oil pipe and flang Size: from 1/2 to 200 inch (DN15-DN6000) Standard: ANSI, DIN, ... , JB, GB, HG, UNI, API CS,SS... oil pipe and flang Technics: Forged Size: from 1/2 to 200 inch (DN15-DN6000) Types ... to seal pipe line, such as oil, petroleum, gas, chemical industry, nuclear power station, water and nuclear power construction, shipbuilding, food manufacturing ...