CN209744058U - Pressure protection system for large-drop liquefied petroleum gas pipeline - Google Patents
Pressure protection system for large-drop liquefied petroleum gas pipeline Download PDFInfo
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- CN209744058U CN209744058U CN201920435998.6U CN201920435998U CN209744058U CN 209744058 U CN209744058 U CN 209744058U CN 201920435998 U CN201920435998 U CN 201920435998U CN 209744058 U CN209744058 U CN 209744058U
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Abstract
the utility model discloses a big drop liquefied petroleum gas pipeline pressure protection system, including defeated pump system, the long-range pressure protection system in upper reaches, independent parameter monitoring system and logic control system etc. wherein: the liquefied petroleum gas enters the external delivery pump system through the in-station storage tank, is conveyed to a downstream station by a liquefied petroleum gas pipeline after being pressurized, and is received by the storage tank. The trend of the line pipeline is characterized by high starting point, low middle part and slightly high tail point. The pipeline low-point parameters are collected and uploaded by an online low-point parameter detection system, and are analyzed by a logic control system, and then protection operation is carried out by an upstream remote pressure protection system. The utility model provides an operation technology who takes "long-range pressure control in the station of upper reaches" to big drop liquefied petroleum gas pipeline, with the help of the means that predetermines the estimated value and combine together with the actual measurement calculated value, the extreme operating mode pressure of the big drop section pipeline of distal end in the rational control saves pipeline low point pressure protection station investment and fortune dimension personnel spending.
Description
Technical Field
The utility model relates to a large drop liquefied petroleum gas pipeline pressure protection system.
Background
In recent years, with the rapid development of natural gas processing and treatment technologies, liquefied petroleum gas is used as an important natural gas hydrocarbon liquid recovery byproduct, wherein the demand for long-distance pipeline transportation is continuously increased. The liquefied petroleum gas has the characteristics of high octane number, good anti-explosion performance, high heat value and the like, but as the density of the liquefied petroleum gas is lighter than that of water in a liquid phase, heavier than that of air in a gas phase, and extremely high volatility, once pipeline leakage occurs, liquid phase gasification and gas aggregation inevitably occur, and major accidents are easily caused. Therefore, the safety protection of the liquefied petroleum gas pipeline is very important.
The liquefied petroleum gas has the characteristics of static pressure difference in transportation of liquid hydrocarbons and rapid volatilization after discharge, so that the overpressure analysis and pressure control technology has higher requirements on design technology, automatic control technology and the like. At present, a plurality of technologies aiming at the pressure protection of the liquefied petroleum gas pipeline are continuously reported, and great breakthroughs are made mainly by the development of water hammer protection technologies.
with the increasing of liquefied petroleum gas long-distance pipeline projects, pipeline projects under complex terrains are more common, and the construction technical requirements are continuously improved, wherein the pressure protection theory and technology represented by a liquefied petroleum gas pipeline in a high-fall terrain are urgently needed to be further developed. In the high-drop liquefied petroleum gas pipeline, when the pipeline normally runs, the operating pressure of a high-drop section is lower than the pressure of a starting point, the highest pressure of the system generally appears at an output of an external transmission pump at the starting point, and the external transmission pump is provided with an overpressure protection loop; once the pipeline is accidentally closed at the downstream, if the output pump is not closed timely or cannot be closed due to a control problem, the output pump is probably caused to fill and fill the closed pipeline in a low-altitude U-shaped section close to the downstream of the pipeline, a hydrostatic pressure system based on the highest discharge pressure of the output pump is quickly established by the pipeline system, the U-shaped bottom pipeline pressure is equal to the hydrostatic pressure plus the highest discharge pressure of the starting point, the U-shaped bottom pipeline pressure is abnormally increased in a short time possibly and even exceeds the strength of the pipeline, and serious potential safety hazards are caused. Meanwhile, for the working condition, if pipeline pressure relief measures are set at the low point position, the conditions of equipment, personnel operation and the like need to be considered, higher equipment investment and operation investment are brought, and the difficulty of pipeline safety protection is increased; if a thick-walled pipe with a higher design pressure is selected at a low point, the investment may be greatly increased, and the pipe cleaning may be affected. Therefore, a proper pressure analysis and far-end relief system is designed, in-place pressure control is converted into quantitative pressure relief at the starting point, and the safety control method has great significance for guaranteeing the safety of the high-fall liquefied petroleum gas pipeline system.
