AWWA C200 water steel pipe steel pipes are widely used in the following fields/industries:
Hydroelectric power station, potable
Water supply industry, irrigation pressure pipeline, sewage treatment pipeline
AWWA C200 standard covers butt welding, straight seam or spiral seam steel pipe, 6. (150 mm) and larger, for the delivery and distribution of water, including requirements for the manufacture of pipes, welding operations, allowable variations in weight and dimensions, preparation of the ends, manufacture of special parts, inspection and test procedures.
All work and materials stipulated in this standard can be inspected by the buyer, but such inspections shall not relieve the manufacturer of the responsibility for providing materials and performing work in accordance with this standard.
Manufacturers should maintain quality assurance programs to ensure that the minimum standards are met. It should include registered welding inspectors (AWS QC1) to verify qualified welders and welding procedures, procedures being implemented with limited testing and quality assurance functions.
Finished tubes should not be unacceptable defects. When the flaw depth is greater than 12.5% of the nominal wall thickness, the defects of the seamless steel pipe or weld base metal will be considered unacceptable.
If the depth of the flaw exceeds 1/3 of the nominal wall thickness of the pipe, the defect cannot be repaired if the length of the flaw having a depth greater than 12.5% is greater than 25% of the outer diameter of the pipe. Each repaired pipe should meet the standard requirements for hydrostatic testing.
Consecutive positions in each section of the pipe and in each special section shall be marked with serial numbers or other marks.