CN115371913A - Method for detecting high-pressure tightness of pipeline of natural gas regasification system of LNG-FSRU ship - Google Patents
Method for detecting high-pressure tightness of pipeline of natural gas regasification system of LNG-FSRU ship Download PDFInfo
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- CN115371913A CN115371913A CN202210825649.1A CN202210825649A CN115371913A CN 115371913 A CN115371913 A CN 115371913A CN 202210825649 A CN202210825649 A CN 202210825649A CN 115371913 A CN115371913 A CN 115371913A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a high-pressure tightness detection method for a natural gas regasification system pipeline of an LNG-FSRU ship.
Description
Technical Field
The invention belongs to the technical field of ship construction, and particularly relates to a method for detecting high pressure tightness of a pipeline of a natural gas regasification system of an LNG-FSRU ship.
Background
The LNG-FSRU (floating LNG storage and regasification unit) is a purpose-made device that integrates multiple functions of LNG receiving, storage, transfer, regasification and transportation, and has the function of an LNG carrier when equipped with a propulsion system.
A natural gas regasification system equivalent to the regasification capacity of a road-based gas station is arranged in a cargo compartment deck area of the LNG-FSRU ship and comprises a regasification vaporizer, a high integrity rapid cut-off system (HIPPS system), an external transportation metering unit, an ultrahigh pressure ESD valve and the like, more complex components are arranged, and the system is extremely high in working and testing pressure. The natural gas output pipeline passing through the booster pump and the vaporizer in the regasification module is called an LNG-FSRU ship natural gas regasification output pipe, the external air tightness pressure of the pipeline exceeds 255bar, the pipe diameter is large, the pipe system is long, the installation difficulty is high, the total energy of the system is extremely high during tightness, the tightness technical difficulty and the safety control difficulty are high, and great tests are provided for key links such as a tightness mode, a tightness safety scheme, process implementation control, a tightness inspection mode and the like.
The medium source of the high-pressure nitrogen tightness test of the existing ship system mostly adopts a 15Mpa nitrogen cylinder group commonly used in engineering, if the medium source is used for the test of the method, the pressure of the nitrogen cylinder group is lower than the test target pressure, the volume of the standard high-pressure nitrogen cylinder group conforming to the pressure grade is extremely small relative to the test target system, the time consumed for continuously inflating and pressurizing the system day and night is more than forty days, and personnel are required to enter a high-pressure warning area during the replacement and operation of the cylinder group, so that the medium source is difficult to be practically applied; the existing liquid nitrogen pressurization vaporization mode is mostly applied to roadbed equipment or a system, a liquid nitrogen tank car or a liquid nitrogen storage tank is hoisted by external force by a high crane after being loaded with liquid nitrogen, and if the pressurization equipment is arranged on a roadbed wharf, the problem of relative height change caused by the influence of tide between a ship deck and the wharf needs to be solved; the existing ship system high-pressure tightness test most commonly adopts a watertight form, however, system equipment such as an LNG-FSRU ship regasification vaporizer, a regasification output metering unit and the like have very strict requirements on the dew point and humidity of the system, and once the system enters water, internal core components are damaged, so that the actual application is difficult; the process control and inspection mode of the existing ship system external field tightness test generally requires personnel to participate in the field, according to the requirements of the classification society, the safety warning range corresponding to the pressure level of the LNG-FSRU ship natural gas regasification pipeline high pressure tightness exceeds 200 meters, the span range of the system per se exceeds 1000 square meters, the added warning area is equivalent to the whole ship range, most areas of a wharf are in the safety warning range, personnel cannot enter the system during the test, and the system also has pipeline ranges with different tightness pressure level requirements, so the existing mode cannot meet the test requirements, and a suitable solution needs to be found.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a high-pressure tightness detection method for a natural gas regasification system pipeline of an LNG-FSRU ship.