disclosure of Invention
in order to overcome the defects of the prior art, the utility model provides a large-drop liquefied petroleum gas pipeline pressure protection system, based on the basic physical properties and the conveying process of liquefied petroleum gas, the hydraulic characteristic of a high-drop pipeline (U-shaped topography) is combined, from the perspective of the overpressure protection process under the extreme working condition of the optimized liquefied petroleum gas pipeline, the operation process of 'remote pressure control in an upstream station' is adopted for the large-drop liquefied petroleum gas pipeline, by means of combining preset estimated values and actual measurement calculated values, the extreme working condition pressure of a far-end large-drop (low-topography) section pipeline in reasonable control is realized, the investment of a pipeline low-point pressure protection station yard and the expenditure of operation and maintenance personnel are saved, the overall operation risk of the pipeline is reduced, or the investment increase caused by adopting a thick-wall pipe for the low-point pipeline is saved, and the design of the liquefied petroleum gas pipeline and the development of the safety protection technology are further promoted.
The utility model adopts the technical proposal that: the utility model provides a large drop liquefied petroleum gas pipeline pressure protection system, includes defeated pump system, the long-range pressure protection system of upper reaches, independent parameter monitoring system and logic control system, wherein:
The external delivery pump system comprises a liquefied petroleum gas storage tank, an inlet pipe section, an external delivery pump, a pipeline behind the pump, an overpressure discharge return branch pipe and a return main pipe which are connected in sequence, and the return main pipe is connected into the liquefied petroleum gas storage tank;
The upstream remote pressure protection system comprises an emergency discharge branch pipe and a manual discharge branch pipe which are connected with each other through an opening on a pipeline behind the pump, wherein an electric valve and a flow-limiting orifice plate are arranged on the emergency discharge branch pipe, and a manual valve and a flow-limiting orifice plate are arranged on the manual discharge branch pipe; the rear ends of the two flow-limiting orifice plates are connected into a main return-discharge pipe through branch pipes;
the independent parameter monitoring system comprises a pressure transmitter and a temperature transmitter which are arranged on a pipeline behind the pump, and a flow transmitter, a pressure transmitter and a temperature transmitter which are arranged on a low-point buried pipeline section;
The logic control system receives detection data uploaded by the independent parameter monitoring system in real time and output pump operation parameters uploaded synchronously, and sends control signals to the upstream remote pressure protection system.
Compared with the prior art, the utility model has the positive effects that: the utility model provides a reply strategy and solution, optimal control scheme to big drop liquefied petroleum gas pipeline extreme pressure protection. The system specifically comprises an output pump system, an independent parameter monitoring system, an upstream remote pressure protection system, a logic control system and the like, wherein: the liquefied petroleum gas enters the external delivery pump system through the in-station storage tank, is conveyed to a downstream station by a liquefied petroleum gas pipeline after being pressurized, and is received by the storage tank. The trend of the line pipeline is characterized by high starting point, low middle part and slightly high tail point. The pipeline low-point parameters are collected and uploaded by an online low-point parameter detection system, and are analyzed by a logic control system, and then protection operation is carried out by an upstream remote pressure protection system. The external delivery pump system comprises a liquefied petroleum gas external delivery centrifugal pump, an outlet overpressure backflow safety valve and a matched pipeline, wherein the external delivery centrifugal pump provides delivery power, the set pressure of the outlet overpressure backflow safety valve is a starting point on-site pressure value with the pressure value of a downstream lowest point pipe section being equal to 1.1 times of the pipeline design pressure under the stop delivery working condition, the discharge pressure of the external delivery centrifugal pump is limited to be ultrahigh, the highest flow pressure during the operation of a pipeline is controlled to be lower than the design pressure, the pipeline safety is guaranteed, and the protection barrier is the last protection barrier after the upstream remote pressure protection system fails; the independent parameter monitoring system provides real-time detection parameters for pressure, temperature and flow test pipe joints and instruments arranged at the middle section of the pipeline and