The valve shall be subjected to the shell pressure test and the seal test. The valve with the upper seal structure shall also be subjected to the upper seal test and shall comply with the following requirements:
1 Valve test should use clean water as the medium. When testing stainless steel valves, the chloride ion content in the water shall not exceed 25 × 10-6 (25ppm). Water stains should be removed immediately after passing the test. When there are special requirements, the test medium should meet the requirements of the design documents.
2 The test pressure of the casing of the valve shall be 1.5 times the maximum allowable working pressure of the valve at 20 ° C; the sealing test pressure shall be 1.1 times the maximum allowable working pressure of the valve at 20 ° C; when the valve nameplate indicates the maximum working pressure difference or When the valve is equipped with an operating mechanism that is not suitable for high-pressure sealing test, the test pressure shall be 1.1 times the maximum working pressure difference indicated on the valve nameplate; the upper sealing test pressure of the valve shall be 1.1 times the maximum allowable working pressure of the valve at 20 °C. The test pressure of the jacket portion of the jacketed valve shall be 1.5 times the design pressure.
3 The duration under test pressure shall not be less than 5 min.
4 The pressure test of the valve housing should be qualified with no leakage of the casing packing. The valve sealing test and the upper sealing test shall be qualified only if the sealing surface is not leaking.
5 Inspection quantity: The following provisions shall be met:
1) Valves for Class C1 pipes and Class C fluid pipes with a design pressure greater than or equal to 10 MPa shall be 100% inspected.
2) For valves of Class GC2 and all Class C fluid pipes with a design pressure less than 10 MPa, 10% of each inspection lot shall be inspected and not less than one.
3) Valves for GC3 pipelines and Class D fluid pipelines shall be checked 5% and not less than one for each inspection lot.
6 Inspection methods: observation inspection, inspection of valve test records, inspection of water quality analysis report.
4.0.4 The safety valve shall be adjusted for pressure setting and sealing before installation. Other performance tests shall be carried out when there are special requirements. The test results shall comply with the provisions of the current national standard "Safety Valve Safety Technical Supervision Regulations" TSGZF001 and design documents.
Inspection quantity: all inspections.
Inspection method: Check the safety valve calibration report.
4.0.5 For GC1 and C fluid pipelines, pipes and fittings with a degree of toxicity that is extremely hazardous or with a design pressure greater than or equal to 10 MPa shall be subjected to magnetic particle testing or penetration testing on the outer surface. The test results shall not be lower than the current national standards. "Non-destructive testing of pressure equipment, part 4, magnetic particle testing" JB/T4730.4 and "Non-destructive testing of pressure equipment, part 5, penetration testing", Class I, specified in JB/T4730.5. The actual wall thickness after the surface defects detected by the inspection shall not be less than 90% of the nominal wall thickness of the pipe and shall not be less than the design wall thickness.
Quantity of inspection: 5% of each inspection lot, and not less than one.
Inspection method: Check the magnetic powder or penetration test report and check the thickness measurement report.