CN211344795U - Liquid ethane pipeline valve chamber relief system - Google Patents
Liquid ethane pipeline valve chamber relief system Download PDFInfo
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- CN211344795U CN211344795U CN201922228720.4U CN201922228720U CN211344795U CN 211344795 U CN211344795 U CN 211344795U CN 201922228720 U CN201922228720 U CN 201922228720U CN 211344795 U CN211344795 U CN 211344795U
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Abstract
The utility model discloses a liquid ethane pipeline valve room relief system, including valve room trunk system, valve room bypass system, bypass extension branch pipe system, portable unloading system and trunk line temperature detecting system. Compared with the prior art, the utility model has the positive effects that: the utility model discloses according to the characteristics that liquid ethane pipeline stops to lose the back discharge process and produces the lower temperature easily in pipeline body and unloading system, according to operation safety and selected materials economic nature, through measures such as setting up main line temperature detecting system, bypass extension branch pipe system and portable unloading system, optimize the planned unloading technology of ethane pipeline valve room, reach safe, economic operation's effect.
Description
Technical Field
The utility model relates to a liquid ethane pipeline valve room relief system.
Background
With the development of natural gas treatment technology and the development of natural gas efficient utilization technology, the ethane recovery capacity in natural gas is continuously improved, and long-distance transportation technology thereof is urgently needed to be vigorously developed. Ethane products, which are lighter in molar mass as a natural gas byproduct, have a higher saturated vapor pressure, a critical temperature of about 32 ℃ and a critical pressure of about 4.5MPa, and therefore are transported in a single phase in a gas phase or liquid phase under certain conditions. Compared with a gaseous ethane pipeline conveying mode, the liquid conveying mode has the remarkable characteristics of small pipe diameter and high conveying efficiency, and is suitable for large-scale and pipe network conveying of ethane products.
In order to ensure that the pipeline is convenient to maintain and overhaul in a segmented manner and reduce the release amount in the maintenance and inspection process, the valve chambers are required to be arranged on long-distance pipelines. At present, valve chamber arrangement processes of pipelines for long-distance natural gas, crude oil, product oil, LPG and the like are basically mature, the main functions are pipeline cutting and medium emptying (diffusing) or recycling, and materials of valve chamber stations and emptying systems are basically carbon steel. For liquid ethane, the liquid ethane has higher latent heat of vaporization and Joule-Thompson effect, after a liquid phase medium in a pipeline is quickly decompressed to atmospheric pressure, the downstream adiabatic relief temperature can reach-80 ℃, and the inside of the pipeline can possibly have a working condition lower than-40 ℃ due to decompression, so that the influence of medium phase change and decompression in the decompression process on the long-distance pipeline body and the emptying system material must be considered in the relief process of a valve chamber, and the safety of the system under the low-temperature working condition is ensured; meanwhile, the molar mass of the liquid ethane is about 30g/mol, the liquid ethane is slightly heavier than air, and after the liquid ethane is released to the atmosphere, the problems of large-range suspension, low-position accumulation and the like occur, and a proper emptying medium treatment mode must be considered.
Although the liquid ethane pipeline has huge prospect, the construction of the liquid ethane long-distance pipeline is not developed at home at present. Meanwhile, related research is mainly focused on the liquid ethane pipeline conveying process, and detailed valve chamber design and research progress are not reported yet.
Therefore, research and measures are actively needed to ensure the safety of emptying the liquid ethane pipeline valve chamber, and a set of feasible and economic solution is formed.
Disclosure of Invention
In order to overcome prior art's shortcoming, the utility model provides a liquid ethane pipeline valve room relief system aims at further promoting liquid ethane pipeline transportation technical development, guarantee operation safety. The utility model discloses based on liquid ethane long distance pipeline valve room sets up basic function demand, combine liquid ethane medium phase, pressure, the temperature variation law at the valve room relief process, take modes such as high-pressure branch pipe extension, main line temperature pressure detection, low temperature blowdown system sled dress ization, main line low temperature, the low temperature of blowdown system and the low temperature material investment scheduling problem that the liquid ethane pipeline valve room unloading of effective control probably arouses realize that the safety of liquid ethane pipeline, economic valve room are released.