the lowest point of the altitude; the upstream pressure protection system is an emergency relief valve, a manual relief valve, a flow-limiting orifice plate and a return pipeline which are arranged on a pipeline in a station at the downstream of an upstream output pump, and is used for quickly relieving a medium at a starting point section according to the highest bearing pressure of a low point of the pipeline by means of control or prompt of a logic control system during the operation of the system, controlling the pressure at the starting point section and ensuring the safety of the system; the logic control system comprises a pump stopping signal control system and a valve opening signal control system, transmits an action instruction to the upstream pressure protection system, and protects a pipeline system. The utility model discloses an advantage concrete performance does:
(1) Science of setup
The utility model discloses based on liquefied petroleum gas pipeline operation and stop defeated in-process pressure variation law, set up independent parameter monitoring system at pipeline low reaches low point, carry out real time monitoring to temperature, pressure and flow, carry out system protection through one-level protection system (the upper reaches is long-range, initiative pressure release system) and second grade protection system (the superpressure relief valve is released) to guarantee that the low point pressure does not exceed the restriction of pipeline safety pressure. The system is independent of a conventional output pump logic pump stopping system, and plays a role in enhancing protection.
(2) Good economical efficiency
The system aims at the liquefied petroleum gas pipeline with higher saturated vapor pressure, and based on the hydraulic characteristics of the high-fall U-shaped pipeline, the long-distance tank returning discharge pipeline is utilized to replace an on-site pressure release system and a thick-wall reinforced pipeline along the way, so that the pressure release station with low use frequency along the line and the economic and personnel investment caused by the pressure release station are avoided, and the investment increase and the pipe cleaning and ball clamping risks caused by the adoption of the thick-wall pipeline are also avoided.
(3) Reliable control
The upstream remote pressure protection system is provided with an electric opening and an in-station manual opening simultaneously, and further depends on the relief protection of an overpressure safety valve, so that the safety redundancy is ensured to be sufficient.
(4) Promote the development of technology
the high saturated vapor pressure pipeline represented by the liquefied petroleum gas pipeline is limited by medium characteristics, is far more complicated than the conventional hydrocarbon liquid pipeline in overpressure mechanism and overpressure protection, and the protection theory provided by the utility model can promote the technical development of the related high saturated vapor pressure medium conveying pipeline.
drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a schematic diagram of a pressure protection system for a large-drop liquefied petroleum gas pipeline according to the present invention.
Detailed Description
The utility model discloses a big drop liquefied petroleum gas pipeline pressure protection system, including defeated pump system, independent parameter monitoring system, the long-range pressure protection system in upper reaches and logic control system etc..
As shown in fig. 1, a pressure protection system for a large-head liquefied petroleum gas pipeline mainly comprises: the liquefied petroleum gas pressure regulating valve comprises a liquefied petroleum gas storage tank 1, an inlet pipe section 2, an output pump 3, a pump rear pipeline 4, an overpressure relief return branch pipe 5, an overpressure safety valve 6, an emergency relief branch pipe 7, an electric valve 8, a manual relief branch pipe 9, a manual valve 10, a flow limiting orifice plate 11/12, a pressure transmitter 13/14, a temperature transmitter 15/16, a flow transmitter 17, a bypass branch pipe 18, a main line bypass ball valve 19/21, an output cut-off valve 20 and a return main pipe 22.
The liquefied petroleum gas storage tank 1, the inlet pipe section 2, the outward delivery pump 3, the post-pump pipeline 4, the overpressure discharge and backflow branch pipe 5, the overpressure safety valve 6, the outward delivery block valve 20 and the backflow header pipe 22 form an outward delivery pump system, and the outward delivery pump system is responsible for storing and pressurizing liquefied petroleum gas and inputting the liquefied petroleum gas into a downstream pipeline; under the condition of overpressure discharged outside, the liquefied petroleum gas receiving device is responsible for receiving the liquefied petroleum gas returned from the overpressure safety valve to ensure the safety of a pipeline; as a redundant arrangement for the upstream remote pressure protection system in the event of an overpressure condition caused by an accidental closure of the downstream output block valve 20.
