctuates also. The result is that the pressure differential between the process chamber 15 and seal chamber 12 can be kept to a desired level.
  • Figure 2 is a schematic view of the seal support system 20 of the invention.
  • a item of industrial equipment such as a pump 21 is sealed with a sealing device such as a mechanical seal 22.
  • the pump 21 is processing a fluid 23 herewith called process fluid typically operating at a fluctuating pressure.
  • a reference communication path 24 is taken from the seal chamber 25 to an isolator 26.
  • the isolator 26 is connected to a differential pressure valve 27.
  • the purpose of the isolator 26 is to transmit reference pressure to the differential pressure valve 27.
  • the process fluid 23 reference pressure is taken by the isolator 26 and fed into the differential pressure valve 27, which is also connected to a gas supply source 28 such as nitrogen.
  • the differential pressure valve 27 creates the desired barrier pressure and charges an accumulator 29 with said desired pressure.
  • the accumulator 29 contains barrier fluid used to lubricate and cool the mechanical seal 22.
  • the barrier pressure in the seal 22 fluctuates also.
  • the result is that the pressure differential between the process chamber 25 and seal chamber 22 can be kept to a desired level.
  • the system of the invention does not have the gas supply 28 in direct contact with the barrier media, it can be used in barrier fluids such as oil, which overcomes gas absortion of the barrier fluid.
  • the design of the invention is also advantageous as it has no moving piston accumulator and/or elastomeric parts in contact with the process fluid.
  • Figure 2 also illustrates a re-fill device 31 connected to a non-return valve 32. If the level in the barrier fluid reduces, the re-fill device can be activated to apply additional barrier fluid into the seal system 30.
  • Figure 3 corresponds to Figure 2 and is a schematic view of the system of the invention 40 with a piston type accumulator 41.
  • FIG. 3 operates in a similar manner to as previously described other than the accumulator 41 has a piston 42 which moves longitudinally inside the accumulator 41 depending on the pressure applied by the differential pressure switch 43.
  • a magnetic level switch 44 mounted on the outer most surface of the accumulator senses the position of the accumulator so to automatically determine the level of fluid in the accumulator 41. Once the barrier fluid level in the accumulator 41 reaches a critical level, the level switch 44 may automatically activate the refill device 46 to add further barrier fluid into the seal system 45.
  • Figure 4 corresponds to Figure 2 and is a schematic view of the system of the invention 50 with a diaphragm type accumulator 51.
  • the system incorporates a diaphragm 59, preferably secured between the upper and lower parts of the accumulator 51.
  • the system 50 incorporates a level switch 52 on the gas side 57 of the accumulator 51.
  • the level switch is mounted on the outer most surfaces of the accumulator 51 and is activated by a floating member 54.
  • Said floating member is buoyant on the fluid 58 and has a magnet or magnetically attractive outer most surface 55 which correlates with the level switch 52.
  • the level switch 52 sends a signal to the re-fill device 56 so that additional barrier fluid 53 can be added.
  • This invention of the device is particularly advantageous because the barrier fluid 53 is not in contact with the gas 57 and therefore has all the advantages of bladder accumulators but also allows direct monitoring of the barrier fluid level.
  • Figure 5 is a schematic view of multi-application seal support with an automatic re-fill system 60.
  • a central, common re-fill system 66 is employed to re-fill one or more sealing applications 62 and 63.
  • the level switch 61 is preferably electrically connected 64 to the pump/motor 65 on the forced circulation re-fill device 66.
  • the level switch 61 is also preferably electrically connected 67 to a electrically activated ball valve 68.
  • the level switch 61 on the offending vessel 70 activates/opens the appropriate ball valve 68 and activates the forces circulation device 66.
  • the non-return valve 69 prevents any loss of fluid or pressure from the sealing system 70.
  • the barrier fluid, from the automatic re-fill device 66 passes through the open ball valve 68 and opens the non-return valve 69 adding fluid into the vessel 70.
  • the barrier fluid pressure from the re-fill device 66 must be greater than the barrier fluid pressure in the vessel 70. This over pressure is vented by the integral vent 71 on the pressure differential switch 72.
  • the level switch 61 sends a signal to close the ball valve 68 and deactivate the motor/pump 65 on the re-fill device 66.
  • the seal support system 60 of the invention then continues to track the process pressure 75 and adjust the barrier fluid 76 pressure accordingly as previously described.
  • Figure 6 corresponds to Figure 5 and is a schematic view of multi- application seal support 90 with an automatic single re-fill system 91.
  • the system 91 comprises of a duty motor/pump 92 and a stand-by motor/pump 93.
  • a duty motor/pump 92 and a stand-by motor/pump 93.
  • two circulation pumps are deemed necessary to eliminate the likelihood that a single motor/pump will not activate when required to do so.
  • the system of the invention in Figure 6 accommodates such an occasion by providing two pumps/motors 94 and 95 which can be linked so that if one motor fails to start, the other motor is activated to perform the required task in hand.
  • seal support system of the invention can employ any other suitable actuation means such as air or hydraulics.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

