GB2517132A - Barrier System for Mechanical Seal - Google Patents

Barrier System for Mechanical Seal Download PDF

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Publication number
GB2517132A
GB2517132A GB1310427.8A GB201310427A GB2517132A GB 2517132 A GB2517132 A GB 2517132A GB 201310427 A GB201310427 A GB 201310427A GB 2517132 A GB2517132 A GB 2517132A
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GB
United Kingdom
Prior art keywords
pressure
barrier
fluid
monitoring
volume
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.)
Granted
Application number
GB1310427.8A
Other versions
GB2517132B (en
GB201310427D0 (en
Inventor
Andrew John Stoney
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
Priority to GB1310427.8A priority Critical patent/GB2517132B/en
Publication of GB201310427D0 publication Critical patent/GB201310427D0/en
Priority to US14/301,671 priority patent/US11079021B2/en
Publication of GB2517132A publication Critical patent/GB2517132A/en
Application granted granted Critical
Publication of GB2517132B publication Critical patent/GB2517132B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • 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
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F15B1/033—Installations or systems with accumulators having accumulator charging devices with electrical control means
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3464—Mounting of the seal
    • F16J15/348—Pre-assembled seals, e.g. cartridge seals
    • F16J15/3484—Tandem seals
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • 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
    • F15B2201/3152—Accumulator separating means having flexible separating means the flexible separating means being bladders
    • 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
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve 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
    • F15B2201/50—Monitoring, detection and testing means for accumulators
    • 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
    • F15B2201/51—Pressure detection

Abstract

A barrier system for a dual mechanical seal is provided. The system comprises means for controlling barrier fluid pressure PBarrier relative to product pressure PRef. The pressure control means comprises means 11, 13, 15 for monitoring the volume of barrier fluid in thesystem and means 5 for supplying additional fluid to the system to maintain the volume VBarrier within a desired range. The system further comprises means 3 for maintaining the barrier fluid pressure at a pre-determined pressure PBias above product pressure.