In order to achieve the purpose of the invention, the invention provides the following technical scheme:
a high-pressure tightness detection method for a natural gas regasification system pipeline of an LNG-FSRU ship comprises the following steps of:
the method comprises the following steps that firstly, a safety valve on a natural gas regasification system pipeline is broken blindly, a sensor root valve in the natural gas regasification system pipeline is closed, a test blind plate is installed at a check valve of an outlet of a high-pressure vaporizer on the natural gas regasification system pipeline, and all regasification instrument joints in the natural gas regasification system pipeline are fixed through anti-flashover pipe clamps;
a second step of installing a first tightness pressure gauge and a first tightness safety valve on a pipeline in a third regasification chain in the upstream pipeline, and installing a first tightness pressure range sensor on a pipeline of the third regasification chain connected with the overpressure protection valve; the first airtight pressure range sensor is connected with the remote control room and sends a transmission signal to the remote control room;
thirdly, respectively installing a second tightness pressure gauge and a second tightness safety valve at the tail end of an outlet of the downstream pipeline, and installing a second tightness pressure range sensor on a pipeline connected with the overpressure protection valve through the downstream pipeline; the second airtight pressure range sensor is connected with the remote control room and sends a transmission signal to the remote control room;
fourthly, attaching masking paper to the periphery of a part with a sealing leakage risk in a pipeline of the natural gas regasification system, wherein the part with the sealing leakage risk in the pipeline of the natural gas regasification system comprises all connecting flanges in the pipeline of the natural gas regasification system;
fifthly, installing a plurality of remote cameras in the natural gas regasification system pipeline and the nitrogen input module, wherein the remote cameras are connected with a remote control room and send transmission signals to the remote control room;
sixthly, connecting the liquid nitrogen input module with a natural gas regasification system pipeline; the nitrogen in the liquid nitrogen input module is remotely controlled by a remote control room to be transmitted to a pipeline of a natural gas regasification system;
seventhly, after the nitrogen in the liquid nitrogen input module is conveyed to a pipeline of a natural gas regasification system, controlling an overpressure protection valve by an upstream pipeline pressure curve and a downstream pipeline pressure curve generated by transmission signals transmitted to the remote control room by the first tightness pressure range sensor and the second tightness pressure range sensor in the remote control room, and closing the overpressure protection valve to detect the high pressure tightness of the downstream pipeline when the pressure of the downstream pipeline reaches the test pressure of the high pressure tightness of the pipeline;
eighthly, continuously conveying nitrogen to the upstream pipeline by the liquid nitrogen input module during high-pressure tightness detection of the downstream pipeline, and stopping conveying the nitrogen by the liquid nitrogen input module when the pressure of the upstream pipeline reaches the high-pressure tightness test pressure of the pipeline to detect the high-pressure tightness of the upstream pipeline;
and ninthly, after the upstream pipeline high-pressure tightness detection is finished, performing pressure relief on the pipeline of the natural gas regasification system, and after the pressure relief of the pipeline of the natural gas regasification system is finished, separating the liquid nitrogen input module from the pipeline of the natural gas regasification system to finish the natural gas regasification system pipeline high-pressure tightness detection.
The anti-flying-shooting pipe clamp in the first step is made of porous angle steel nylon.
The remote control cameras in the fifth step are respectively and specifically arranged in a second airtight safety valve region, an external output metering unit component connecting region, an external board monitoring part region of an overpressure protection valve connecting part, a first airtight pressure gauge region, a third regasification chain process pipeline high-pressure component connecting region, a second airtight pressure gauge region, a sewer pipeline metering unit, a second airtight pressure range sensor region, an internal board monitoring part region of the overpressure protection valve connecting part, a first airtight pressure range sensor region, a regasification suction tank stern process pipeline high-pressure component connecting region, a regasification suction tank bow process pipeline high-pressure component connecting region, a first regasification chain process pipeline high-pressure component connecting region, a second regasification chain process pipeline high-pressure component connecting region, a ship-boarding tooling pipeline on-board connecting region, a high-pressure vaporizer outlet pressure gauge region, a booster pump region and a liquid nitrogen tank truck liquid supply region.
