Pressure Cycle Test For Fire Hoses

The length of the pipe section test piece is (500±50) mm. Use appropriate measures to block the inlet and outlet of the pipe, and connect it with the water pressure supply system, fill with water to remove air, and then carry out 3000 times from (0.4±0.1) MPa to MPa. For alternating water pressure test, the period of each test is not more than 2 s. After the test, check the inner coating and carry out the adhesion test according to the provisions of 6.4. The test results should meet the provisions of 5.13.