The utility model adopts the technical proposal that: a liquid ethane pipeline valve chamber vent system comprising a valve chamber trunk system, a valve chamber bypass system, a bypass extension leg system, a movable vent system and a trunk pipeline temperature detection system, wherein:
the valve chamber trunk line system comprises a valve chamber trunk line pipeline and a trunk line block valve arranged on the valve chamber trunk line pipeline, and the valve chamber trunk line pipeline is connected with an upstream buried trunk line and a downstream buried trunk line;
the valve chamber bypass system comprises an upstream bypass pipeline and a downstream bypass pipeline which form a closed loop, and a pressure transmitter, a temperature transmitter and a bypass block valve which are respectively arranged on the upstream bypass pipeline and the downstream bypass pipeline;
the bypass extension branch pipe system comprises a bypass branch pipe, a branch pipe block valve and a branch pipe flange, wherein the branch pipe block valve and the branch pipe flange are arranged on the bypass branch pipe;
the movable emptying system comprises an emptying pipeline, and a high-pressure hose, an emptying regulating valve, a reducer and an emptying torch which are sequentially arranged on the emptying pipeline, wherein a butt flange is arranged at the front end of the high-pressure hose;
the main pipeline temperature detection system comprises a distributed temperature measurement optical fiber system arranged along the main pipeline and a temperature measurement system arranged in the valve chamber.
Compared with the prior art, the utility model has the positive effects that:
the utility model discloses according to the characteristics that liquid ethane pipeline stops to lose the back discharge process and produces the lower temperature easily in pipeline body and unloading system, according to operation safety and selected materials economic nature, through measures such as setting up main line temperature detecting system, bypass extension branch pipe system and portable unloading system, optimize the planned unloading technology of ethane pipeline valve room, reach safe, economic operation's effect. The concrete expression is as follows:
(1) science of setup
According to the emptying characteristics of the liquid ethane pipeline valve chamber, the system is provided with a main line temperature and pressure detection system for the upstream pipeline to realize the main line pipeline protection in the emptying process aiming at the problem that the valve chamber emptying is easy to cause low temperature of the upstream main line pipeline and the downstream emptying system; compared with a mode that all the valve chambers are provided with fixed emptying systems, the movable emptying system made of stainless steel is arranged, so that the total engineering investment is reduced, and the requirement of planned emptying of all the valve chambers is met; the high-pressure extension bypass branch pipe is arranged, so that the pipeline length of the emptying system is further reduced, and the field installation work of the movable emptying system is greatly reduced.
(2) Is economical and reasonable
The system is installed after the pipeline is stopped from conveying and needs emptying, replaces the traditional mode that each valve chamber is pre-configured with a fixed emptying system, effectively controls the engineering investment on the basis of ensuring the system functionality, and has good economy.
(3) Promote the development of technology
In view of the liquid ethane pipeline is still in the starting stage in the development of China, the utility model discloses on the basis of the planned emptying technique of liquid ethane pipeline valve room of the abundant research, provided relevant safeguard measure, can provide support and reference to the technical development of the liquid ethane pipeline of China, help promoting this technique further development.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of a liquid ethane pipeline valve chamber relief system of the present invention.
Detailed Description
A liquid ethane pipeline valve chamber vent system, as shown in fig. 1, consisting essentially of: the system comprises an upstream buried trunk line 1, a trunk line block valve 2, a downstream buried trunk line 3, a pressure transmitter 4/6, a temperature transmitter 5/7, a bypass block valve 8/9, a bypass replacement valve 10/11, an upstream bypass pipeline 12, a downstream bypass pipeline 13, a bypass extension branch pipe 14, a branch pipe block valve 15, a branch pipe replacement valve 16, a branch pipe flange 17, a docking flange 18, a high-pressure hose 19, a vent regulating valve 20, a reducer 21, a vent pipeline 23, a flame arrester 24 and a vent torch 25.
The valve chamber trunk line system is composed of an upstream buried trunk line 1, a trunk line block valve 2 and a downstream buried trunk line 3 and is responsible for connecting an upper pipeline and a lower pipeline to form a liquid ethane conveying channel; the trunk line cut-off valve 2 is responsible for pipeline communication or cut-off.
Specifically, the upstream buried trunk line 1 and the downstream buried trunk line 3 are both provided with parallel optical fiber temperature measuring systems for on-way temperature detection during normal operation and temperature detection during trunk line emptying. The trunk line block valve 2 is an electric control full-diameter ball valve, is normally open, and is closed when the upstream buried trunk line 1 or the downstream buried trunk line 2 needs to be overhauled.
