Some standard content:
Test Methods for Leakage Detection in Pipeline and TankSY/ T 4080-95
Editor: China Petroleum and Natural Gas Pipeline Engineering Company No. 2 Approval Department: China National Petroleum Corporation Petroleum Industry Press
1995 Beijing
Usage Standard
Method for pipeline leakage detection
Method for welded steel pipe leakage detection
Method for socket pipe leakage detection
Method for storage tank leakage detection
Method for tank bottom leakage detection
Method for male wall leakage detection
Method for arch tank leakage detection
Method for floating roof cabin leakage detection
Method for floating roof single plate leakage detection
Method for removing double plates of floating roof*
Method for central drainage pipe leakage detection·
Leak detection method for reinforcement plate of medullary wall opening
Appendix A Format of test record for leakage inspection of pipelines and storage tanks Appendix B Explanation of terms used in this specification
Additional explanation·
Explanation of clauses for leakage detection method for pipelines and storage tanks…Appendix
(17）
(18）
(20）
Document of China National Petroleum Corporation
(95) CNPC Technical Supervision No. 156
Notice on the approval and release of eleven oil and gas industry standards including "Safety Regulations for Heating Furnaces for Petroleum Industry" Congratulations to relevant units
Eleven standards (drafts) including "Safety Regulations for Heating Furnaces for Petroleum Industry" have been approved and are now approved as oil and gas industry standards for release. The numbers and names of the standards are as follows:
SY 0031—95
SY T 008695
SY/ T 4074-95
SY / T 4075---95
SY/ T 4076-95
SY/T 4077—95
Safety regulations for heating furnaces used in the petroleum industry (replacing SYJ 31-88)
Electrical insulation standards for cathodic protected pipelines
Mechanical coating technology for cement mortar lining of steel pipelines
Centrifugal molding construction technology for fly ash cement mortar lining of steel pipelines
Pneumatic extrusion coating technology for liquid coating inner coating of steel pipelines
Pneumatic extrusion coating technology for cement mortar lining of steel pipelines
SY/T 4078-95
SYT 4079-95
SY 7 T 4080-95
SY 4081-95
SY T 4082--95
Liquid coating patching machine patching process for internal coating of steel pipelines
Specifications for construction and acceptance of petroleum and natural gas pipeline crossing projects
Road, tank leakage detection method
Technical standard for anti-cyst identification of steel spherical tanksSpecifications for construction and acceptance of gas field well site equipment and pipeline installation projects
The above standards shall come into force on September 1, 1995. China National Petroleum Corporation
March 11, 1995
1 General Principles
1.01 This test is applicable to the leakage detection of welds (or sockets) of circular and cylindrical steel storage tanks for transporting oil, natural gas, water and other media. It can also be used as a reference for leakage detection of other steel atmospheric pressure storage tanks and containers. 1.0.2 The leakage detection method used for construction acceptance should be the method specified in the design. If there is no clear specification in the design, the method recommended in this standard can be used. Other parts not mentioned in this standard can be referred to for implementation of relevant industry standards, specifications and regulations. 2.0.1
Referenced standards
SYJ400190 Specification for construction and acceptance of long-distance pipeline line projectsSYJ4002-90 Specification for construction and acceptance of process pipeline projects within long-distance pipeline stations2.0.2
GBJ235--82 Specification for construction and acceptance of industrial pipeline projectsCECS19-90 Standard for airtightness inspection of concrete drainage pipeline projectsGBJ128--90 Specification for construction and acceptance of vertical cylindrical steel welded oil tanksSYJ4012-87 Specification for construction and acceptance of vertical cylindrical steel welded vaulted storage chains
Methods for pipeline leakage detection
3.1 Leakage detection method for welded steel pipes
Kerosene leak test.
3.1.1.1 Scope of application: This method is applicable to pipelines with a diameter of more than 1000 mm. 3.1.1.2 Test equipment: polisher, wire brush, cotton yarn, kerosene, white powder slurry, brush, thermometer.