The remote control camera arranged in the second airtight safety valve region also monitors the connecting part region of the regasified high-voltage ESD valve component; the remote control camera arranged in the first airtight pressure gauge region also monitors the region of the connecting part of the high-pressure component of the third regasification chain; and the remote control camera arranged in the area of the pressure gauge at the outlet of the high-pressure vaporizer also monitors the area of the airtight safety valve and the release remote control valve.
The liquid nitrogen input module in the sixth step comprises a liquid nitrogen tank truck, a booster pump, a high-pressure vaporizer, a high-pressure hose, a boarding tool pipeline and a high-pressure air bag; a nitrogen outlet of the liquid nitrogen tank truck is provided with a liquid nitrogen switch, the liquid nitrogen tank truck is placed in a liquid supply area of the liquid nitrogen tank truck, and the liquid nitrogen tank truck is connected with the booster pump; the booster pump is provided with a booster pump switch and is connected with the high-pressure vaporizer; the high-pressure vaporizer is connected with the boarding tool pipeline through a high-pressure hose; the boarding tool pipeline is connected with a high-pressure air bag, and the high-pressure air bag is connected with a blow-washing pipe interface in the first regasification chain; the output end of the high-pressure vaporizer is provided with a sealing safety valve and a discharge remote control valve; the liquid nitrogen switch, the booster pump switch and the discharge remote control valve are remotely controlled through a remote control chamber; the liquid nitrogen input module is arranged at the wharf.
The boarding tool pipeline is fixedly connected with the ship body through the fixing support, the inclined stay ropes are arranged on the boarding tool pipeline and respectively connected with the head end and the tail end of the boarding tool pipeline, and the included angle between the inclined stay ropes and a horizontal line is 45 degrees.
The remote control chamber is provided with a solenoid valve remote control switch, a controller switch and a camera switch, the solenoid valve remote control switch controls the opening and closing of a solenoid valve, and the solenoid valve is arranged in the overpressure protection valve; the controller switch respectively controls the opening and closing of the liquid nitrogen switch, the booster pump switch and the discharge remote control valve; the camera shooting switch controls remote control cameras arranged in the natural gas regasification system pipeline and the nitrogen input module.
The closing of the overpressure protection valve in the seventh step specifically comprises the following steps: when the pressure of the downstream pipeline reaches the test pressure of high-pressure tightness of the pipeline, the electromagnetic valve is powered off through the electromagnetic valve remote control switch of the remote control room, and after the electromagnetic valve is powered off, the overpressure protection valve is automatically closed.
The test pressure of the downstream pipeline is 18.8Mpa, and the test pressure of the upstream pipeline is 25.5Mpa.
The specific step of releasing the pipeline pressure of the natural gas regasification system in the ninth step is as follows: after the high-pressure tightness detection of the pipeline of the natural gas regasification system is completed, the remote control room opens 5% of the opening of the remote control relief valve through a controller switch to perform nitrogen relief, and when the pressure of the upstream pipeline is reduced by 20bar every time, the opening of the remote control relief valve is opened by 10%; when the pressure in the upstream pipeline is reduced to be the same as that of the downstream pipeline, the remote control chamber energizes the electromagnetic valve through the electromagnetic valve remote control switch, so that the overpressure protection valve is automatically opened to communicate the upstream pipeline with the downstream pipeline; and when the pressure in the natural gas regasification system pipeline is released to be below 80bar, fully opening the opening degree of the release remote control valve to complete the pressure release of the natural gas regasification system pipeline.
Based on the technical scheme, the method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship obtains the following technical advantages through practical application:
1. according to the method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship, the nitrogen input module is arranged at the wharf, so that the danger of tightness detection after a liquid nitrogen tank needs to be adjusted to be high is avoided, meanwhile, the high-pressure hose arranged in the nitrogen input module is connected with the pipeline of the boarding tool, the risk of nitrogen input leakage caused by the change of the relative height of the ship and the nitrogen input module due to the tidal phenomenon of seawater is avoided, and the safety of the high-pressure tightness detection of the pipeline of the natural gas regasification system is improved.
