PU Ductile Iron Pipe is ductile iron pipe with a polyurethane coating, polyurethane coating is made of bi-component polyurethane materials to a scale, and not only does it serve as the inner-lining material of nodular castiron pipe.
PU Ductile Iron Pipe is ductile iron pipe with a polyurethane coating, polyurethane coating is made of bi-component polyurethane materials to a scale, and not only does it serve as the inner-lining material of nodular castiron pipe, but as related outer errosion resistant coating. Polyurethane coating has many advantages such as wonderful abrasive resistance, excellent corrosion resistance, non-permeation, smmoth surface, small resistance coeffecient, few volatile organic compound,remarkable environmental protection property, ect. Some polyurethane coatings with a thickness of 900μm,are mainly applied to transportingcorrosive mediums or the mediums with high sanitary condition, including soft water, desalination seawater, municipal wastewater, industrial wastewater, and others; and some with thickness above 700μm are mainly applied to the soil environment with strong corrosivity such as the soil polluted by industrial wastewater or with low specific resistance.
1.General:
The pipe shall be heated to a temperature within the tolerances recommended by the coating material provider or manufacturer.
The coating shall be applied to the full length of each pipe:
coating of the spigot and the socket, with epoxy or polyurethane;
coating of the pipe barrel with polyurethane.
During the coating and curing periods, the coated pipe shall be handled with due care in order to avoid any damage to the coating.
After coating cure, the pipe shall be cooled to facilitate the inspection.
Repairs within the plant are acceptable. They are made under the manufacturer’s responsibility. The manufacturer shall select the method and process to be used and establish a written repair procedure.
All coating materials purchased or used under this specification shall be packaged in suitable and approved containers. These containers shall be plainly marked with the name of the manufacturer, type of material and batch or lot number where applicable. Bulk shipment may be allowed provided the above information is included in the bill of loading.
The coating materials shall be packaged in containers suitable to keep the contents clean and dry during handling, shipping and storage. Storage and handling conditions shall be in accordance with the manufacturer’s written recommendations.
Precautions shall be taken during handling, shipping and storage of all materials to prevent damage to the containers that would result in contamination of the coating materials. All contaminated or otherwise damaged materials shall be discarded.
2. Polyurethane:
The polyurethane used shall be a solvent free two-component system.
Polyurethane, mineral fillers, pigments and additives shall be selected in order that the final product complies with the performance requirements given in clause 6 of this standard.
3. Epoxy resin:
Depending on the method of application, the epoxy resin used shall be:
solvent free two-component liquid, for spray application;
powder, for electrostatic spraying.
Mineral fillers, pigments and additives shall be selected in order that the final product complies with the performance requirements given in clause 6 of this standard.
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