Test conditions:
(1) Pipeline welds are qualified by external gauge and non-photographic inspection: (2) Before anti-corrosion and thermal insulation work. 3.1.1.4 Test steps
(1) First clean the inside and outside of the pipeline weld to remove splashes. Weld nodules, etc., and then use a wire brush to clean the inner and outer welds and the surfaces on both sides (about 100m cut): Finally, use cotton yarn to clean the weld:
(2) Use a brush to apply white powder slurry on the outside of the cleaned weld; (3) After the white powder slurry is completely dry, apply kerosene inside the weld (4) Check the outer surface of the weld. When the temperature is above 0℃, check after 0.5h: when the temperature is below ℃, check after 1h.
3.1.1.5 Qualification judgment: The outer surface of the weld is qualified if there is no kerosene mark. 3.1.1.6 The test record should include the following main contents 1 Project name:
Starting and ending locations;
Pipeline, material, pipe diameter, pipe mouth number, pile number: The format of the test report can refer to Table A-1. 3.1.2 Water pressure leak test inspection.
3.1.2.1 Scope of application
This method is applicable to the leakage detection of process pipelines, long-distance transmission and gathering pipelines. 3.1.2.2 Test equipment and instruments
Two pressure gauges, the accuracy level of which shall not be lower than level 1.5, and the full scale value of the dial shall be 15 times the maximum test pressure, and shall have passed the calibration and be within the prescribed service life;
Water pressure pump, with a flow rate of 300n3/h
Pressure test vehicle;
Water supply and pressure test pipelines, valves, pipe fittings, etc. 3.1.2.3 Test preparation and conditions:
(1) When testing the long-distance transmission line in sections, the sections are generally 1015km long, and the natural height difference of each section shall not be greater than 30m
(2) Install high-point evacuation and low-point drain valves. (3) Close or use insulation plates to separate systems, valves, equipment, pipe fittings and instruments that are not related to the test or cannot be tested. (4) The test medium should be clean water with a temperature not lower than 5°C. (5) When the temperature is below 0°C for water pressure test, anti-freezing measures must be taken. 3.1.2.4 Process pipeline test.
() Test steps:
The pressure test system is connected to the water source and the pipeline is filled with water
b. The pressure should rise slowly. After reaching the strength test pressure, stop increasing the pressure. c. After stabilizing the pressure for 10 minutes, conduct a comprehensive inspection of the pipeline. There should be no leakage and deformation
After checking that there is no leakage and deformation in the pipeline, the strength test pressure can be reduced to the working pressure, stabilize the pressure at 301, and check the pipeline for leakage: e. If leakage is found in the weld during the test, it should be marked in time. And carry out weld repair and weld inspection after pressure relief: It is strictly forbidden to use caulking method and pressure repair: f test qualified, timely release water, use shrinkage to sweep the line, and drain the residual water inside the line.
(2) Qualification judgment: National test without leakage is qualified. (3) The test record should include the following main contents: project name,
starting and ending locations, starting and ending times
steel pipe specifications;
working pressure;
strength and severity test force
test medium;
test process and results:
conclusion:
the format of the test report can refer to Table A-2
3.1.2.5: Long-distance and gathering pipeline test. (1) Test steps
. Open the vent valves at high points along the pipeline: fill the pipeline with water, and close the vent valve in time when there is water overflow:
b. The pressure increase process should be slow: first increase the pressure to 1/3 of the strength test pressure: stop the pressure for 15 minutes, then increase the pressure to 2/3 of the strength test pressure and stop the pressure for 15 minutes: c. Finally, increase the pressure to the strength test pressure, stabilize the pressure for 4 hours, and carefully check the sleeve. The pressure drop should not be greater than 1% of the test pressure:
d. Reduce the pressure from the strength test pressure to the working pressure: stabilize the pressure for 24 hours, and conduct leakage inspection:
C.During the pressure stabilization period, the pipeline should be fully inspected. If leakage is found, it should be marked and handled immediately after the pressure is reduced. After the treatment, the test should be repeated until it is qualified: f After the test is qualified, the water should be drained and emptied in time: During the winter test, measures should be taken to purge the pipeline.
