2022 First-class Construction Engineer Municipal Prediction Test Point Pressure Pipe Water Pressure Test, First-class Construction Final Prediction, Long Press and Like + Forward + Evaluation Continue to update, Wendang Edition Click on Me Avatar Private Message Me: 2022① Method:

2022 first-class construction engineer municipal forecast test point pressure pipeline water pressure test, first-built finish prediction, long press and like + forward + evaluation continue to be updated, Wendang version click on my avatar private message to me: 2022

① Method: Water injection method

② Pressure pipeline is divided into pre-test and main test stages; the basis for passing the test is divided into allowable pressure drop value and allowable water seepage value.

③Unless the design requirements, the length of the pipe section for the water pressure test should not be greater than 1.0km;

④ Test pipe section shall not be used as a plug plate, and shall not contain fire hydrant , water hammer eliminator , safety valve and other accessories;

test pipe section is filled with water, and it should be fully soaked under conditions not greater than the working pressure before conducting a water pressure test. The soaking time stipulates:

1) ductile iron pipe (with cement mortar lining), steel pipe (with cement mortar lining), and chemical building materials pipes shall not be less than 24h;

2) inner diameter is greater than 1000mm The cast-in-place reinforced concrete pipe channel, pre-stressed concrete pipe concrete pipe , and pre-stressed steel cylinder concrete pipe are not less than 72 hours; the cast-in-place reinforced concrete pipe channel, pre-stressed concrete pipe and pre-stressed steel cylinder concrete pipe with an inner diameter of less than 1000mm is not less than 48 hours.

The backfilling height on both sides of the pipeline and above the top of the pipe shall not be less than 0.5m (exposed interface) → Water pressure test → The rest of the grooves shall be backfilled after passing.