Latest quality control standards for ductile iron pipes

Cement mortar is lined with epoxy coating. Apply zinc spray and apply asphalt anticorrosion paint. The thickness of metal zinc spraying shall not be no less than 130g / ㎡, and the zinc content of metal zinc shall be at least 99.95%.
1.1 Technical requirements
1.2 Implementation standards
1.GB / T13295-2013 Ductile Iron Pipe, Pipe and Accessories for Water and Gas Pipeline;
2. Pipe fittings lined with cement mortar, spray galvanized asphalt, ISO4179 and ISO8179 standards respectively.
3. The epoxy sealing layer of the inner village meets the ISO 16132-2004 standard
4. Self-anchor pipe complies with GB / T13295-2013, Ductile Iron Pipe, pipe fittings and Accessories for Water and Gas Pipeline
5. Testing methods, inspection rules, size, shape, weight and allowable deviation, marking, packaging, quality certificate, transportation, storage and technical requirements shall be carried out according to GB / T13295-2013 standard.
1.3 Mechanical properties
The tubes is manufactured by centrifugal casting process and must be annealed with mechanical properties as follows:
Tensile Strength (MPa)
Yield Strength (MPa)
hardness (HBW)
≥420
≥300
≤230
1.4 Dimensions, shape, and weight
1. The interface adopts sliding-in T-type interface and self-anchor interface, and the size meets the requirements of GB / T13295-2013 standard.
2. Effective length L=6000mm, and pressure grade are K9.
3. The end surface of the cast iron pipe should be perpendicular to the axis.
4. Pipe specifications and allowable deviation shall comply with the provisions of GB / T13295-2013.
5. Weight acceptance: According to the national standard calculation, the allowable error of the standard quality tolerance is ± 3%.
1.5 Quality requirements
1. The ductile iron pipe shall be made of the ductile iron of the ferrite matrix. There should be a certain amount of spherical graphite in the tissue.
2. Hydrostatic test, tensile strength and elongation shall comply with the provisions of GB / T13295-2013 standard.
3. The surface hardness shall not be greater than 230 HBW.
4. The internal and external surfaces shall not have defects that hinder the use.
5. The cast iron pipe is lined with cement mortar, part of the cement mortar lined with epoxy sealing layer, the outside of zinc spray asphalt coating, before coating, the inner and outer surfaces should be smooth, without rust, iron sheet. After coating, the internal and external surface should be smooth, the coating is uniform, adhere adhesion, and not abnormal due to cold and cold climate. The roughness of cement mortar lining pipe is less than 0.013, and the roughness of cement mortar lining with epoxy sealing layer is less than 0.008. The thickness of metal zinc spraying shall not be no less than 130g / ㎡, and the zinc content of metal zinc shall be at least 99.95%.
6. Spray the outer surface of the socket with GB / T13295-2013.
7. For each outlet of ductile iron pipe and pipe fittings, and the spare amount shall be provided at 1% of the total number of rubber rings, and the quotation shall be included in the total bid price.
8. The pipe is manufactured with lining cement mortar and epoxy coating, the outer wall is coated with asphalt, the lining cement meets ISO4179 standard, the outer asphalt meets ISO8179 standard, and the lining epoxy coating meets ISO 16132