(2) Qualification judgment: During the 24-hour pressure stabilization period: The pressure drop is not more than 1% of the test pressure.
7 (3) The test record should comply with the provisions of 3,1.2.4 (3). 3.1.2.6 Inter-station pipeline test.
1) Test steps:
a, open the vent valves at each high point along the pipeline, fill the pipeline with water, and close the vent valve in time when there is water overflow
b After the pipeline is filled, slowly increase the pressure. After reaching the working pressure, stabilize the pressure for 24 hours: conduct a leak test.
(2) Qualification judgment:
During the pressure stabilization period, the pressure drop is no more than 1% of the test pressure. (3) The test record shall comply with the provisions of 3.1.2.4 (3). 3.1.3 Air pressure leak test.
3.1.3.1 Scope of application
This method is applicable to the net leak detection of process pipelines, long-distance transmission and gathering pipelines. 3.1.3.2 Test equipment. Instruments:
Two pressure gauges, the accuracy level shall not be lower than level 1, the dial diameter shall not be less than 150mm:, the minimum scale shall not be greater than 0.02MP per grid, the full scale value of the pressure gauge shall be 1.5 to 2 times the maximum test pressure; and shall be calibrated and qualified, and within the specified service life;
Air compressor; bzxZ.net
Safety pressure relief valve;
Thermometer;
Test pressure pipeline, valves, pipe fittings, etc.
3.1.3.3 Test preparation and conditions:
(1) Take effective safety measures: and report to the competent department for approval: (2) The thermometer should be installed in a place without direct sunlight (3) Shut down or isolate systems, valves, equipment, instruments, etc. that are not related to the test or cannot be tested.
(4) The test medium should generally be dry and clean air or other inert gas: 3.1.3.4 Process pipeline air pressure test.
(1) Test steps:
a. After all preparations and test equipment are confirmed to be correct, set up safety signs to mark the warning area:
b .Start the air compressor, the test pressure should be increased slowly and evenly in sections. For pipelines with working pressure less than 0.6MPa, the pressure should be increased to 0.5 times the test pressure first, and then to the test pressure; for pipelines with working pressure greater than 0.6MPa, the pressure should be increased to 0.3 and 0.6 times the test pressure respectively:
?Finally, it should be increased to the strength test pressure: Check the pipeline, there should be no leakage and d. Reduce the test pressure to the working pressure,
e, apply a certain concentration of soapy water foaming liquid to the inspection part, and check after stabilizing the pressure for 30 minutes;
f During the test, if there is a leak, mark it and repair it after the pressure is stabilized. Then retest until it is qualified (2) Qualified judgment: There is no leakage bubble in the sleeve, and the pressure does not drop during the stabilization period.
(3) The test record shall comply with the provisions of 3.1.2, 4 (3). 3.1.3.5 Long-distance and gathering pipeline test
(1Test steps:
a. Connect with the communication points set up along the line (a communication point should be set up every 2~3km along the line to notify the start time of the test, and it is strictly forbidden for irrelevant people, vehicles and livestock to enter the test warning area.
b Start the pressure test pump, and the test pressure should be increased slowly and evenly in sections, and the increase per hour shall not exceed 1MPa.