Description

Barrier System for Mechanical Seal
Field of Invention
This invention relates to mechanical seals and more specifically to barrier systems for dual mechanical seals.
Background to the Invention
The operation of a dual mechanical seal typically requires a system to manage the fluid provided to the space between the pairs of mechanical seal faces. It is often desirable to provide a fluid that is pressurised so that the fluid between the pails of mechanical seal faces is at a greater pressure than that of the product being sealed.
Such a system is commonly referred to as a barrier system. Since the pressure of the product is less than that of the system, fluid will always flow from the mechanical seal into the product hence creating a barrier to potentially hazardous product from contaminating the system fluid or the atmosphere.
An example of a barrier system is one incorporating a bladder accumulator that is used to both pressurise the barrier fluid and to hold a volume of barrier fluid for consumption by the mechanical seal. Such a system is commonly referred to as an API Plan 53B system.
A typical API Plan 53B system will be pre-charged with gas to a pre-determined pressure. Subsequently the system will be further charged by a volume of liquid which further raises the pressure in the system. Typically the volume of liquid is of the order of 10 to 20% of the available volume within the accumulator.
During normal operation, liquid in the system is consumed by the mechanical seal. This reduction in fluid volume results in a proportional reduction in the total system pressure. This pressure reduction is used to trigger an indication that the fluid in system requires replenishment.
The system described above has a number of limitations:- 1. In order to maintain a positive pressure differential between barrier fluid and product, the system pressure must be set greater than the maximum possible product pressure. This means that the mechanical seal will be operating most of the time with a higher pressure differential than geneially iequiied. Operating the mechanical seal with an elevated pressure differential is detrimental to the seal and affects its reliability.
2. The fixed gas pie-charge results in pressuie variation within the system when ambient tempeiatures vary. This pressure variation has the same detrimental effect as in 1 above. In addition the control system used to monitor the fluid level becomes more complex. Typically this requires the addition of temperature measurement and complex control algorithms to relate pressure and temperature variation to fluid consumption.
3. The volume of usable liquid in the system is limited by the acceptable pressure variations of the mechanical seal and those of the control system. Hence the system requires greater frequency of fluid replenishment then would otherwise be necessary.
Statements of the Invention
According to the present invention there is provided a barrier system for a dual mechanical seal, the system comprising means for controlling barrier fluid pressure relative to product pressure, said pressure control means comprising means for monitoring the volume of barrier fluid in the system and for supplying additional fluid to the system to maintain the volume within a desired range, and means for maintaining the barrier fluid pressure at a pre-determined pressure above product pressure.
Preferably the system includes a bladder accumulator.
Preferably the system includes means for supplying pressurised gas to said bladder accumulator and means for controlling the pressure of the gas supplied thereby to maintain the bladder fluid pressure at a pre-determined pressure above product pressure.
Preferably the control means includes a pressure tracking device located, in use, between a source of pressurised gas and the bladder accumulator.
Preferably the volume of barrier fluid in the system is monitored by a flow meter located, in use, between a source of barrier fluid and the bladder accumulator.
More preferably the volume of barrier fluid is additionally monitored by means for monitoring the consumption of fluid by the mechanical seal. Such additional monitoring means may comprise a flow meter for monitoring flow of barrier fluid to the seal and a flow meter for monitoring flow of barrier fluid from the seal.
The present invention further provides a method for maintaining barrier fluid pressure at pre-determined pressure above product pressure in a barrier system of a dual mechanical seal, the method comprising monitoring the volume of barrier fluid in system, supplying additional fluid to the system to maintain the volume within a desired range, monitoring the barrier fluid pressure and adjusting it where necessary to achieve said pre-determined pressure above said product pressure.
A system in accordance with the present invention will automatically adjust the system pressure relative to the changing product pressures such that the pressure differential (barrier to product) is always optimised for maximum mechanical seal reliability. The system will prevent ambient temperature variation affecting operating pressure differential. Furthermore the full fluid volume capability of the accumulator may be utilised.
Brief Description of the Drawings
The accompanying drawings are as follows:- 1. Figure 1 illustrates diagrammatically the system for providing barrier fluid to a dual mechanical seal; 2. Figures 2 to 6 show various stages in the installation operation of a barrier system in accordance with the present invention.
Detailed Description of the Invention
The present invention will now be described, by way of example only, with reference to the accompanying drawings.
Referring to Figure 1 of the accompanying drawings, a system for supplying barrier fluid to a dual mechanical seal comprises a bladder accumulator 1 to which is connected a pressure tracking device 3, there being located between device 3 and accumulator 1 an adjustable valve 5. Pressure tracking device 3 is in turn connected to a source of pressurized nitrogen and to a location at which the pressure of barrier fluid in the system (the reference pressure) can suitably be determined. This position could be a vessel chamber of the seal.
Connected to the pressure tracking device 3 is a silencer 9. Also connected to bladder accumulator 1 is a flow meter 11 which measures liquid flow to and from the bladder accumulator. Barrier fluid flow through flow meter 11 can take place to the seal vessel chamber via flow meters 13 and 15. Barrier fluid can be supplied to the system via feed 17 and system vents are provided at 19 and 21 and the system drains at 23 and 25. They can also be provided with one or both of pressure indicator 27 and electronic indicator 29 to control the system.
Referring to Figures 2 to 5 of the accompanying drawings, there is illustrated various stages in the operation of a system such as that shown in Figure 1. The system is shown in simplified form with the bladder accumulator 1, pressure tracking device 3, valve Sand flow meters 11, 13 and 15. As shown in Figure 2, the system pressure (PBaer) is equal to the product pressure (PRef) and the bias pressure (P612).
Referring to Figure 2, there is illustrated the position when the system is initially commissioned. The supply gas is attached and the system pressure (PBarrjer) sets' itself. When set with all other inputs at zero pressure, the seal loop is pressurised (PBarrjer) and it equals biased pressure (PBrj, the product pressure (PRoI) being at zero. In this case, (PRef) is assumed to be 2 barg (30 psig).
Once the pressure is set, the bladder accumulator gas pressure is locked so that the volume of gas remains constant. Barrier fluid can then be pumped in to the fluid circuit so that the volume of barrier fluid (VBarrjer) is as desired. Typically, the volume of barrier fluid does not exceed 80% of the available volume of the accumulator.
Once the barrier fluid volume is set, the bladder accumulator gas pressure is allowed to equalise back to the set bias pressure (pressure having being increased due to the reduced gas volume).
The system tracks" input pressure (PRq) maintaining a positive pressure differential such that the barrier pressure (PBarrjer) equals the reference pressure (PRef) plus the bias pressure (PBaj.
The system will continue to operate in this manner as the volume of barrier fluid is consumed by the mechanical seal being serviced by the system.
Figure 4 shows the position when there is a normal" amount of fluid in the system, the product pressure (PRef) is lUbarg and the (PBarrjer) pressure is 12 barg.
In Figure 5 the amount of barrier fluid has reduced (VBardeo) due to the loss of barrier fluid from the seal. During this process (FBarrjer) is maintained at 12 barg.
Figure 6 shows the position after the additional fluid has been supplied to the bladder accumulator. During this process the SmartTrack pressure tracking device continues to regulate the pressure in the system by allowing excess gas to vent to atmosphere as the volume of liquid increases.
In order for the system to be effectively controlled, the volume in the system (VBarrier) needs to be known and monitored. This is achieved by the use of three flow meters that log flow of liquid into the system and consumption of fluid by the mechanical seal. In other embodiments of the present invention this monitoring of the volume of liquid can achieved by other means.