2. According to the method for detecting the high-pressure tightness of the natural gas regasification system pipeline of the LNG-FSRU ship, nitrogen is input through the liquid nitrogen tank car, and is pressurized through the booster pump, so that the nitrogen input of the nitrogen cylinder group is replaced, the nitrogen input speed is increased, and the period of detecting the high-pressure tightness of the natural gas regasification system pipeline is shortened.
3. According to the method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship, the tightness pressure gauge, the tightness safety valve and the tightness pressure range sensor are arranged on the upstream pipeline and the downstream pipeline, and the safety of high-pressure tightness detection is improved by remotely controlling the high-pressure tightness detection of the pipeline of the natural gas regasification system.
4. According to the method for detecting the high-pressure tightness of the natural gas regasification system pipeline of the LNG-FSRU ship, the tightness is detected by using the nitrogen instead of the water tightness, so that the corrosion and the damage to the pipeline element of the natural gas regasification system in the water tightness process are avoided, and the service life of the natural gas regasification system pipeline is prolonged.
Drawings
Fig. 1 is a distribution diagram for detecting high-pressure tightness of a pipeline of a natural gas regasification system in an shipboard area in a method for detecting high-pressure tightness of a pipeline of a natural gas regasification system of an LNG-FSRU ship according to the present invention.
FIG. 2 is a diagram showing the distribution of nitrogen input modules used in the method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship according to the present invention.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will now be described by way of example only, as illustrated in the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The invention belongs to a method for detecting the high-pressure tightness of a natural gas regasification system pipeline of an LNG-FSRU ship, wherein the natural gas regasification pipeline comprises an upstream pipeline 74 and a downstream pipeline 75, the upstream pipeline 74 and the downstream pipeline 75 are connected through an overpressure protection valve, and the upstream pipeline 74 comprises a first regasification chain, a second regasification chain and a third regasification chain.
As shown in fig. 1-2, a method for detecting high pressure tightness of a pipeline of a natural gas regasification system for an LNG-FSRU ship specifically includes the steps of:
the method comprises the following steps that firstly, a safety valve on a natural gas regasification system pipeline is broken blindly, a sensor root valve in the natural gas regasification system pipeline is closed, a test blind plate is installed at an outlet check valve of a high-pressure vaporizer 53 on the natural gas regasification system pipeline, and all regasification instrument joints in the natural gas regasification system pipeline are fixed through anti-flashover pipe clamps;
a second step of installing a first airtight pressure gauge 22 and a first airtight safety valve 32 on a pipe in a third regasification chain among the upstream pipes 74, and installing a first airtight pressure range sensor 42 on a pipe in the third regasification chain connected to the overpressure protection valve; the first airtight pressure range sensor 42 is connected with a remote control room, and the first airtight pressure range sensor 42 sends a transmission signal to the remote control room 6;
thirdly, respectively installing a second airtight pressure gauge 21 and a second airtight safety valve 31 at the outlet end of the downstream pipeline 75, and installing a second airtight pressure range sensor 41 on the pipeline where the downstream pipeline 75 is connected with the overpressure protection valve; the second airtight pressure range sensor 41 is connected with a remote control room, and the second airtight pressure range sensor 41 sends a transmission signal to the remote control room 6;
fourthly, attaching masking paper to the periphery of a part with a sealing leakage risk in a pipeline of the natural gas regasification system, wherein the part with the sealing leakage risk in the pipeline of the natural gas regasification system comprises all connecting flanges in the pipeline of the natural gas regasification system;
fifthly, installing a plurality of remote cameras in a pipeline of the natural gas regasification system and a nitrogen input module, wherein the remote cameras are connected with a remote control room 6 and send transmission signals to the remote control room 6;
sixthly, connecting the liquid nitrogen input module 5 with a natural gas regasification system pipeline; the nitrogen in the liquid nitrogen input module 5 is remotely controlled by a remote control chamber 6 to be transmitted to a pipeline of a natural gas regasification system;