C. When the test pressure is higher than 3MPa, it should be increased in 3 steps: that is, stop increasing when the pressure reaches 30% and 60% of the test pressure, and stabilize the pressure for 30 minutes, then check the pipeline. If no problems are found, the test pressure can continue to be increased. When the test pressure is 23MPa, it should be increased in 2 steps, and stop increasing the pressure when the pressure is 50% of the test pressure. After stabilizing the pressure for 30min, observe the pipeline. If no problems are found, it can be Continue to increase the pressure to the test pressure
d. Abandon the test pressure and stabilize the pressure for 6 hours and check along the line. The pipeline should have no fracture, deformation, or leakage, and the pressure drop should not be greater than 2% of the test pressure. e. Reduce the test pressure to the working pressure, and make the gas temperature in the pipeline the same as the temperature of the surrounding medium (generally requires 24 hours), stabilize the pressure for 24 hours and then check again. f. During the test, if there is a leak or the pressure drop rate exceeds the specified value, try to find the source of the leak and eliminate it. Before welding repair, the pressure must be reduced to below 0.02MPa (no negative pressure should occur) before welding can be carried out, and then retest until qualified:
(2) Qualification judgment: During the pressure stabilization period, it is qualified if there is no leakage after inspection and the pressure drop rate is not greater than the allowable pressure drop rate. The pressure drop rate of the pipeline can be calculated according to formula (3.1.3-1). 4p= 100(1- P,
Pressure drop rate, %;
Absolute temperature of gas in the tube at the beginning of pressure stabilization, K; Absolute temperature of gas in the tube at the end of pressure stabilization, KAbsolute pressure of gas at the beginning of pressure stabilization, MPa; Absolute pressure of gas at the end of pressure stabilization: MPa: ps= pn+ Ps2
P,= z +p=
psl Pa1
Ps2P22
(3.1.3 1)
(3.1.3— 2)
(3.1.3 - 3)
Pressure gauge reading at the beginning and end of pressure stabilization, MPa: Local atmospheric pressure at the beginning and end of pressure stabilization, MPa. P, P, T, each value refers to the average value of each measuring point along the entire line. The allowable pressure drop rate of the pipeline is determined by formula 3.1.3-4. The pressure drop rate of the pipeline should not be greater than the allowable pressure drop rate.
APS CAJ
Allowable pressure drop rate, "%;
Nominal diameter of steel pipe, mm.
(3.1.3-4)
When the nominal diameter of the steel pipe is less than or equal to 300mm, the allowable pressure drop rate is 1.5%.
(3) The test record shall comply with the provisions of 3.1.2.4(3).5 Long-distance transmission and gathering pipeline test.
(1 Test steps:
a. Connect with the communication points set up along the line (a communication point should be set up every 2~3km along the line to notify the start time of the test, and strictly prohibit irrelevant people, vehicles and livestock from entering the test warning area.
b Start the pressure test pump, and the test pressure should be increased slowly and evenly in sections, and the increase per hour should not exceed 1MPa.
C. When the test pressure is higher than 3MPa, it should be increased in 3 steps: that is, stop increasing when the pressure reaches 30% and 60% of the test pressure, and stabilize the pressure for 30 minutes, then check the pipeline. If no problems are found, the test pressure can continue to increase. When the test pressure is 23MPa, it should be increased in 2 steps, and stop increasing the pressure when the pressure is 50% of the test pressure. After stabilizing the pressure for 30min, observe the pipeline. If no problems are found, it can be Continue to increase the pressure to the test pressure
d. Abandon the test pressure and stabilize the pressure for 6 hours and check along the line. The pipeline should have no fracture, deformation, or leakage, and the pressure drop should not be greater than 2% of the test pressure. e. Reduce the test pressure to the working pressure, and make the gas temperature in the pipeline the same as the temperature of the surrounding medium (generally requires 24 hours), stabilize the pressure for 24 hours and then check again. f. During the test, if there is a leak or the pressure drop rate exceeds the specified value, try to find the source of the leak and eliminate it. Before welding repair, the pressure must be reduced to below 0.02MPa (no negative pressure should occur) before welding can be carried out, and then retest until qualified:
(2) Qualification judgment: During the pressure stabilization period, it is qualified if there is no leakage after inspection and the pressure drop rate is not greater than the allowable pressure drop rate. The pressure drop rate of the pipeline can be calculated according to formula (3.1.3-1). 4p= 100(1- P,
Pressure drop rate, %;
Absolute temperature of gas in the tube at the beginning of pressure stabilization, K; Absolute temperature of gas in the tube at the end of pressure stabilization, KAbsolute pressure of gas at the beginning of pressure stabilization, MPa; Absolute pressure of gas at the end of pressure stabilization: MPa: ps= pn+ Ps2
P,= z +p=
psl Pa1
Ps2P22
(3.1.3 1)
(3.1.3— 2)
(3.1.3 - 3)
Pressure gauge reading at the beginning and end of pressure stabilization, MPa: Local atmospheric pressure at the beginning and end of pressure stabilization, MPa. P, P, T, each value refers to the average value of each measuring point along the entire line. The allowable pressure drop rate of the pipeline is determined by formula 3.1.3-4. The pressure drop rate of the pipeline should not be greater than the allowable pressure drop rate.