Claims (10)

  1. Claims 1. A barrier system for a dual mechanical seal, the system comprising means for controlling barrier fluid pressure relative to product pressure, said pressure control means comprising means for monitoring the volume of barrier tluid in the system and for supplying additional fluid to the system to maintain the volume within a desired range, and means for maintaining the barrier fluid pressure at a pre-determined pressure above product pressure.
  2. 2. A system according to Claim 1, wherein the system includes a bladder accumulator.
  3. 3. A system according Claim 2, wherein the system includes means for supplying pressurised gas to said bladder accumulator and means for controlling the pressure of the gas supplied thereby to maintain the barrier fluid pressure at a pre-determined pressure above product pressure.
  4. 4. A system according to Claim 3, wherein said control means includes a pressure tracking device located, in use, between a source of pressurised gas and the bladder accumulator.
  5. 5. A system according to any of the preceding claims, wherein the volume of barrier fluid in the system is monitored by a flow meter located, in use, between a source of barrier fluid and the bladder accumulator.
  6. 6. A system according to Claim 5, wherein the volume of barrier fluid is additionally monitored by means for monitoring the consumption of fluid by the mechanical seal.
  7. 7. A system according to Claim 6, wherein the additional monitoring means comprise a flow meter for monitoring flow of barrier fluid to the seal and a flow meter for monitoring flow of barrier fluid from the seal.
  8. 8. A barrier system according to Claim 1 and substantially as herein described.
  9. 9. A barrier system substantially as described with reference to the accompanying drawings.
  10. 10. A method of maintaining barrier fluid pressure at a pre-determined pressure above product pressure in a barrier system of a dual mechanical seal, the method comprising monitoring the volume of barrier fluid in the system, supplying additional fluid to the system as required, monitoring the barrier tluid pressure and adjusting it where necessary to achieve said pre-determined pressure above product pressure.AMENDMENTS TO THE CLAIMS HAVE 5 AS FOLLOWS: Claims 1. A barrier system for a dual mechanical seal, the system comprising means for controlling barrier fluid pressure relative to product pressure, said pressure control means comprising means for monitoring the volume of barrier fluid in the system and for supplying additional fluid to the system to maintain the volume within a desired range, and means for maintaining the barrier fluid pressure at a pre-determined pressure above product pressure.2. A system according to Claim 1, wherein the system includes a bladder accumulator.3. A system according Claim 2, wherein the system includes means for supplying pressurised gas to said bladder accumulator and means for controlling the pressure of the gas supplied thereby to maintain the barrier -i-fluid pressure at a pre-determined pressure above product pressure. (04. A system according to Claim 3, wherein said control means includes a c pressure tracking device located, in use, between a source of pressurised gas and the bladder accumulator.5. A system according to any of the preceding claims, wherein the volume of barrier fluid in the system is monitored by a flow meter located, in use, between a source of barrier fluid and the bladder accumulator.6. A system according to Claim 5, wherein the volume of bairier fluid is additionally monitored by means for monitoring the consumption of fluid by the mechanical seal.7. A system according to Claim 6, wherein the additional monitoring means comprise a flow meter for monitoring flow of barrier fluid to the seal and a flow meter for monitoring flow of barrier fluid from the seal.8. A barrier system according to Claim 1 and substantially as herein described.9. A barrier system substantially as described with reference to the accompanying drawings.10. A method of maintaining barrier fluid pressure at a pre-determined pressure above product pressure in a barrier system of a dual mechanical seal, the method comprising monitoring the volume of barrier fluid in the system, supplying additional fluid to the system as required, monitoring the barrier fluid pressure and adjusting it where necessary to achieve said pre-determined pressure above product pressure.CD r
GB1310427.8A 2013-06-12 2013-06-12 Barrier System for Mechanical Seal Active GB2517132B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1310427.8A GB2517132B (en) 2013-06-12 2013-06-12 Barrier System for Mechanical Seal
US14/301,671 US11079021B2 (en) 2013-06-12 2014-06-11 Barrier system for mechanical seal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1310427.8A GB2517132B (en) 2013-06-12 2013-06-12 Barrier System for Mechanical Seal

