Metal flexible hose is an important part of modern industry. After the production of the metal hose is completed, a pressure test is required before use. The pressure test is also called the strength test, which belongs to the safety performance index test. To make it safe for use in future work, a metal hose pressure test is still necessary.
The purpose of the metal hose pressure test is to detect the presence of abnormal failure modes such as signs of leakage or damage. The test pressure is 1.5 times the nominal pressure. The pressurized medium used for the test is pure water, and its chloride ion content should not exceed 25 ppm. During the pressure test, each product must be carried out. A manual or electric pressure test pump is used for pressurization. A pressure gauge with a test pressure range of 1.5 to 4 times or a pressure test instrument of equivalent effect can usually be used for pressure detection. During the test, the hose test piece should be placed straight with one end installed. Plug with exhaust valve, the other end is connected to the outlet pipe of the pressure test pump, inject water into the pipe, discharge the air, close the exhaust valve, then slowly increase the pressure to the specified test pressure value, maintain the pressure for 5min, check Condition of appearance, whether there is leakage. Abnormal failure forms such as damage appear. Qualified product requirements do not allow abnormal failure modes such as signs of leakage or damage.
The above-mentioned pressurizing device can use a pressure generating device, a compressor unit or a gas cylinder, a gas cylinder group; pressure observation generally uses a pressure gauge above 1.5 or a pressure measuring instrument with the same measurement accuracy, and then supplements the water tank Finally, I would like to remind everyone that the test of the tightness of the metal hose can only be carried out after the pressure test is passed!
The pressure-resistant metal hose is installed in the liquid delivery system as a flexible pressure-resistant pipe fitting. It is used to compensate for the mutual displacement of the connection end of the pipe or machine and equipment, absorbs vibration energy, and can play the role of vibration reduction and sound attenuation. Good flexibility, lightweight, corrosion resistance, fatigue resistance, high and low-temperature resistance, and many other points. Therefore, it is necessary to carry out pressure tests on metal hoses.