1, hydrostatic test pressure is the working pressure of the pipeline, and the test pressure should not be less than 0.80MPa. When the working pressure of the pipeline is less than 0.8MPa, the hydrostatic test pressure is 0.8MPa, and the pneumatic test shall not replace the hydrostatic test.

2. After the pipeline is filled with water, the exposed connection points (including the connection parts between the pipeline and the pipeline accessories) that have not been backfilled shall be inspected, and the leakage shall be eliminated if found; ?

3. The length of pipeline hydrostatic test should not be greater than 1000m m, and the length of pipeline section with accessories in the middle should not be greater than 500m m. Pipes made of different materials in the system should be tested separately.

4. Check the firmness and reliability of the end of the pressure test section. During the pressure test, it is forbidden to loosen or collapse the supporting facilities, and the valve shall not be used as a sealing plate.

5. Mechanical equipment with metering device shall be used for pressurization, the accuracy shall not be lower than 1.5 (maximum permissible error shall not exceed 0.5% of the maximum scale of 65438+), the measuring range shall be 1.3~ 1.5 times the test pressure, and the dial diameter shall not be less than 150mm.

Information-rich selection of water pipes for home decoration

Zhejiang Tianqing Pipeline Industry Co., Ltd. Huang Minghui

First, the classification of water pipes

According to the materials used, there are:

1, metal pipes, such as galvanized steel pipes, copper pipes and stainless steel pipes. ;

2. Non-metallic pipes, such as UPVC (hard polyvinyl chloride), PB (polybutene), PP-R (random polypropylene), PP-B (block polypropylene), HDPE (high density polyethylene), PEX (crosslinked polyethylene), PE-RT (heat-resistant polyethylene), ABS (acrylonitrile butadiene styrene) and CPVC (chlorinated polyvinyl chloride).

3. Composite pipes, such as aluminum-plastic composite pipes, steady-state PP-R pipes, steel-plastic composite pipes, plastic-coated steel pipes and steel skeleton PE pipes.

According to the application field:

1, civil water pipes, mainly used in the field of drinking water for residents, mostly work intermittently;

2. Industrial water pipes are mainly used for all kinds of water supply pipes that need continuous work in the industrial field.

According to the use temperature:

1, cold water pipe, mainly used for water supply pipes with working temperature not higher than 40℃;

2. Hot water pipes are mainly used for water supply pipes with working temperature higher than 40℃, but they can also be used for cold water.

Reference: Baidu Encyclopedia: Water Pipe