Quality inspection of ductile iron pipe:

1, mold management, mold should be well repaired and maintained, can not have obvious defects, so as not to affect the surface quality of pipe fittings.

2. The production capacity should have a warehouse large enough to store pipe fittings for conventional use, and attention should be paid to this issue in purchasing method inspection records. The ability to deliver on time is very important.

3, the use of materials should be stable and clean, some manufacturers too much use of recycled raw materials to reduce costs, will inevitably lead to quality problems.

4. The weight control system of pipe fittings shall ensure that the weight of pipe fittings is within the standard tolerance range.

5. Dimension inspection, the dimension of each pipe fitting should be checked with standard gage to meet the specified tolerance.

6. Hydrostatic test: every pipe fitting, regardless of its diameter, shall be hydrostatic test or equivalent effect test.

7, anticorrosive layer, the thickness of internal and external anticorrosive layer should meet the requirements of the standard.