The pressure transmitter 4/6, the temperature transmitter 5/7, the bypass cutoff valve 8/9, the bypass replacement valve 10/11, the upstream bypass pipeline 12, the downstream bypass pipeline 13 and the like form a valve chamber bypass system, which is used for performing bleed-off control and bleed-off pipe section selection after the main pipeline is stopped, and also provides fixed-point temperature and pressure detection for the main pipeline emptying process.
Specifically, the upstream bypass pipeline 12 and the downstream bypass pipeline 13 form a closed loop, the materials of the upstream bypass pipeline and the downstream bypass pipeline are all carbon steel, the upstream bypass pipeline and the downstream bypass pipeline are installed in an exposed mode, and the upstream bypass pipeline and the downstream bypass pipeline are respectively connected with a valve chamber main pipeline upstream and downstream of a main line block valve and are used for selecting a discharge pipe section after the main pipeline is stopped and establishing valve opening back pressure when the main pipeline is put into production again; the pressure transmitter 4/6 has pressure detection and uploading capability and is installed in close proximity to the upstream/downstream main line pipes for monitoring pressure during pipe operation, shut-down, and relief conditions. The temperature transmitter 5/7 has temperature detection and uploading functions, is arranged close to the upstream/downstream main pipeline and is used for monitoring the temperature of the pipeline under the working conditions of operation, stop transmission, discharge and the like; the bypass block valve 8/9 is a manual ball valve made of carbon steel and is normally closed, and is respectively installed on the upstream and downstream bypass pipelines and respectively close to the bypass pipeline and the upstream trunk line of the trunk block valve and the downstream trunk line of the trunk block valve, so as to play the roles of controlling the opening and closing of the bypass and selecting a discharge pipe section after the pipeline stops transmission; bypass override valve 10/11 is a manual ball valve, made of carbon steel, normally closed, connected to upstream bypass line 12 and downstream bypass line 13 by pup joint tubing, and immediately downstream of bypass block valve 8/9.
Wherein, bypass extension branch pipe 14, branch pipe block valve 15, branch pipe replacement valve 16, branch pipe flange 17 etc. constitute bypass extension branch pipe system for the medium bleeder channel is pressed in the main line area of providing and extension, make the pressure release point keep away from the main line on the one hand, avoid the low temperature that the pressure release medium arouses to influence the upper reaches main line, on the other hand is satisfying under the prerequisite of evacuation torch and valve chamber interval, reduce the quantity of unloading low pressure stainless steel pipeline, in addition, still be convenient for implement the skid-mounted ization of unloading system, avoid on-the-spot long distance pipe connection.
Specifically, the bypass extension branch pipe 14 is the same as the upstream bypass pipeline 12 and the downstream bypass pipeline 13 in design pressure, pipe diameter and material, is buried underground, has the distance between the starting point and the tail point not less than 50m, meets the requirement that a valve chamber operator is in the safety range of ignition heat radiation of the movable emptying system, is connected with the valve chamber bypass pipeline upstream of the bypass extension branch pipe 14, is reserved and connected with the downstream of the valve chamber bypass pipeline, is used for providing and extending a trunk medium pressure relief channel, on one hand, enables the pressure relief point to be far away from the trunk line, avoids the influence of low temperature caused by the pressure relief medium on the upstream trunk line, on the other hand, reduces the using amount of the emptying low-pressure stainless steel pipeline on the premise of meeting the distance between an emptying torch and the valve chamber, and is convenient to implement the skid-. The branch pipe block valve 15 is installed at the tail section of the downstream of a buried bypass branch pipe and used for daily plugging, a double block system is formed by matching with the bypass block valve and is a ball valve, manually controlled and normally closed, and the double block system is opened when a valve chamber is released. The branch pipe replacement valve 16 is a manual ball valve made of carbon steel and is normally closed, is connected to the tail end of the bypass extension branch pipe 14 through a short pipe joint, and is used for injecting high-pressure nitrogen when the buried bypass branch pipe is put into use and performing combustible gas replacement after the operation is stopped. The branch pipe flanges 17 are made of carbon steel and are connected through blind flanges daily to plug the bypass extension branch pipes 14 and butt joint flanges 18 of the movable emptying system before emptying.
