Flexible waterproof casing test pressure should follow what specific requirements?

Pipeline test pressure 3 days before, to test pressure pipeline filling, filling water from the low end of the pipeline inflow, and open the exhaust valve, when filling to the discharge of water without bubbles and continuous water flow, close the exhaust valve, stop filling. Before the test pressure pipeline filled with water soaking time of not less than 48 hours.
Before the hydraulic test, the initial pressure test should be carried out several times before the gas in the pipe is exhausted, when and only when the gas in the pipe is exhausted, the hydraulic test can be carried out.
If the following three conditions indicate that the gas is not exhausted, should continue to exhaust: A, when boosting, the pump is constantly filled with water, but the pressure is very slow; B, when boosting, the pressure gauge pointer swing amplitude is very large and unstable readings; C, when boosting to 80%, stop boosting, open the water release valve, the water column has a "burst" sound and spray out Many bubbles.
Boosting pressure should be graded, each time to 0.2Mpa for a level, each level to check the back, pipe body and interface, when to determine no abnormalities, before continuing to boost pressure. Water pressure test, the back of the top support and pipe ends are strictly prohibited to stand.
Water pressure test in winter, should take effective anti-freezing measures, the test should be completed immediately after the discharge of water in the pipe and trench.
Flexible waterproof casing water pressure test, the body of the pipe, the interface is strictly prohibited to knock or repair defects, in case of defects, should be marked, after the pressure can be repaired.