In City of Yokohama, Water Works Bureau, the internal painting of ductile cast iron pipe (direct pipe) used mortar lining, but, from April 1, 2018, adopts the epoxy resin powders painting.
Direct pipe of ductile cast iron pipe from diameter 50mm to 400mm assumes principle, internal epoxy resin powders painting pipe.
As for the drill to use in perforation work, 100 degrees from 90 degrees, torsion angle, please use thing from 5 degrees to 30 degrees the tip corner.
Polyethylene sleeve, please use "powders painting pipe" of JAPAN WATER WORKS ASSOCIATION standard "JWWA K 158" and displayed thing.
Indication example of polyethylene sleeve
Inquiry about water supply to Water Works Bureau customer Service Center