In particular, the amount of the solvent to be used,
1) The liquefied petroleum gas storage tank 1 is a steel storage tank, is arranged in an open space, plays roles in storing and outputting the liquefied petroleum gas, and receives the liquefied petroleum gas which enters from a system at the downstream of an output pump in the working conditions of overpressure, emergency release and the like;
2) The inlet pipe section 2 is a steel pipe, is installed in the open air and is connected with the external delivery pump 3; the external delivery pump 3 is a barrel-bag pump, is installed in a buried manner, and is used for pressurizing and outputting the liquefied petroleum gas; the output pump 3 receives regular logic control (downstream valve closed); the pump rear pipeline 4 is connected with the output pump 3 and a downstream pipeline, is installed in the open air, is provided with a heat preservation system and a heat tracing system, and plays a role in maintaining the temperature of a medium in the pipeline under the working condition of stopping transmission.
3) the overpressure discharge return branch pipe 5 is connected with an opening on the pump rear pipeline 4, the pipe diameter is not less than DN100, and the downstream is connected with an overpressure safety valve 6; the overpressure safety valve 6 adopts a spring type safety valve, the pressure is set to be a starting point on-position pressure value with the pressure value of the lowest downstream point pipe section being equal to 1.1 times of the design pressure of the pipeline under the stop transmission working condition, and the discharge medium is discharged into the return main pipe 22 and enters the liquefied petroleum gas storage tank 1; the return main pipe is connected to the top of the liquefied petroleum gas storage tank 1 according to the gradient of 3 per mill; the maximum discharge capacity of the overpressure safety valve 6 is 1.2 times of the maximum discharge capacity of the output pump 3 under extreme conditions.
The emergency relief branch pipe 7, the electric valve 8, the manual relief branch pipe 9, the manual valve 10, the flow limiting orifice plate 11/12 and the like form an upstream remote pressure protection system, and are responsible for preventing the pressure of the middle low-point pipeline from exceeding the design pressure after the pressure of the starting point of the pipeline rises due to stopping transportation, blockage and the like, performing remote pressure relief on the upstream of the pipeline, releasing part of liquefied petroleum gas in the pipeline back to the storage tank, controlling the distribution change of the pipeline medium along the process pressure after the pipeline medium is changed from a flowing state to an approximate static state, and also controlling the pressure change of the pipeline caused by thermal expansion after long-term stopping transportation.
In particular, the amount of the solvent to be used,
1) The emergency discharge branch pipe 7 is connected with the opening on the pump rear pipeline 4, the pipe diameter is not less than DN100, and the downstream is connected with an electric valve 8 and a flow-limiting orifice plate 11; the electric valve 8 is an electric ball valve, is normally closed and is controlled to be opened or closed according to the logic control system; the flow-limiting orifice plate 11 plays a role in pressure relief and flow limitation of an emergency discharge medium; the orifice plate 11 is connected with branch pipes and is connected with a return main pipe 22.
2) The electrically operated valve 8 is according to: the three working conditions that the output point pressure reaches a release set value, the downstream low point pressure exceeds the pipeline design pressure or the valve closing signal of the valve on the way is sent, the output pump 3 is not stopped are carried out for one out of three, and the emergency starting is carried out after the three working conditions are met; after three working conditions of 'three-out-of-three' that the output pump 3 stops after the output point pressure is lower than a set value, the downstream low point pressure is lower than the pipeline design pressure and a valve closing signal of a valve on the way is sent out, the output pump is slowly closed; and the discharge set value is a starting point on-position pressure value with the pressure value of the pipe section at the lowest point of the downstream being equal to 1.0 time of the design pressure of the pipeline under the condition of stopping conveying.
