... JIS, EN, JB, GB, HG, UNI, API CS,SS... water pipe flang Technics: Forged Size: from 1/2 to 200 inch ... pipe line and keep its leakproofness; convenient for replacing pipe line; easy to separate and check the situation of pipe line; easy to seal pipe line, ... such as oil, petroleum, gas, chemical industry, nuclear power station, water and nuclear ...