GB2034006A - Over Pressure Protection of Pressure Vessels by Drogue - Google Patents

Over Pressure Protection of Pressure Vessels by Drogue Download PDF

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Publication number
GB2034006A
GB2034006A GB7933427A GB7933427A GB2034006A GB 2034006 A GB2034006 A GB 2034006A GB 7933427 A GB7933427 A GB 7933427A GB 7933427 A GB7933427 A GB 7933427A GB 2034006 A GB2034006 A GB 2034006A
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GB
United Kingdom
Prior art keywords
pressure
drogue
fluid
circuit
pressure relief
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.)
Withdrawn
Application number
GB7933427A
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.)
BP PLC
Original Assignee
BP PLC
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 BP PLC filed Critical BP PLC
Priority to GB7933427A priority Critical patent/GB2034006A/en
Publication of GB2034006A publication Critical patent/GB2034006A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
    • B01J3/002—Component parts of these vessels not mentioned in B01J3/004, B01J3/006, B01J3/02 - B01J3/08; Measures taken in conjunction with the process to be carried out, e.g. safety measures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/0006—Controlling or regulating processes
    • B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/00049—Controlling or regulating processes
    • B01J2219/00245—Avoiding undesirable reactions or side-effects
    • B01J2219/0027—Pressure relief

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Safety Valves (AREA)

Abstract

A fluid relief system for pressure vessels for use especially under emergency conditions comprises a collapsible drogue 6 which is made of plastics material, connected to the outlet of a pressure relief valve 3. <IMAGE>