3) The manual discharge branch pipe 9 is connected with the opening on the pump rear pipeline 4, the pipe diameter is not less than DN100, the downstream is connected with a manual valve 10 and is connected with a flow-limiting orifice plate 12; the manual valve 10 is a manual ball valve and is normally closed, three working conditions that one of three conditions is selected to meet the requirement of emergency alarm after the output pump 3 is not stopped after the output point pressure reaches a release set value and the downstream low point pressure exceeds the pipeline design pressure or a valve closing signal of the valve on the way is sent are carried out, and the safety of the system is further improved through manual on-position opening.
The pressure transmitter 13/14, the temperature transmitter 15/16 and the flow transmitter 17 form an independent parameter monitoring system, and are specially responsible for monitoring the pressure, the temperature and the flow of the key positions of the pipeline, so that detection parameters are provided for the safe operation in the system.
Specifically, the method comprises the following steps:
1) the pressure transmitter 13 and the temperature transmitter 15 are arranged on the pump rear pipeline 4, detect the pressure and the temperature of the pump rear medium in real time and upload data to the logic control system;
2) the pressure transmitter 14, the temperature transmitter 16 and the flow transmitter 17 are arranged on the low-point buried pipe section, detect the pressure, the temperature and the flow of a medium in the low-point pipe in real time and upload data to the logic control system; the pressure transmitter 14 and the temperature transmitter 16 are arranged on a bypass branch pipe 18 of a low-point buried pipe section so as to avoid influencing pipe cleaning; the flow transmitter 17 is directly clamped on the trunk pipe section; a trunk bypass ball valve 19/21 is provided upstream and downstream of the bypass branch pipe 18, and is closed to isolate the trunk medium when the pressure transmitter 14 and the temperature transmitter 16 are serviced.
3) The operation parameters of the output pump 3 are also synchronously uploaded to the logic control system.
In addition, a logic control system of the system is arranged on an external transmission pump station, an independent signal channel is arranged to process signals uploaded by the independent parameter monitoring system, and an action instruction is sent to an upstream remote pressure protection system.
By utilizing the content, the pressure protection method for the large-fall liquefied petroleum gas pipeline is provided, and comprises the following steps:
The method comprises the following steps: extracting elevations of a starting point and a lowest point in the midway according to the terrain, and calculating the hydrostatic pressure difference after the liquefied petroleum gas stops being transported; calculating to obtain a starting point on-site pressure value by utilizing the pipeline design pressure and the obtained hydrostatic pressure difference, wherein the starting point on-site pressure value comprises a safety valve take-off pressure and an electric ball valve starting pressure; and if the water hammer pressure caused by valve closing is more than 10% of the required stop and transmission hydrostatic pressure difference, calculating to obtain the start point on-site pressure value including the safety valve take-off pressure and the electric ball valve starting pressure by utilizing the pipeline design pressure, the required hydrostatic pressure difference and the water hammer pressure.
Step two: during normal conveying, liquefied petroleum gas is pumped into a downstream pipeline through the output pump 3, the overpressure safety valve 6 is closed, the electric valve 8 is closed, the manual valve 10 is closed, the pressure transmitter 13/14, the temperature transmitter 15/16 and the flow transmitter 17 are monitored normally, and the main bypass ball valve 19/21 is opened.
Step three: after the downstream outward delivery cut-off valve 20 is closed, the interlocking upstream outward delivery pump 3 stops; if the upstream external pump 3 stops failure and further causes continuous filling of a downstream pipeline, the logic control system receives a continuous operation signal of the external pump 3, and the continuous operation signal is used as one of the signals for automatically controlling opening of the electric ball valve 8 and alarming opening of the manual valve 10; the output point pressure transmitter 13 monitors the pressure exceeding the release set value as the second signal of the automatic control opening of the electric ball valve 8 and the alarm opening of the manual valve 10; and the downstream low-point pressure monitored by the lowest-point pressure transmitter 14 exceeds the pipeline design pressure as a third signal for the automatic control opening of the electric ball valve 8 and the alarm opening of the manual valve 10. According to the signals, the electric ball valve 8 is automatically opened or the manual valve 10 is manually opened immediately when the signals meet the requirements, and system pressure protection is carried out; after the pressure of the output point is lower than the set value, the pressure of the downstream low point is lower than the design pressure of the pipeline and a valve closing signal of the valve on the way is sent, the output pump 3 stops three working conditions, three are selected and three are met, and then the output pump is slowly closed.