Wherein, the docking flange 18, the high-pressure hose 19, the blow-down regulating valve 20, the reducer 21, the blow-down pipeline 23, the flame arrester 24 and the blow-down torch 25 form a movable blow-down system, form a skid-mounted module, can be transported by a conventional truck on the road, are transported and connected in a planned blow-down mode in a main valve chamber, and carry out safe treatment on the blow-down ethane.
Specifically, the butt flange 18 is made of stainless steel, has the same pressure grade as the bypass extension branch 14, and is used for connecting the branch flange 17 at the tail end of the bypass extension branch system; the high-pressure hose 19 is a low-temperature-resistant flexible pipeline with the pressure grade not lower than that of the bypass extension branch pipe 14, provides compensation for the connection of the butt flange 18 and the branch pipe flange 17, is connected with the butt flange and the downstream regulating valve, is provided with a heating system, is used for reducing the upstream transmission of cold energy caused by the pressure reduction of the regulating valve, and is also convenient for the butt joint of the movable emptying system and an upstream fixed pipeline; the emptying adjusting valve 20 is an electric adjusting valve made of stainless steel, and the opening degree of the emptying adjusting valve is controlled by the temperature measuring result of the temperature transmitter and the pipeline on-way temperature measuring system, so that the effect of controlling the emptying amount is achieved; the reducer 21 and the emptying pipeline 23 which are arranged at the downstream of the emptying regulating valve are made of stainless steel materials; the emptying pipeline is provided with a flame arrester for preventing backfire, and the flame arrester 24 is made of stainless steel and is arranged at the tail end of the emptying pipeline 23; the flare 25 is disposed at the end of the system, is made of stainless steel, has an automatic ignition system, and is used for burning the released gaseous ethane.
In addition, a distributed temperature measuring optical fiber system arranged along the main pipeline and a temperature transmitter arranged in the valve chamber form a main temperature detection system which is used for continuously monitoring the on-way temperature of the pipeline in normal operation, identifying the leakage point of the pipeline, simultaneously detecting the temperature change caused by medium phase change and throttling effect due to main decompression in the relief process in real time, connecting a lock and a relief regulating valve in parallel and controlling the relief speed.
Meanwhile, the system also comprises a logic control system for realizing signal transmission, processing and valve control of the transmitter.
The utility model discloses a theory of operation and working process do:
(1) when the liquid ethane pipeline is normally transported, the movable emptying system is placed in a reserved site of a trunk valve chamber with 3-5 seats for radiation, the trunk block valve 2 is kept open, and the valve chamber bypass system is kept closed.
(2) Before the main pipeline needs emptying, the main cut-off valve 2 plays a role of cutting off the emptying unit; different with fixed unloading system of conventional valve chamber setting, the utility model discloses consider extreme low temperature behind the liquid ethane pressure release, can only adopt stainless steel's unloading system, consequently propose to set to the sled, can serve the portable unloading system of many departments valve chamber, transport the valve chamber that need carry out the blowdown through the vehicle with portable unloading system, with the butt joint of bypass extension branch pipe system, debug. The utility model discloses set up the replacement valve on other way extension system, the purpose is in portable unloading system and bypass extension system butt joint back, can fill into nitrogen gas to the bypass extension system that equals with upper reaches trunk pressure, so that bypass block valve 8 or 9 open the back, take place the pressure release temperature drop in avoiding bypass extension branch pipe system, also utilize at the unloading in-process, utilize the nitrogen gas in this section pipeline to form the front end gas, replace unloading system once more, avoid ethane unloading gas to burn in unloading pipeline.
(3) In the process of emptying the main line, two temperature reduction processes of phase change temperature reduction and pressure relief temperature reduction occur after the pressure of the liquid ethane is relieved, and the temperature of the downstream of an emptying regulating valve is lower than-80 ℃, so that a stainless steel material is selected as a discharge system; meanwhile, the temperature of the trunk line and the valve chamber pipeline at the upstream of the air release regulating valve is also influenced by the pressure release of the reserved medium, the release speed needs to be strictly controlled, and the parameters of the temperature detection system are monitored in real time, so that time is provided for the medium in the pipeline to fully exchange heat with the ambient environment, the temperature of the pipeline is prevented from being lower than the allowable operating temperature of the pipeline material, and the safety of the carbon steel material of the trunk line and the valve chamber system is ensured. Different from conventional valve chamber, the utility model discloses in, the valve chamber of liquid ethane pipeline has set up apart from longer bypass branch pipe system, and its purpose mainly is to provide and prolong the main line and take the pressure medium to release the passageway, makes the pressure release point keep away from the main line on the one hand, avoids the low temperature that the pressure release medium arouses to influence the upper reaches main line, and on the other hand is satisfying under the prerequisite of evacuation torch and valve chamber interval, reduces the quantity of unloading low pressure stainless steel pipeline, in addition, still be convenient for implement the system skid-mounted of unloading, avoid on-the-spot long distance pipe connection.
