The pipe ram is use for single or double ram blow out preventer(bop).The ram's size is matched with the pipe's od. Its can be closed between the pipe stem and well annualer space. Main parameters: 1)standard: api 2)pressure: 2000~15000psi(14-70mpa) 3)size:nominal bore7 1/16~21 1/4" (179.4~539.75mm) 4) u type, s type available 5) shear/ pipe/blind ram 6) according to the latest api spec 16a standard, and quality standard of iso9001