The joint of each pipe of ductile iron pipe must be sealed by sealing experiment to determine the pressure standard to ensure that the plastic or ductile iron pipe joint is mixed with a certain amount when it is in operation, and it should be sealed well.

 

Then the maximum gap of socket ductile iron pipe after docking should be between 5% and 0%, so that the inner surface of socket can be machined, so as to achieve the wall thickness required by customers. In sealing test of socket joint, the socket part should be cut more than 2 times the inner diameter of spherical iron pipe, and the wall thickness should be between 0% and 10% to meet the requirements of customers. It meets ISO10804-1. Regulations.