Description

SPECIFICATION Over Pressure Protection of Pressure Vessels by Drogue The present invention relates to a fluid relief system for pressure vessels for use especially under emergency conditions.
Circuits in which a fluid moves under pressure from a source to a delivery point normally contain a relief valve to limit the maximum pressure of the circuit and to provide protection for ancillary equipment. In off-shore operations for the production of oil, both pressure control systems and flow control systems are involved.
Similar considerations apply to other pressure relief systems installed in most petrochemical plants utilising flammable, caustic or acidic fluids which are offensive to the environment. The need for containment of such offensive fluids also applies to relatively less hazardous liquids such as the produced water in crude oil which inevitably contains significant quantities of dissolved hydrocarbon gases as contaminants. This contaminated water if discharged into the environment may cause an unacceptable degree of pollution.Hitherto the relief systems used to counter emergencies during the pumping of fluids such as crude oil have either taken the form of expensive surge tanks or have involved complex instrumentation systems with finite reiiability. In the particular case of off-shore platforms for drilling oil, the problem of relief systems is further complicated not only by the environmental pollution hazards but also by the possibility of oil being lost.
Accordingly, the present invention is a pressure relief system comprising a pressure relief valve which is connected to a collapsible drogue.
The pressure relief system of the present invention is suitable used as a part of a circuit in which fluid is conveyed under pressure from a source to a delivery point. The pressure relief system of the present invention may form part of either a conventional pressure control system or a conventional flow control system. In such systems, the pressure relief valve may be any of the conventional types and is particularly useful in systems in which fluid relief is normally to atmosphere. For example, the pressure relief valve may be of the spring-loaded type or a two-stage valve which can be remotely operated or controlled by pilot pressure.
The collapsible drogue connected to the relief valve should be impervious to the fluid in the circuit and should naturally be resistant to attack by that fluid. Thus the drogue is suitably made of a material selected from nylon, synthetic rubber, (reinforced) polyester and any flexible substrate coated therewith. The capacity of the drogue would also be dependent upon factors such as the pressure in the circuit, the volume of fluid being pumped at maximum load of the circuit, the duration of operation of the circuit and the like.
The drogue may be provided with a gas relief valve.
One of the particular advantages of the drogue of the present system is that in its deflated form it can be accommodated in a relatively small space for example on an off-shore drilling platform or its jacket. If a drogue of adequate size is chosen it could accept full fluid throughput for the time required to bring an emergency situation under control. By using the drogue no fluid would be lost, no pollution would be caused and dependence on instrumentation with finite reliability would be avoided at relatively low cost in terms of space and expense.
The pressure relief system of the present invention is further illustrated with reference to the accompanying drawing: The drawing shows a sectional view of a typical pressure relief system. In the drawing a section of a circuit which is the pressure source (1) is connected to a spring-loaded relief valve (2) which is in sealing contact with a valve seat (3).
The outlet (4) of the relief valve is connected to a drogue (6) via the connection (5).
In operation, when the fluid pressure in the circuit is normal i.e. within a predetermined level, the valve (2) is in sealing contact with the valve seat (3). When the fluid pressure in the circuit exceeds the predetermined level, the valve is pushed open against the natural bias of the spring allowing an amount of fluid to flow from the circuit, via the outlet (4) into a drogue (6) so as to normalise the pressure in the circuit. The fluid is collected in the drogue and this may then be recycled, used or treated as desired without loss or damage to the environment.
Claims
1. A pressure relief system comprising a pressure relief valve which is connected to a collapsible drogue.
2. A pressure relief system according to claim 1 wherein said system is part of a circuit in which fluid is conveyed under pressure from a source to a delivery point.
3. A pressure relief system according to claim 1 or 2 wherein the pressure relief valve is a two stage valve which is remotely controlled or operated by pilot pressure.
4. A pressure relief system according to any one of the preceding claims wherein the drogue is of a material selected from nylon, synthetic rubber, (reinforced) polyester and any flexible substrate coated therewith.
5. A pressure relief system accrding to claim 1 substantially as hereinbefore described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Over Pressure Protection of Pressure Vessels by Drogue The present invention relates to a fluid relief system for pressure vessels for use especially under emergency conditions. Circuits in which a fluid moves under pressure from a source to a delivery point normally contain a relief valve to limit the maximum pressure of the circuit and to provide protection for ancillary equipment. In off-shore operations for the production of oil, both pressure control systems and flow control systems are involved. Similar considerations apply to other pressure relief systems installed in most petrochemical plants utilising flammable, caustic or acidic fluids which are offensive to the environment. The need for containment of such offensive fluids also applies to relatively less hazardous liquids such as the produced water in crude oil which inevitably contains significant quantities of dissolved hydrocarbon gases as contaminants. This contaminated water if discharged into the environment may cause an unacceptable degree of pollution.Hitherto the relief systems used to counter emergencies during the pumping of fluids such as crude oil have either taken the form of expensive surge tanks or have involved complex instrumentation systems with finite reiiability. In the particular case of off-shore platforms for drilling oil, the problem of relief systems is further complicated not only by the environmental pollution hazards but also by the possibility of oil being lost. Accordingly, the present invention is a pressure relief system comprising a pressure relief valve which is connected to a collapsible drogue. The pressure relief system of the present invention is suitable used as a part of a circuit in which fluid is conveyed under pressure from a source to a delivery point. The pressure relief system of the present invention may form part of either a conventional pressure control system or a conventional flow control system. In such systems, the pressure relief valve may be any of the conventional types and is particularly useful in systems in which fluid relief is normally to atmosphere. For example, the pressure relief valve may be of the spring-loaded type or a two-stage valve which can be remotely operated or controlled by pilot pressure. The collapsible drogue connected to the relief valve should be impervious to the fluid in the circuit and should naturally be resistant to attack by that fluid. Thus the drogue is suitably made of a material selected from nylon, synthetic rubber, (reinforced) polyester and any flexible substrate coated therewith. The capacity of the drogue would also be dependent upon factors such as the pressure in the circuit, the volume of fluid being pumped at maximum load of the circuit, the duration of operation of the circuit and the like. The drogue may be provided with a gas relief valve. One of the particular advantages of the drogue of the present system is that in its deflated form it can be accommodated in a relatively small space for example on an off-shore drilling platform or its jacket. If a drogue of adequate size is chosen it could accept full fluid throughput for the time required to bring an emergency situation under control. By using the drogue no fluid would be lost, no pollution would be caused and dependence on instrumentation with finite reliability would be avoided at relatively low cost in terms of space and expense. The pressure relief system of the present invention is further illustrated with reference to the accompanying drawing: The drawing shows a sectional view of a typical pressure relief system. In the drawing a section of a circuit which is the pressure source (1) is connected to a spring-loaded relief valve (2) which is in sealing contact with a valve seat (3). The outlet (4) of the relief valve is connected to a drogue (6) via the connection (5). In operation, when the fluid pressure in the circuit is normal i.e. within a predetermined level, the valve (2) is in sealing contact with the valve seat (3). When the fluid pressure in the circuit exceeds the predetermined level, the valve is pushed open against the natural bias of the spring allowing an amount of fluid to flow from the circuit, via the outlet (4) into a drogue (6) so as to normalise the pressure in the circuit. The fluid is collected in the drogue and this may then be recycled, used or treated as desired without loss or damage to the environment. Claims
1. A pressure relief system comprising a pressure relief valve which is connected to a collapsible drogue.
2. A pressure relief system according to claim 1 wherein said system is part of a circuit in which fluid is conveyed under pressure from a source to a delivery point.
3. A pressure relief system according to claim 1 or 2 wherein the pressure relief valve is a two stage valve which is remotely controlled or operated by pilot pressure.
4. A pressure relief system according to any one of the preceding claims wherein the drogue is of a material selected from nylon, synthetic rubber, (reinforced) polyester and any flexible substrate coated therewith.
5. A pressure relief system accrding to claim 1 substantially as hereinbefore described with reference to the accompanying drawing.
GB7933427A 1978-09-27 1979-09-26 Over Pressure Protection of Pressure Vessels by Drogue Withdrawn GB2034006A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7933427A GB2034006A (en) 1978-09-27 1979-09-26 Over Pressure Protection of Pressure Vessels by Drogue

