DN95 waterproof casing 02s404 flexible waterproof casing rigid waterproof casing

Rigid waterproof casing atlas Pipeline water closure test shall comply with the following provisions. When the design water head upstream of the test section does not exceed the inner wall of the pipe top, the test water head shall be calculated by adding the inner wall of the pipe top upstream of the test section
The design water head upstream of the test section exceeds the pipe top When the inner wall is used, the test water head should be added to the design water head upstream of the test section
When the calculated test water head is less than, but exceeds the upstream inspection well head, the test water head should be based on the height of the upstream inspection well head
Pipeline The closed water test shall be carried out in accordance with the appendix of this specification (closed water method test).
During the pipeline closed water test, a visual inspection should be carried out. There should be no leakage and the pipeline closed water test is qualified if the following regulations are met
The actual measured water seepage is less than or equal to the allowable water seepage specified in the table
When the inner diameter of the pipeline is greater than that specified in the table, the measured water seepage amount should be less than or equal to the allowable water seepage amount calculated according to the following formula. When the inner diameter of the pipeline is greater, sampling can be conducted based on the number of pipeline well sections/tests. If the test fails, the number of sampled well sections should be Double the test based on the original sampling.
When the inner diameter of the non-grooved construction is larger than or equal to the reinforced concrete pipeline, there are no design requirements and the groundwater level is higher than the top of the pipeline, the internal seepage method can be used to measure the amount of water seepage. The leakage water measurement method shall be carried out in accordance with the provisions of the appendix and shall comply with the rigid When the waterproof casing atlas stipulates, the anti-seepage performance of the pipeline meets the requirements, and there is no need to conduct a closed water test. The pipe wall must not have wire leakage. The parts with water droplets and seepage should be treated with anti-seepage treatment. The allowable amount of water seepage in the pipeline [/].