Publications (3)

Publication Number Publication Date
GB201310427D0 GB201310427D0 (en) 2013-07-24
GB2517132A true GB2517132A (en) 2015-02-18
GB2517132B GB2517132B (en) 2015-11-11

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GB1310427.8A Active GB2517132B (en) 2013-06-12 2013-06-12 Barrier System for Mechanical Seal

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GB (1) GB2517132B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2525297A (en) * 2014-02-28 2015-10-21 Aes Eng Ltd Support systems for mechanical seals

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GB201304435D0 (en) * 2013-03-12 2013-04-24 Aes Eng Ltd Mechanical Seal Support System
GB2546790A (en) * 2016-01-29 2017-08-02 Ge Oil & Gas Uk Ltd Hydraulic accumulator monitoring system

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GB2405906A (en) * 2003-09-12 2005-03-16 Aesseal Plc Liquid ring vacuum pump with automatically maintained level of barrier fluid
GB2410987A (en) * 2004-02-10 2005-08-17 Aesseal Plc A mechanical seal fluid support system
GB2514447A (en) * 2013-03-12 2014-11-26 A E S Engineering Ltd Mechanical seal support system

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US5769427A (en) * 1995-09-13 1998-06-23 Chesterton International Company Dual seal with clean barrier fluid and dynamic pressure control
US5632892A (en) * 1995-10-19 1997-05-27 Mechanical Equipment Company, Inc. Portable reverse osmosis water purification plant
GB0004239D0 (en) * 2000-02-24 2000-04-12 Crane John Uk Ltd Seal assemblies
JP4857766B2 (en) * 2005-12-28 2012-01-18 株式会社日立プラントテクノロジー Centrifugal compressor and dry gas seal system used therefor
US8146354B2 (en) * 2009-06-29 2012-04-03 Lightsail Energy, Inc. Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange
NO332973B1 (en) * 2010-06-22 2013-02-11 Vetco Gray Scandinavia As Pressure control system for motor and pump barrier fluids with differential pressure control
GB201215375D0 (en) * 2012-08-29 2012-10-10 Aes Eng Ltd Bladder accumulator volume indicating device
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JP6084300B2 (en) * 2012-11-07 2017-02-22 トランスオーシャン セドコ フォレックス ベンチャーズ リミテッド Underwater energy storage for BOP

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Publication number Priority date Publication date Assignee Title
GB2405906A (en) * 2003-09-12 2005-03-16 Aesseal Plc Liquid ring vacuum pump with automatically maintained level of barrier fluid
GB2410987A (en) * 2004-02-10 2005-08-17 Aesseal Plc A mechanical seal fluid support system
GB2514447A (en) * 2013-03-12 2014-11-26 A E S Engineering Ltd Mechanical seal support system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2525297A (en) * 2014-02-28 2015-10-21 Aes Eng Ltd Support systems for mechanical seals
GB2525297B (en) * 2014-02-28 2017-12-27 Aes Eng Ltd Support systems for mechanical seals

Also Published As

Publication number Publication date
US11079021B2 (en) 2021-08-03
GB2517132B (en) 2015-11-11
GB201310427D0 (en) 2013-07-24
US20140367919A1 (en) 2014-12-18

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