seventhly, after the nitrogen in the liquid nitrogen input module 5 is conveyed to a pipeline of a natural gas regasification system, controlling an overpressure protection valve on an upstream pipeline 74 pressure curve and a downstream pipeline 75 pressure curve generated by transmission signals transmitted to the remote control room 6 by the remote control room 6 through the first tightness pressure range sensor 42 and the second tightness pressure range sensor 41, and when the pressure of the downstream pipeline 75 reaches a pipeline high-pressure tightness test pressure, closing the overpressure protection valve to detect the high-pressure tightness of the downstream pipeline 75;
eighthly, the liquid nitrogen input module 5 continues to convey nitrogen to the upstream pipeline 74 when the high-pressure tightness of the downstream pipeline 75 is detected, and when the pressure of the upstream pipeline reaches the test pressure of the high-pressure tightness of the pipeline, the nitrogen conveying of the liquid nitrogen input module 5 is stopped, and the high-pressure tightness of the upstream pipeline 74 is detected;
and ninthly, after the high-pressure tightness detection of the upstream pipeline 74 is finished, performing pressure relief of the pipeline of the natural gas regasification system, and after the pressure relief of the pipeline of the natural gas regasification system is finished, separating the liquid nitrogen input module 5 from the pipeline of the natural gas regasification system to finish the high-pressure tightness detection of the pipeline of the natural gas regasification system.
The anti-flying-shooting pipe clamp in the first step is made of porous angle steel nylon.
The remote cameras in the fifth step are specifically arranged in a second airtight safety valve 31 region, an external transportation metering unit component connection region 12, an overpressure protection valve connection part outboard monitoring region 13, a first airtight pressure gauge 22 region, a third regasification chain process pipeline high-pressure component connection region 15, a second airtight pressure gauge region, a downcomer pipeline metering unit region 17, a second airtight pressure range sensor region 18, an overpressure protection valve connection part inboard monitoring region 19, a first airtight pressure range sensor region 110, a regasification suction tank stern process pipeline high-pressure component connection region 111, a regasification suction tank bow process pipeline high-pressure component connection region 112, a first regasification chain process pipeline high-pressure component connection region 113, a second regasification chain process pipeline high-pressure component connection region 114, a boarding tool pipeline onboard connection region 115, a high-pressure vaporizer outlet pressure gauge 56 region, a booster pump region 117, and a liquid nitrogen tank car region 118, respectively.
The remote camera installed in the area of the second safety valve 31 also monitors the re-gasification high-voltage ESD valve unit connection area 11; the remote control camera arranged in the area of the first airtight pressure gauge 22 also monitors the area 14 of the connecting part of the high-pressure component of the third regasification chain; the remote camera mounted in the area of the high pressure vaporizer outlet pressure gauge 56 also monitors the area 116 of the leak-tight safety valve and the bleed remote control valve.
The liquid nitrogen input module 5 in the sixth step comprises a liquid nitrogen tank truck 51, a booster pump 52, a high-pressure vaporizer 53, a high-pressure hose 54, a boarding tool pipeline 55 and a high-pressure air bag 58; a nitrogen outlet of the liquid nitrogen tank truck 51 is provided with a liquid nitrogen switch 64, the liquid nitrogen tank truck 51 is placed in a liquid supply area 118 of the liquid nitrogen tank truck, and the liquid nitrogen tank truck 51 is connected with the booster pump 52; the booster pump 52 is provided with a booster pump switch 65, and the booster pump 52 is connected with the high-pressure vaporizer 53; the high-pressure carburetor 53 is connected with the boarding tool pipeline 55 through a high-pressure hose 54; the boarding tool pipeline 55 is connected with a high-pressure air bag 58, and the high-pressure air bag 58 is connected with a blow-washing pipe interface in the first regasification chain; the output end of the high-pressure carburetor 53 is provided with a sealing safety valve 57 and a discharging remote control valve 66; the liquid nitrogen switch 64, the booster pump switch 65 and the discharge remote control valve 66 are remotely controlled by a remote control chamber 6; the liquid nitrogen input module 5 is arranged at the wharf; the nitrogen input module is arranged at a wharf, so that the risk of tightness detection after a liquid nitrogen tank needs to be adjusted to a high level is avoided, meanwhile, the high-pressure hose 54 arranged in the nitrogen input module is connected with the boarding tool pipeline 55, the risk of nitrogen input leakage caused by relative height change of a ship and the nitrogen input module due to seawater tide phenomenon is avoided, and the safety of high-pressure tightness detection of a natural gas regasification system pipeline is improved.