APS CAJ
Allowable pressure drop rate, "%;
Nominal diameter of steel pipe, mm.
(3.1.3-4)
When the nominal diameter of the steel pipe is less than or equal to 300mm, the allowable pressure drop rate is 1.5%.
(3) The test record shall comply with the provisions of 3.1.2.4(3).5 Long-distance transmission and gathering pipeline test.
(1 Test steps:
a. Connect with the communication points set up along the line (a communication point should be set up every 2~3km along the line to notify the start time of the test, and strictly prohibit irrelevant people, vehicles and livestock from entering the test warning area.
b Start the pressure test pump, and the test pressure should be increased slowly and evenly in sections, and the increase per hour should not exceed 1MPa.
C. When the test pressure is higher than 3MPa, it should be increased in 3 steps: that is, stop increasing when the pressure reaches 30% and 60% of the test pressure, and stabilize the pressure for 30 minutes, then check the pipeline. If no problems are found, the test pressure can continue to increase. When the test pressure is 23MPa, it should be increased in 2 steps, and stop increasing the pressure when the pressure is 50% of the test pressure. After stabilizing the pressure for 30min, observe the pipeline. If no problems are found, it can be Continue to increase the pressure to the test pressure
d. Abandon the test pressure and stabilize the pressure for 6 hours and check along the line. The pipeline should have no fracture, deformation, or leakage, and the pressure drop should not be greater than 2% of the test pressure. e. Reduce the test pressure to the working pressure, and make the gas temperature in the pipeline the same as the temperature of the surrounding medium (generally requires 24 hours), stabilize the pressure for 24 hours and then check again. f. During the test, if there is a leak or the pressure drop rate exceeds the specified value, try to find the source of the leak and eliminate it. Before welding repair, the pressure must be reduced to below 0.02MPa (no negative pressure should occur) before welding can be carried out, and then retest until qualified:
(2) Qualification judgment: During the pressure stabilization period, it is qualified if there is no leakage after inspection and the pressure drop rate is not greater than the allowable pressure drop rate. The pressure drop rate of the pipeline can be calculated according to formula (3.1.3-1). 4p= 100(1- P,
Pressure drop rate, %;
Absolute temperature of gas in the tube at the beginning of pressure stabilization, K; Absolute temperature of gas in the tube at the end of pressure stabilization, KAbsolute pressure of gas at the beginning of pressure stabilization, MPa; Absolute pressure of gas at the end of pressure stabilization: MPa: ps= pn+ Ps2
P,= z +p=
psl Pa1
Ps2P22
(3.1.3 1)
(3.1.3— 2)
(3.1.3 - 3)
Pressure gauge reading at the beginning and end of pressure stabilization, MPa: Local atmospheric pressure at the beginning and end of pressure stabilization, MPa. P, P, T, each value refers to the average value of each measuring point along the entire line. The allowable pressure drop rate of the pipeline is determined by formula 3.1.3-4. The pressure drop rate of the pipeline should not be greater than the allowable pressure drop rate.
APS CAJ
Allowable pressure drop rate, "%;
Nominal diameter of steel pipe, mm.
(3.1.3-4)
When the nominal diameter of the steel pipe is less than or equal to 300mm, the allowable pressure drop rate is 1.5%.
(3) The test record shall comply with the provisions of 3.1.2.4(3).
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.