Standard specification for closed water test of sewage pipes
The closed water test of sewage pipeline refers to the closed water test to check the sealing performance and stability of sewage pipeline system after installation. The following are some relevant standards and specifications:
1. Code for Design of Urban Water Supply and Drainage (GB500 15-2003): specifies the design and construction requirements of urban water supply and drainage projects, including the test standard of sewage pipe closing.
2. Code for Construction and Acceptance of Building Water Supply, Drainage and Heating Engineering (GB50242-2002): It specifies the construction and acceptance standards of building water supply, drainage and heating engineering, including the closed water test standard of sewage pipes.
3. Code for Quality Acceptance of Building Water Supply and Drainage Engineering (GB50268-20 18): It specifies the quality acceptance standards of building water supply and drainage engineering, including the closed water test standards of sewage pipes.
4. Code for Acceptance of Construction Quality of Municipal Public Works (GB503 15-20 18): specifies the acceptance standards of construction quality of municipal public works, including the closed water test standards of sewage pipes.
The specific standards and methods of the closed water test will vary according to different regions and projects, so before the closed water test, you should consult the relevant standards and specifications and operate according to the actual situation.
What method is used to do sewage closed water test to prevent water leakage?
The closed water test of sewage pipeline is an important work to test the sealing performance of pipeline system after pipeline installation. The following are some methods that can be used in the closed water test:
Inspection of pipeline system: Before the closed water test, check whether the pipeline system is defective or damaged, including whether the pipeline joint is intact and whether the pipeline wall is cracked.
Selection of appropriate test pressure: The appropriate test pressure should be selected according to the specifications and design requirements of the pipeline during the closed water test. The test pressure is usually 1.5 to 2 times of the working pressure of the pipeline.
Use appropriate sealing materials: When conducting water tightness test, it is necessary to use appropriate sealing materials to ensure the tightness of the pipeline. Commonly used sealing materials are rubber gasket, sealant and sealing tape.
Step-by-step pressure test: In order to better check the sealing performance of the pipeline system, the pressure test can be carried out step by step, that is, first try a section of pipeline to check whether there is water leakage, and then try the next section until the whole pipeline system is tried.
Continuous pressure test: During the closed water test, the pressure test shall last for a certain time, usually 1 hour to 2 hours. During the pressure test, it is necessary to constantly check whether the pressure of the pipeline system is stable and whether there is water leakage.
Generally speaking, when the sewage pipeline is closed, appropriate test pressure and sealing material should be selected, and the operation should be carried out in strict accordance with test standards and specifications to ensure the sealing performance of the pipeline system.
What is the allowable leakage of sewage closed water test?
According to Code for Construction and Acceptance of Urban Sewage Pipeline Engineering (GB50242-20 15), the allowable leakage standards for closed water test of sewage pipeline are as follows:
Pipeline hydrostatic test: the allowable leakage should not be greater than 0.1l/(m _ h);
Air tightness test of pipeline: the allowable leakage should not be greater than 0.3l/(m _ h)；);
Hydrostatic test of inspection well: the allowable leakage should not be greater than 0.3l/(m _ h)；);
Air tightness test of inspection well: the allowable leakage should not be greater than 0.6L/(m_h).
It should be noted that the specific allowable leakage should also be determined according to the actual situation and engineering requirements.