The boarding tool pipeline 55 is fixedly connected with the ship body through a fixing support, a diagonal rope is arranged on the boarding tool pipeline 55, the diagonal rope is respectively connected with the head end and the tail end of the boarding tool pipeline 55, and the included angle between the diagonal rope and the horizontal line is 45 degrees.
The remote control chamber is provided with a solenoid valve remote control switch 63, a controller switch 61 and a camera switch 62, the solenoid valve remote control switch 63 controls the opening and closing of a solenoid valve, and the solenoid valve is arranged in the overpressure protection valve; the controller switch 61 controls the liquid nitrogen switch 64, the booster pump switch 65 and the discharge remote control valve 66 to be opened and closed respectively; the camera switch 62 controls remote cameras arranged in the natural gas regasification system pipeline and the nitrogen input module.
The closing of the overpressure protection valve in the seventh step specifically comprises the following steps: when the pressure of the downstream pipeline 75 reaches the pipeline high-pressure tightness test pressure, the electromagnetic valve is powered off through the electromagnetic valve remote switch 63 of the remote control room, and after the electromagnetic valve is powered off, the overpressure protection valve is automatically closed.
The test pressure of the downstream line 75 is 18.8Mpa, and the test pressure of the upstream line 74 is 25.5Mpa.
The concrete steps of the pipeline pressure relief of the natural gas regasification system in the ninth step are as follows: after the high-pressure tightness detection of the pipeline of the natural gas regasification system is completed, the remote control room opens the opening of the remote control relief valve 66 by 5% through the controller switch 61 to perform nitrogen relief, and when the pressure of the upstream pipeline 74 is reduced by 20bar every time, the opening of the remote control relief valve 66 is opened by 10%; when the pressure in the upstream pipeline 74 is reduced to be the same as the pressure in the downstream pipeline 75, the remote control chamber energizes the solenoid valve through the solenoid valve remote switch 63, so that the overpressure protection valve is automatically opened to communicate the upstream pipeline 74 and the downstream pipeline 75; when the pressure in the natural gas regasification system pipeline is released to be below 80bar, the opening degree of the release remote control valve 66 is fully opened to complete the pressure release of the natural gas regasification system pipeline.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will appreciate that; modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A method for detecting high-pressure tightness of a pipeline of a natural gas regasification system of an LNG-FSRU ship, wherein the natural gas regasification pipeline comprises an upstream pipeline (74) and a downstream pipeline (75), the upstream pipeline (74) and the downstream pipeline (75) are connected through an overpressure protection valve, the upstream pipeline (74) comprises a first regasification chain, a second regasification chain and a third regasification chain, and the method is characterized by comprising the following steps:
the method comprises the following steps that firstly, a safety valve on a natural gas regasification system pipeline is broken blindly, a sensor root valve in the natural gas regasification system pipeline is closed, a test blind plate is installed at an outlet check valve of a high-pressure vaporizer 53 on the natural gas regasification system pipeline, and all regasification instrument joints in the natural gas regasification system pipeline are fixed through anti-flashover pipe clamps;
a second step of installing a first airtight pressure gauge (22) and a first airtight safety valve (32) on a pipe in a third regasification chain among the upstream pipes (74), and installing a first airtight pressure range sensor (42) on a pipe in the third regasification chain connected to the overpressure protection valve; the first airtight pressure range sensor (42) is connected with a remote control room, and the first airtight pressure range sensor (42) sends a transmission signal to the remote control room (6);
thirdly, respectively installing a second airtight pressure gauge (21) and a second airtight safety valve (31) at the outlet tail end of the downstream pipeline (75), and installing a second airtight pressure range sensor (41) on the pipeline of the downstream pipeline (75) connected with the overpressure protection valve; the second airtight pressure range sensor (41) is connected with a remote control room, and the second airtight pressure range sensor (41) sends a transmission signal to a remote control room (6);