Utilize the utility model discloses a method that liquid ethane pipeline valve room relief system carries out safe relief, including following main content:
the method comprises the following steps: arranging a plurality of block valve chambers and temperature and pressure detecting instruments along the liquid ethane conveying pipeline; a distributed temperature measuring optical fiber system is arranged along the trunk line. The movable emptying systems (typically skid-mounted) are stored in fixed areas along the pipeline, and each set of movable emptying system can be flexibly responsible for emptying the 3-5 seat valve chambers on the periphery.
Step two: when the pipeline normally runs, the valve chamber trunk line block valve 2 is kept open, the valve chamber bypass block valve 7/8 and the buried bypass extension branch pipe block valve 15 are kept closed, and the branch pipe flange 17 is blindly plugged. Meanwhile, the movable emptying system is not connected into the valve chamber system.
Step three: before the pipeline needs to be stopped, the trunk line cut-off valves (in the example, the trunk line cut-off valve 2) at two ends of the trunk line pipe section corresponding to the required emptying are closed; and closing the pipeline all-line upstream and downstream production systems. The movable flare system is transported to the valve chamber at one end of the desired flare section ready for connection to the bypass extension leg system of that valve chamber.
Step four: opening replacement block valves 10 and 11 at the starting end of a bypass extension branch pipe 14, opening a buried bypass branch pipe block valve 15, opening a branch pipe replacement valve 16, introducing nitrogen to replace a bypass extension branch pipe system, wherein the replacement time is at least 10 min; after the replacement is finished, the blind flange of the branch pipe flange 17 is removed, the connecting flange 18 of the movable emptying system is connected, and the bypass branch pipe extension system and the movable emptying system are opened. Opening the pressure release valve 20, introducing nitrogen again from the displacement block valves 10 and 11, closing the branch pipe displacement valve 16, discharging the nitrogen from the upper part of the emptying torch 25, and allowing the displacement time to be at least 5 min; closing the branch shut-off valve 15 and the pressure relief valve 20, injecting nitrogen into the bypass extension branch pipe through the replacement shut-off valves 10 and 11, and increasing the pressure of a pipeline (the pipeline between the bypass shut-off valve and the movable emptying system regulating valve) to be equal to the main line pressure; the replacement block valves 10 and 11 are closed.
Step five: the trunk bypass block valve 8 (the side of the pipe section to be discharged) is opened, then the buried bypass branch pipe block valve 15 is opened, the discharge regulating valve 20 is slowly opened, the medium in the trunk enters the emptying system by pushing the nitrogen injected in advance, and the automatic ignition system continuously works until the emptying torch burns. And continuously recording and monitoring temperature and pressure parameters of all parts of the required emptying pipe section, and recording and monitoring parameters of the distributed temperature measurement optical fiber system. Controlling the opening degree of an emptying regulating valve and keeping the main line temperature monitoring parameter higher than-20 ℃; when the temperature is lower than minus 20 ℃, immediately reducing the opening degree of the emptying adjusting valve; when the temperature is lower than minus 25 ℃, the emptying adjusting valve is immediately closed so as to prevent the trunk pipeline and the buried bypass branch pipe from working conditions with pressure and low temperature.
Step six: and when the main line pressure monitoring value is close to the normal pressure, injecting nitrogen from a valve chamber bypass of the upstream pipe section, carrying out integral replacement of the emptying pipe section, and finishing the operation.
Through the steps, the system is operated, and the purpose of safely releasing the liquid ethane pipeline valve chamber is achieved.
