According to different casting methods, divided into continuous cast iron pipe and the centrifugal cast iron pipe, wherein the centrifugal cast iron pipe is divided into two types of sand and metal.

The forming mechanism of pinhole defect in no-solvent polyurethane coat on centrifugal nodular cast iron pipe is analyzed, some effective measures to eliminate offered.

When using centrifugal cast iron pipe, we should pay attention to its installation and technical requirements, such as that of stainless steel clasp and local support and hanger of pipe.