1. The strength test and the tight test have different pressures. The strength test pressure is 1.5 times the design pressure, the steel pipe is not less than 0.4MPA, the pressure of the plastic pipe is also different, the pressure is up to the design pressure in the test pressure is 1 hour, check the pipe interface with soapy water, all the interfaces are not qualified .
2. The rigorous test is carried out after the strength test is passed and the entire line is backfilled.
3. Strict test pressure, when the design gas pressure P is less than 5KPA, the test pressure is 20KPA, when P is greater than or equal to 5KPA, the test pressure is 1.15 times the design pressure, but not less than 0.1MPA, the duration is not less than 24 hours .