fourthly, pasting masking paper on the periphery of a part with tightness leakage risk in a pipeline of the natural gas regasification system, wherein the part with tightness leakage risk in the pipeline of the natural gas regasification system comprises all connecting flanges in the pipeline of the natural gas regasification system;
fifthly, installing a plurality of remote control cameras in the natural gas regasification system pipeline and the nitrogen input module, wherein the remote control cameras are connected with a remote control room (6), and the remote control cameras send transmission signals to the remote control room (6);
sixthly, connecting the liquid nitrogen input module (5) with a natural gas regasification system pipeline; the nitrogen in the liquid nitrogen input module (5) is remotely controlled by a remote control chamber (6) to be transmitted to a pipeline of a natural gas regasification system;
seventhly, after the nitrogen in the liquid nitrogen input module (5) is conveyed to a pipeline of a natural gas regasification system, controlling an overpressure protection valve on an upstream pipeline (74) pressure curve and a downstream pipeline (75) pressure curve generated by transmission signals transmitted to the remote control room (6) by the remote control room (6) through the first tightness pressure range sensor (42) and the second tightness pressure range sensor (41), and closing the overpressure protection valve when the pressure of the downstream pipeline (75) reaches a pipeline high-pressure tightness test pressure to detect the high-pressure tightness of the downstream pipeline (75);
eighthly, when the high-pressure tightness of the downstream pipeline (75) is detected, the liquid nitrogen input module (5) continues to convey nitrogen to the upstream pipeline (74), and when the pressure of the upstream pipeline reaches the high-pressure tightness test pressure of the pipeline, the nitrogen conveying of the liquid nitrogen input module (5) is stopped, and the high-pressure tightness of the upstream pipeline (74) is detected;
and ninthly, after the high-pressure tightness detection of the upstream pipeline (74) is finished, performing pressure relief on the pipeline of the natural gas regasification system, and after the pressure relief of the pipeline of the natural gas regasification system is finished, separating the liquid nitrogen input module (5) from the pipeline of the natural gas regasification system to finish the high-pressure tightness detection of the pipeline of the natural gas regasification system.
2. The method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship according to claim 1, wherein the anti-flying pipe clamp in the first step is made of porous angle steel nylon.
3. The method for detecting the high pressure tightness of the pipeline of the natural gas regasification system for the LNG-FSRU ship according to claim 1, wherein the remote cameras in the fifth step are specifically arranged in a second safety valve tightness (31) region, an export metering unit component connection region (12), an overpressure protection valve connection outboard monitor region (13), a first pressure gauge (22) region, a third regasification train process pipeline high pressure component connection region (15), a second pressure gauge region (16), a downcomer pipeline metering unit region (17), a second pressure gauge sensor region (18), an overpressure protection valve connection inboard monitor region (19), a first pressure gauge sensor region (110), a regasification suction canister stern process pipeline high pressure component connection on-board region (111), a regasification tank suction head process pipeline high pressure component connection region (112), a first regasification train process pipeline high pressure component connection region (113), a second regasification train process pipeline high pressure component region (114), a ship-boarding tool pipeline connection region (115), a regasification vessel exit port region (56), a liquid nitrogen tank exit tank region (118), and a liquid nitrogen booster pump tank connection region (118), respectively.
4. The method for detecting high pressure tightness of pipeline of natural gas regasification system for LNG-FSRU ship according to claim 3, wherein the remote control camera installed in the area of the second tightness safety valve (31) also monitors the regasification high pressure ESD valve part connection area (11); the remote control camera arranged in the area of the first airtight pressure gauge (22) also monitors the area (14) of the connection part of the high-voltage component of the third regasification chain; the remote camera mounted in the region of the high pressure vaporizer outlet pressure gauge (56) also monitors the region of the safety valve and the bleed remote control valve (116).