Step four: and if the pressure of each pressure monitoring point of the system is continuously increased due to the fact that the system pressure release still cannot be carried out in the third step, entering a passive protection program, starting the overpressure safety valve 6 when the pressure monitored by the output point pressure transmitter 13 exceeds the tripping pressure of the safety valve, and releasing overpressure medium to the liquefied petroleum gas storage tank 1.
step five: after the pipeline stops in winter, the independent parameter monitoring system, the upstream remote pressure protection system, the logic control system and the like keep working states, and when the medium pressure rises due to thermal expansion, the external input point pressure transmitter 13 monitors that the pressure exceeds a release set value and serves as one of the signals for automatically controlling the opening of the electric ball valve 8 and alarming and opening the manual valve 10; and the downstream low-point pressure monitored by the lowest-point pressure transmitter 14 exceeds the pipeline design pressure as the second signal of the automatic control opening of the electric ball valve 8 and the alarm opening of the manual valve 10. According to the signals, the electric ball valve 8 is automatically opened or the manual valve 10 is manually opened immediately when the signals are met, and the system pressure protection is carried out. Further, if the steps are not completed and the pressure of each pressure monitoring point of the system is continuously increased, a passive protection program is entered, when the pressure monitored by the output point pressure transmitter 13 exceeds the tripping pressure of the safety valve, the overpressure safety valve 6 is started, and overpressure medium is released to the liquefied petroleum gas storage tank 1.
the utility model discloses a theory of operation does:
In the large-drop liquefied petroleum gas pipeline, when a large-drop section with extremely low topography exists at the tail end of the pipeline, the pressure of the low-point section is often lower under the influence of friction resistance in normal conveying, the pipeline can adopt uniform design pressure selected according to starting pressure on the whole line, the uniform wall thickness of the whole line is realized, and a low-point section nearby protection system or station yard is not additionally arranged; when a downstream valve of a low point section is closed accidentally, if an upstream external delivery pump stops delivering and stops delaying or fails to stop, the system cannot discharge medium in a pipeline by means of an overpressure safety valve normally arranged downstream of the external delivery pump (the safety valve mainly ensures that the external discharge pressure does not exceed the design pressure of the pipeline during normal delivery of the pipeline, and the set value of the safety valve is high), extreme pressure coupling between filling pressure and hydrostatic pressure may be formed at the low point section, and the pressure value may exceed the external discharge pressure of the external delivery pump, so that an emergency discharge system needs to be arranged to discharge the back pressure of the external delivery pump to reduce the actual pressure at the downstream low point. The utility model is provided with independent pressure, temperature and flow detection devices at the output starting point and the large drop low point, and carries out real-time detection and transmission on the on-line parameters under the working conditions, and the electric valve 8 is emergently opened after three working conditions, namely the output pump 3 is not stopped after the pressure of the output point reaches a release set value and the pressure of the downstream low point exceeds the pipeline design pressure or a downstream valve closing signal is sent out, and the like; and after three working conditions of the external delivery point pressure being lower than the set value, the downstream low point pressure being lower than the pipeline design pressure, the external delivery pump 3 stopping and the like are met, the valve is closed slowly, so that the remote protection of the low point pipeline system is realized under the condition that the low point nearby discharge facility is not increased or the design pressure of the low point section is not improved.