Claims (8)
1. A liquid ethane pipeline valve chamber relief system which characterized in that: the system comprises a valve chamber main line system, a valve chamber bypass system, a bypass extension branch pipe system, a movable emptying system and a main line pipeline temperature detection system, wherein:
the valve chamber trunk line system comprises a valve chamber trunk line pipeline and a trunk line block valve arranged on the valve chamber trunk line pipeline, and the valve chamber trunk line pipeline is connected with an upstream buried trunk line and a downstream buried trunk line;
the valve chamber bypass system comprises an upstream bypass pipeline and a downstream bypass pipeline which form a closed loop, and a pressure transmitter, a temperature transmitter and a bypass block valve which are respectively arranged on the upstream bypass pipeline and the downstream bypass pipeline;
the bypass extension branch pipe system comprises a bypass branch pipe, a branch pipe block valve and a branch pipe flange, wherein the branch pipe block valve and the branch pipe flange are arranged on the bypass branch pipe;
the movable emptying system comprises an emptying pipeline, and a high-pressure hose, an emptying regulating valve, a reducer and an emptying torch which are sequentially arranged on the emptying pipeline, wherein a butt flange is arranged at the front end of the high-pressure hose;
the main pipeline temperature detection system comprises a distributed temperature measurement optical fiber system arranged along the main pipeline and a temperature measurement system arranged in the valve chamber.
2. The liquid ethane piping valve chamber relief system of claim 1, wherein: the main line block valve is an electric control full-bore ball valve and is normally open.
3. The liquid ethane piping valve chamber relief system of claim 1, wherein: the upstream bypass pipeline and the downstream bypass pipeline are made of carbon steel, are installed in an exposed manner and are respectively connected with the valve chamber trunk pipelines at the upstream and the downstream of the trunk block valve; the pressure transmitter and the temperature transmitter are close to the upstream trunk pipeline and the downstream trunk pipeline; the bypass block valve is a manual ball valve and is made of carbon steel and is normally closed.
4. The liquid ethane piping valve chamber relief system of claim 1, wherein: the bypass replacing valve is connected to the positions, close to the downstream of the bypass block valve, of the upstream bypass pipeline and the downstream bypass pipeline through a short section pipe, is a manual ball valve and is made of carbon steel and is normally closed.
5. The liquid ethane piping valve chamber relief system of claim 1, wherein: the bypass branch pipes are the same as the bypass pipelines at the upstream and the downstream in design pressure, pipe diameter and material, and are buried underground, and the distance between the starting point and the tail point is not less than 50 m; the branch pipe block valve is arranged at the tail section of the downstream of the bypass branch pipe and is a ball valve, and the branch pipe block valve is manually controlled and normally closed; the branch pipe flange is made of carbon steel.
6. The liquid ethane piping valve chamber relief system of claim 1, wherein: the tail end of the bypass branch pipe is connected with a branch pipe replacement valve through a short-section pipe, and the branch pipe replacement valve is a manual ball valve and made of carbon steel and is normally closed.
7. The liquid ethane piping valve chamber relief system of claim 1, wherein: the butt flange is made of stainless steel, and the pressure grade is consistent with that of the bypass branch pipe; the high-pressure hose is a low-temperature-resistant flexible pipeline with the pressure grade not lower than that of the bypass branch pipe, is used for connecting the butt flange and the emptying regulating valve, and is provided with a heating system; the emptying regulating valve is an electric regulating valve and is made of stainless steel; the reducer and the emptying pipeline are made of stainless steel materials; the emptying torch is made of stainless steel and is provided with an automatic ignition system; the butt flange, the high-pressure hose, the emptying pipeline, the reducer, the flame arrester and the emptying torch form a skid-mounted system which is movable.
8. The liquid ethane piping valve chamber relief system of claim 1, wherein: and a flame arrester is arranged at the tail end of the emptying pipeline, and the flame arrester is made of stainless steel.
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| CN201922228720.4U CN211344795U (en) | 2019-12-12 | 2019-12-12 | Liquid ethane pipeline valve chamber relief system |
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| CN201922228720.4U CN211344795U (en) | 2019-12-12 | 2019-12-12 | Liquid ethane pipeline valve chamber relief system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059471A (en) * | 2019-12-12 | 2020-04-24 | 中国石油工程建设有限公司 | Liquid ethane pipeline valve chamber relief system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059471A (en) * | 2019-12-12 | 2020-04-24 | 中国石油工程建设有限公司 | Liquid ethane pipeline valve chamber relief system and method |
| CN111059471B (en) * | 2019-12-12 | 2021-06-29 | 中国石油工程建设有限公司 | Liquid ethane pipeline valve chamber relief system and method |
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Effective date of registration: 20210225 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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