5. The method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship according to claim 1, wherein the liquid nitrogen input module (5) in the sixth step comprises a liquid nitrogen tank car (51), a booster pump (52), a high-pressure vaporizer (53), a high-pressure hose (54), a boarding tool pipeline (55) and a high-pressure air bag (58); a nitrogen outlet of the liquid nitrogen tank truck (51) is provided with a liquid nitrogen switch (64), the liquid nitrogen tank truck (51) is placed in a liquid supply area (118) of the liquid nitrogen tank truck, and the liquid nitrogen tank truck (51) is connected with the booster pump (52); the booster pump (52) is provided with a booster pump switch (65), and the booster pump (52) is connected with the high-pressure vaporizer (53); the high-pressure vaporizer (53) is connected with the boarding tool pipeline (55) through a high-pressure hose (54); the boarding tool pipeline (55) is connected with a high-pressure air bag (58), and the high-pressure air bag (58) is connected with a blow-wash pipe interface in the first regasification chain; the output end of the high-pressure carburetor (53) is provided with a sealing safety valve (57) and a discharge remote control valve (66); the liquid nitrogen switch (64), the booster pump switch (65) and the discharge remote control valve (66) are remotely controlled through a remote control chamber (6); the liquid nitrogen input module (5) is arranged at the wharf.
6. The method for detecting the high pressure tightness of the LNG-FSRU ship natural gas regasification system pipeline according to claim 5, wherein the boarding tool pipeline (55) is fixedly connected with a ship body through a fixing support, inclined pull ropes are arranged on the boarding tool pipeline (55), the inclined pull ropes are respectively connected with the head end and the tail end of the boarding tool pipeline (55), and an included angle between each inclined pull rope and a horizontal line is 45 degrees.
7. The method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship according to claim 1, wherein the remote control room is provided with a solenoid valve remote control switch (63), a controller switch (61) and a camera switch (62), the solenoid valve remote control switch (63) controls the opening and closing of a solenoid valve, and the solenoid valve is arranged in the overpressure protection valve; the controller switch (61) controls the liquid nitrogen switch (64), the booster pump switch (65) and the discharge remote control valve (66) to be opened and closed respectively; and the camera switch (62) controls remote control cameras arranged in the natural gas regasification system pipeline and the nitrogen input module.
8. The method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship as claimed in claim 1, wherein the closing of the overpressure protection valve in the seventh step comprises the following specific steps: when the pressure of the downstream pipeline (75) reaches the test pressure of the high-pressure tightness of the pipeline, the electromagnetic valve is powered off through an electromagnetic valve remote control switch (63) of the remote control room, and after the electromagnetic valve is powered off, the overpressure protection valve is automatically closed.
9. The method for detecting the high pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU vessel as claimed in claim 1, wherein the downstream pipeline (75) has a test pressure of 18.8MPa and the upstream pipeline (74) has a test pressure of 25.5MPa.
10. The method for detecting the high-pressure tightness of the pipeline of the natural gas regasification system of the LNG-FSRU ship as claimed in claim 1, wherein the step nine comprises the specific steps of: after the high-pressure tightness detection of the pipeline of the natural gas regasification system is finished, the remote control room opens 5% of the opening of the release remote control valve (66) through the controller switch (61) to release nitrogen, and when the pressure of the upstream pipeline (74) is reduced by 20bar every time, the opening of the release remote control valve (66) is opened by 10%; when the pressure in the upstream pipeline (74) is reduced to be the same as the pressure in the downstream pipeline (75), the remote control chamber energizes the solenoid valve through the solenoid valve remote control switch (63) to enable the overpressure protection valve to be automatically opened to communicate the upstream pipeline (74) and the downstream pipeline (75); when the pressure in the natural gas regasification system pipeline is released to be below 80bar, the opening degree of the release remote control valve (66) is fully opened to complete the pressure release of the natural gas regasification system pipeline.
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