Claims (8)
1. The pressure protection system for the large-drop liquefied petroleum gas pipeline is characterized in that: including defeated pump system, the long-range pressure protection system of upper reaches, independent parameter monitoring system and logic control system, wherein:
The external delivery pump system comprises a liquefied petroleum gas storage tank, an inlet pipe section, an external delivery pump, a pipeline behind the pump, an overpressure discharge return branch pipe and a return main pipe which are connected in sequence, and the return main pipe is connected into the liquefied petroleum gas storage tank;
The upstream remote pressure protection system comprises an emergency discharge branch pipe and a manual discharge branch pipe which are connected with each other through an opening on a pipeline behind the pump, wherein an electric valve and a flow-limiting orifice plate are arranged on the emergency discharge branch pipe, and a manual valve and a flow-limiting orifice plate are arranged on the manual discharge branch pipe; the rear ends of the two flow-limiting orifice plates are connected into a main return-discharge pipe through branch pipes;
The independent parameter monitoring system comprises a pressure transmitter and a temperature transmitter which are arranged on a pipeline behind the pump, and a flow transmitter, a pressure transmitter and a temperature transmitter which are arranged on a low-point buried pipeline section;
The logic control system receives detection data uploaded by the independent parameter monitoring system in real time and output pump operation parameters uploaded synchronously, and sends control signals to the upstream remote pressure protection system.
2. The large head lpg pipeline pressure protection system of claim 1, wherein: the liquefied petroleum gas storage tank, the inlet pipe section and the pump rear pipeline are installed in an exposed mode, the output pump is installed in a buried mode, the downstream of the overpressure relief return branch pipe is connected with an overpressure safety valve, and a relief medium of the overpressure safety valve enters the liquefied petroleum gas storage tank through the return main pipe.
3. the large head lpg pipeline pressure protection system of claim 2, wherein: the liquefied petroleum gas storage tank is a steel storage tank; the inlet pipe section is a steel pipeline; the external delivery pump is a barrel bag pump; the pipeline behind the pump is provided with a heat preservation system and a heat tracing system; the pipe diameter of the overpressure release return branch pipe is not less than DN 100; the overpressure safety valve is a spring type safety valve.
4. the large head lpg pipeline pressure protection system of claim 2, wherein: the main return-discharge pipe is connected to the top of the liquefied petroleum gas storage tank according to the gradient of 3 per mill.
5. the large head lpg pipeline pressure protection system of claim 2, wherein: an output cut-off valve is arranged at the downstream of the pipeline behind the pump.
6. The large head lpg pipeline pressure protection system of claim 1, wherein: the pipe diameters of the emergency discharging branch pipe and the manual discharging branch pipe are not less than DN 100; the electric valve is an electric ball valve and is normally closed, and the opening or the closing is controlled according to the logic control system; the manual valve is a manual ball valve, is normally closed and is manually opened in place.
7. The large head lpg pipeline pressure protection system of claim 1, wherein: the pressure transmitter and the temperature transmitter are arranged on a bypass branch pipe of the low-point buried pipe section; the flow transmitter is clamped on the trunk pipe section.
8. the large head lpg pipeline pressure protection system of claim 7, wherein: and a trunk bypass ball valve is arranged at the upstream and downstream of the bypass branch pipe.
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| CN201920435998.6U CN209744058U (en) | 2019-04-02 | 2019-04-02 | Pressure protection system for large-drop liquefied petroleum gas pipeline |
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| CN201920435998.6U CN209744058U (en) | 2019-04-02 | 2019-04-02 | Pressure protection system for large-drop liquefied petroleum gas pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915731A (en) * | 2019-04-02 | 2019-06-21 | 中国石油工程建设有限公司 | A kind of big drop lpg pipeline pressure protective system and method |
| CN113803644A (en) * | 2021-09-17 | 2021-12-17 | 国家石油天然气管网集团有限公司 | Method for judging working condition in large-drop oil pipeline and method for controlling stop valve |
-
2019
- 2019-04-02 CN CN201920435998.6U patent/CN209744058U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109915731A (en) * | 2019-04-02 | 2019-06-21 | 中国石油工程建设有限公司 | A kind of big drop lpg pipeline pressure protective system and method |
| CN109915731B (en) * | 2019-04-02 | 2024-01-26 | 中国石油工程建设有限公司 | Pressure protection system and method for large-drop liquefied petroleum gas pipeline |
| CN113803644A (en) * | 2021-09-17 | 2021-12-17 | 国家石油天然气管网集团有限公司 | Method for judging working condition in large-drop oil pipeline and method for controlling stop valve |
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Effective date of registration: 20210220 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |
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