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The flexible waterproof casing material is bitumen, hemp, polystyrene board, and polyvinyl chloride foam board. So, what are the pressure requirements for flexible waterproof sleeves in pipe belts?
If the casing passes through the wall when it encounters a non-concrete wall, it should be replaced with a concrete wall. The pouring range should be 200 times larger than the diameter of the wing ring, and the casing must be fixed in the wall at one time. The thickness of the concrete wall at the pipe should be less than 300, otherwise the wall should be thickened on one or both sides, and the diameter of the thickened part should be at least D5 + 200.
The weight of the casing is calculated by L = 300. If the wall thickness is greater than 300, it shall be calculated separately. The design requirements of the flexible waterproof casing for the pressure of the pipeline, and the flow of various media in the pipeline will generate pressure, so the pressure of the flexible waterproof casing in the pipeline must be stricter.
Pressure pipelines: pressure pipelines with safety valves: pipeline design pressure ≥ safety valve opening pressure; pressure pipelines connected to equipment without safety valves: pipeline design pressure ≥ equipment design pressure.
Centrifugal pump outlet pipeline: pipeline design pressure ≥ pump closing pressure; reciprocating pump outlet pipeline: pipeline design pressure ≥ pump outlet safety valve opening pressure; compressor discharge pipeline: pipeline design pressure ≥ safety valve opening pressure + compressor outlet to safety valve Pressure drop at maximum normal flow along the way. The design pressure of the flexible waterproof casing is greater than or equal to the maximum value of the working pressure fluctuation.