Code for Construction and Acceptance of Water Supply and Drainage Pipeline Works (GB50268-97) 9.2.10 Hydraulic test shall comply with the following provisions: 1 Test pressure shall be selected and determined according to Table 9.2.10-1 Test pressure (MPa) of pressure pipeline hydraulic test in Table 9.2.10-1 Pipe type Working pressure P Test pressure Pipe P P+0.5, And not less than 0.9 ductile iron pipe ≤ 0.52P > 0.5p 0.5 pre-stressed concrete pipe, prestressed steel tube ≤ 0.61.5P > 0.6P 0.3 Cast in situ reinforced concrete pipe channel ≥ 0.11.5P Chemical building materials pipe ≥ 0.11.5P, In the pre-test stage, the water pressure in the pipeline shall slowly rise to the test pressure and maintain the pressure for 30min. If the pressure drops during the period, water can be injected to replenish the pressure, but it shall not be higher than the test pressure; Check the pipe joints, fittings and other places for leakage and damage; When there is water leakage and damage, the pressure test should be stopped in time, and the cause should be identified and the corresponding measures should be taken to test the pressure again; 3 Main test stage: stop water injection and recharge pressure, stabilize for 15min; When the pressure drop does not exceed the allowable pressure drop value listed in Table 9.2.10-2 after 15min, reduce the test pressure to the working pressure and maintain the constant pressure for 30min. Perform the appearance check. If no water leakage occurs, the water pressure test is qualified. Table 9.2.10-2 Allowable pressure drop (MPa) for hydraulic test of pressure pipes Pipe Type Allowable pressure drop for test pressure Pipe P+0.5, And not less than 0.90 nodular cast iron pipe 2P 0.03P 0.5 pre-stressed reinforced concrete pipe, prestressed steel tube concrete pipe 1.5P P 0.3 in-situ reinforced concrete pipe 1.5P chemical building materials pipe 1.5P, and not less than 0.8 0.02 4 pipe pressure, gas should be removed from the pipe, During the pressure increase process, when the spring manometer is found to swing, unstable, and the pressure increase is slow, it should be re-vented and then increased; 5 The pressure should be increased by stages. The back, support pier, pipe body and interface should be checked every step. When there is no abnormal phenomenon, the pressure should be increased again. 6 During the water pressure test, the back top brace and both ends of the pipeline are strictly prohibited from standing; 7. It is strictly prohibited to repair defects during hydraulic test; In case of defects, it should be marked and repaired after pressure relief.
Fill in the test results truthfully, including: How much water pressure is used, and how long is the constant pressure? What about the test results? For example, does the test object leak phenomenon?