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7838499 1978-09-27
GB7933427A GB2034006A (en) 1978-09-27 1979-09-26 Over Pressure Protection of Pressure Vessels by Drogue

Publications (1)

Publication Number Publication Date
GB2034006A true GB2034006A (en) 1980-05-29

Family

ID=26268994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7933427A Withdrawn GB2034006A (en) 1978-09-27 1979-09-26 Over Pressure Protection of Pressure Vessels by Drogue

Country Status (1)

Country Link
GB (1) GB2034006A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2204665A (en) * 1987-03-31 1988-11-16 Bryan Donkin Co Ltd Improvements to gas pressure regulatory systems
US4890764A (en) * 1988-04-11 1990-01-02 Alberto Rossini Stationary or mobile container for containing or shipping substances that are toxic, dangerous, contaminated or, in any case, harmful to health and the environment
DE4015354A1 (en) * 1990-05-12 1991-11-14 Rembe Gmbh Mess Und Regeltechn Quenching device with air bag - works in conjunction with pressure container secured by bursting plate

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2204665A (en) * 1987-03-31 1988-11-16 Bryan Donkin Co Ltd Improvements to gas pressure regulatory systems
GB2204665B (en) * 1987-03-31 1991-11-13 Bryan Donkin Co Ltd Improvements to gas pressure regulators.
US4890764A (en) * 1988-04-11 1990-01-02 Alberto Rossini Stationary or mobile container for containing or shipping substances that are toxic, dangerous, contaminated or, in any case, harmful to health and the environment
DE4015354A1 (en) * 1990-05-12 1991-11-14 Rembe Gmbh Mess Und Regeltechn Quenching device with air bag - works in conjunction with pressure container secured by bursting plate
DE4015354C2 (en) * 1990-05-12 1999-12-23 Rembe Gmbh Mes Und Regeltechni Pressure relief device

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)