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Pressure test of water source heat pump and yellow sand backfill
Issued by: Spring Island water source heat pump time: September 4, 2020

Pressure test

stay Water source heat pump After all joints are welded, the whole buried pipe system shall be subjected to hydraulic test. The test pressure is 0.9mpa, and the pressure is stabilized for 15min without leakage and pressure drop; the pressure is stabilized at the working pressure for at least 24h, and the pressure drop after pressure stabilization shall not be greater than 3%;

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Earthwork yellow sand backfilling

After the system pressure test is qualified, the backfill can be carried out. First, adjust the spacing and flatness of horizontal pipes. After the horizontal pipe is connected, the upper part shall be backfilled with original soil. Then inform the construction contractor to carry out the construction of the next concrete cushion and bearing layer. After the horizontal pipe is installed, the filling material shall be uniform, and shall not contain stones and soil blocks. The backfill shall be in close contact with the pipeline, but shall not damage the pipeline.

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