Inspection method: Check the re-inspection report.

1. The materials, specifications, models, quality, etc. of pipes and fittings should comply with the current relevant national product standards and design requirements.

2. In addition to complying with the product standards, the appearance quality of pipes and fittings should also meet the following requirements:

No surface cracks, shrinkage cavities, slag inclusions, folds, Defects such as heavy tarnishing and corrosion or dents that do not exceed the negative deviation of the wall thickness; the thread surface is intact without damage, the flange sealing surface is flat, smooth, without burrs and radial grooves; the gasket has no aging, deterioration or delamination, and the surface has no Defects such as wrinkles. Number of inspections: All inspections. Check the factory inspection report and certificate. Inspection method: observation and inspection.

3. The specifications, dimensions, wall thickness and allowable deviations of pipes and fittings should comply with their product standards and design requirements.

Quantity to be inspected: 20 products of each specification and model will be randomly inspected according to the number of pieces, and shall not be less than 1 piece. Inspection method: Use steel ruler and vernier caliper to measure.

4. Pipes and pipe fittings that fall into one of the following situations should be sampled by the supervision engineer and tested and re-inspected by a testing unit with corresponding qualifications. The re-inspection results should comply with the current relevant national product standards. and design requirements. There are re-inspection requirements in the design. There are doubts about the quality. Inspection quantity: According to the design requirements or the quantity required for inspection.

Extended information

Pipes are necessary materials for construction projects. Commonly used materials include water supply pipes, drainage pipes, gas pipes, heating pipes, electrical conduits, rainwater pipes, etc. With the development of science and technology, pipes used in home decoration have also gone through the development process of ordinary cast iron pipes → cement pipes → (reinforced concrete pipes, asbestos cement pipes) → ductile iron pipes, galvanized steel pipes → plastic pipes and aluminum-plastic composite pipes .

1. Water supply pipes: galvanized steel pipes, stainless steel pipes, plastic-coated steel pipes, copper pipes, aluminum-plastic composite pipes, ABS plastic pipes, polyethylene pipes, polypropylene pipes, etc.

2. Drainage pipes: steel pipes, cast iron pipes, socket-type prestressed reinforced concrete pipes and socket-type self-stressing reinforced concrete pipes, GPR polyester resin pipes, HOBAS centrifugal cast glass fiber reinforced polyester Resin pipes, polyethylene pipes, PVC plastic pipes, etc.

3. Heating and gas pipes: galvanized steel pipes, CPVC plastic pipes, ABS plastic pipes, polyethylene pipes, etc.

4. Wire casing: magnetic tube, aluminum-plastic composite tube, etc.

5. Rainwater pipes: iron pipes, cast iron pipes, aluminum-plastic composite pipes, PE plastic pipes, etc.

Baidu Encyclopedia - Pipes

Baidu Encyclopedia - Pipe Testing