La présente invention concerne un système de support pour joint qui accompagne la pression des fluides de traitement d'un ou plusieurs éléments d'équipement, et qui conserve automatiquement à la pression du fluide barrière un différentiel de pression constant, de préférence supérieur, par rapport aux différentes pressions des fluides de traitement, particulièrement quand le fluide barrière ne supporte pas la pressurisation directe par des gaz. Typiquement, l'invention convient à un fluide barrière à base d'huile. Le système peut également s'employer dans le cas d'organes d'accompagnement de pressions multiples destinés à plusieurs éléments d'équipement industriel.
PCT/GB2009/001590 2008-06-24 2009-06-24 Système de support pour joint mécanique Ceased WO2009156729A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0811562A GB0811562D0 (en) 2008-06-24 2008-06-24 Mechanical seal support system
GB0811562.8 2008-06-24

Publications (1)

Publication Number Publication Date
WO2009156729A1 true WO2009156729A1 (fr) 2009-12-30

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PCT/GB2009/001590 Ceased WO2009156729A1 (fr) 2008-06-24 2009-06-24 Système de support pour joint mécanique

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GB (1) GB0811562D0 (fr)
WO (1) WO2009156729A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011131952A1 (fr) * 2010-04-23 2011-10-27 Aes Engineering Ltd. Vanne de suivi de pression de système de support de joint d'étanchéité
GB2500794A (en) * 2012-03-16 2013-10-02 Aes Eng Ltd A mechanical seal support system
US8888105B1 (en) 2013-05-29 2014-11-18 Stephen J. Andrews Mechanical seal system
WO2014181074A3 (fr) * 2013-05-09 2014-12-31 A.E.S. Engineering Ltd Système de support de joint mécanique
GB2519935A (en) * 2012-08-29 2015-05-13 Aes Eng Ltd Bladder accumulator volume indicating device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3547306A (en) * 1968-09-03 1970-12-15 Henry R Natterstad Floating fluid barrier
GB1234148A (fr) * 1969-11-24 1971-06-03
AU5754973A (en) * 1972-06-29 1975-01-09 Borgwarner Corporation Cooling pump system for mechanical seals
US4730092A (en) * 1985-12-20 1988-03-08 Siemens Aktiengesellschaft Hydraulic driving device for an electric pressurized-gas switch
US5769427A (en) * 1995-09-13 1998-06-23 Chesterton International Company Dual seal with clean barrier fluid and dynamic pressure control
US6478051B1 (en) * 1998-11-25 2002-11-12 Continental Teves Ag & Co., Ohg Pressure means storage device
US20030136123A1 (en) * 2002-01-24 2003-07-24 Carl Seguin Variable volume reservoir
WO2004001259A1 (fr) * 2002-06-25 2003-12-31 Termoelettronica S.P.A. Dispositif electronique multifonctions destine a un procede de commande et de gestion de garniture mecanique mis en oeuvre part ledit dispositif
US7234490B2 (en) * 2003-03-11 2007-06-26 Hydac Technology Gmbh. Hydraulic accumulator comprising a position indicator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3547306A (en) * 1968-09-03 1970-12-15 Henry R Natterstad Floating fluid barrier
GB1234148A (fr) * 1969-11-24 1971-06-03
AU5754973A (en) * 1972-06-29 1975-01-09 Borgwarner Corporation Cooling pump system for mechanical seals
US4730092A (en) * 1985-12-20 1988-03-08 Siemens Aktiengesellschaft Hydraulic driving device for an electric pressurized-gas switch
US5769427A (en) * 1995-09-13 1998-06-23 Chesterton International Company Dual seal with clean barrier fluid and dynamic pressure control
US6478051B1 (en) * 1998-11-25 2002-11-12 Continental Teves Ag & Co., Ohg Pressure means storage device
US20030136123A1 (en) * 2002-01-24 2003-07-24 Carl Seguin Variable volume reservoir
WO2004001259A1 (fr) * 2002-06-25 2003-12-31 Termoelettronica S.P.A. Dispositif electronique multifonctions destine a un procede de commande et de gestion de garniture mecanique mis en oeuvre part ledit dispositif
US7234490B2 (en) * 2003-03-11 2007-06-26 Hydac Technology Gmbh. Hydraulic accumulator comprising a position indicator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011131952A1 (fr) * 2010-04-23 2011-10-27 Aes Engineering Ltd. Vanne de suivi de pression de système de support de joint d'étanchéité
GB2493870A (en) * 2010-04-23 2013-02-20 Aes Eng Ltd Seal support system pressure tracking valve
US9098094B2 (en) 2010-04-23 2015-08-04 Aes Engineering Ltd. Seal support system pressure tracking value
GB2493870B (en) * 2010-04-23 2017-12-20 Aes Eng Ltd Seal support system pressure tracking valve
GB2500794A (en) * 2012-03-16 2013-10-02 Aes Eng Ltd A mechanical seal support system
GB2519935A (en) * 2012-08-29 2015-05-13 Aes Eng Ltd Bladder accumulator volume indicating device
GB2519935B (en) * 2012-08-29 2016-03-23 Aes Eng Ltd Bladder accumulator volume indicating device
WO2014181074A3 (fr) * 2013-05-09 2014-12-31 A.E.S. Engineering Ltd Système de support de joint mécanique
CN105378352A (zh) * 2013-05-09 2016-03-02 Aes工程有限公司 机械密封辅助系统
CN105378352B (zh) * 2013-05-09 2019-06-14 Aes工程有限公司 机械密封辅助系统
US8888105B1 (en) 2013-05-29 2014-11-18 Stephen J. Andrews Mechanical seal system

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Publication number Publication date
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