Objective: When the sealing surface damage (depth <0.4mm of the scratch), seal failure, the injection of sealing resin, the restoration of its sealing performance.
Methods: to make the sealing surface damage, resulting in leakage 500cc/min, with high pressure injection gun, will be sealed into the resin, and switch several times, according to the pilot valve pilot seal a point of order, back to the zero-order leakage.
7, load test
Objective: To direct burial underground valve, and are subject to uniform loading of the foundation, assessment of its reliability.
Method: and elongation of the valve rod to exert a bending moment, for Class600, DN600 bending moment of the ball valve is 7.6 tons / m. Under pressure in 40Kgf/cm2 for gas seal test and switch test. Section of stem elongation on the stress determination. The result should be: no leakage of the valve; switch torque did not change; elongation under stress in the allowable range.
8, anti-seismic test
Objective: To valve's ability to resist an earthquake measuring in Figure (19) as shown.
Methods: velocity 12.2Kine, shock acceleration of 1373 gal circumstances, sealed test their performance and the determination to switch torque.
Figure (19) seismic test
9, long-term immersion tests
Objective: To assess the material properties of sulfur
Methods: in the transportation of crude oil and long-term immersion, the determination of the mechanical properties of materials change.
10, a fire test
6D in accordance with API standards provisions of Appendix A: Test-fire valve shall be a fire test standards ISO10497 authentication. In accordance with BS6755 Part II, API standard 6FA, API standards 6FC, API standards 6FD, or API Standard 607 to verify the structure of the fire can also be adopted, in Figure (20) as shown.
Figure (20) fire test
11, Life Test
Under pressure in the whole switch 1000, every 100 times, measuring the leakage, the result should be zero.
As for the valve shall be manufactured of conventional tests 6D and API standard API standard 598, the following items for the factory test:
Pressure strength test
Low-pressure sealing test
High-pressure sealing test
DBB function tests
Overpressure safety valve emissions test
According to API standards for the provisions of Appendix C, the purchaser may require factories to make the following additional test:
1) static test pressure of the hydraulic and duration than the provisions of API6D;
2) high pressure gas tests, using high-pressure gas to replace high-pressure liquid for sealing test
3) anti-static testing, measuring use of 12VDC, resistance can not be more than 10 ohms;
4) Torque test
5) discharge valve cavity pressure test;
6) hydrogen cracking test; materials by hydrogen split NACE TM0284 tests to verify requirements. valve ball valve gate valve check valve globe valve butterfly valve
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