First, hydraulic test
1.The general use of clean water, when the austenitic stainless steel piping or austenitic stainless steel piping or equipment connected to the hydraulic test into the pipeline, the chlorine content in the water shall not exceed 0.005%, if the pipeline or the process has an adverse effect on the use of other suitable non-toxic liquids, when using flammable media for the test, the flash point shall not be less than 50 ℃;
2.The liquid temperature during the test shall not be lower than 5 ℃, and higher than the brittle transition temperature of the corresponding metal materials;
3. Subject to internal pressure of the pipeline in addition to the requirements of this item (5), the hydraulic test pressure in any part of the system are not less than 1.5 times the design pressure, when the design temperature of the pipeline is higher than the test temperature, the test pressure shall not be lower than the calculated value of the formula (1), when the PT in the test temperature to produce more than the yield strength of the pipeline material stress, should be reduced to the test pressure PT does not exceed the yield strength of the maximum pressure:
4. The pipeline subject to external pressure, the test pressure should be 1.5 times the design internal and external pressure difference, and shall not be less than 0.2MPa;
5.When the pipeline and container as a system unified hydraulic test, pipeline test pressure is less than or equal to the test pressure of the container, should be tested in accordance with the test pressure of the pipeline, when the pipeline test pressure is greater than the test pressure of the container, and can not be separated from the pipeline and the container, at the same time the container's test pressure is greater than or equal to 77% of the test pressure of the pipeline calculated in accordance with paragraph (3) of this article, after the If the design unit agrees, it can be tested according to the test pressure of the container;
6.The test pressure of the inner pipe of the jacket is determined according to the higher of the internal or external design pressure, and the test pressure of the outer pipe of the jacket is determined according to item (3) of this article;
7. The test slowly rising pressure, to reach the test pressure, stabilize the pressure for 10min, and then reduce the test pressure to the design pressure, holding pressure for 30min, to pressure does not fall, no leakage is qualified;
8.The test must be drained of gas in the pipeline, the test process found leakage shall not be handled under pressure, the end of the test liquid discharge need to prevent the formation of negative pressure.
Second, gas pressure test
(1) The gas used in the test is dry and clean air, nitrogen or other non-flammable and non-toxic gas;
(2) It is strictly prohibited to make the test temperature close to the brittle transition temperature of the metal;
(3) The test is equipped with an overpressure relief device, the set pressure shall not be higher than 1.1 times the test pressure or test pressure plus 0.34MPa (whichever is lower)
(4)Bear internal pressure steel pipe and non-ferrous metal pipeline test pressure for the design pressure of 1.15 times;
(5) Test gas must be used before the test pre-test, the test pressure of 0.2MPa;
(6) Test, should gradually and slowly increase the pressure, when the pressure rises to 50% of the test pressure, such as not found abnormal or leakage phenomenon, continue to test pressure by 10% step by step pressure until the test pressure, and then the pressure will be lowered to the design pressure for inspection to the foam test does not leakage as qualified, the test is strictly prohibited in the process of tightening bolts with pressure.
Third, the leakage test
Leakage test should meet the following requirements:
Transportation of extremely hazardous, highly hazardous fluids and combustible fluids pipeline should be leakage test
(1) Test in the pressure test after passing, the test medium should be used air, but also in accordance with the provisions of the design documents or relevant standards, the use of halogen, ammonia or other sensitive gases for lower test pressure sensitivity leakage test;
(2) Leakage test inspection focuses on the valve stuffing box, flange or threaded connections, venting valve, exhaust valve, drain valve and so on;
(3) Leakage test, the pressure rises slowly step by step, when the test pressure, and stop the pressure after 10min, with the method of brushing neutral blowing agent, tour check all the sealing points, in order not to leakage is qualified.
