-
API 7-1 Drilling String Valves
Drill string kleppen stopje floeistof út streamt de boar string faak as de drill skopt mei it bit off bottom.LANDRILL kin leverje premium kwaliteit Folsleine iepening feilichheid fentyl (FOSV), Kelly fentyl, Inside blowout preventer (IBOP), Drop-in check fentyl , Float klep.
Keamer 703 Building B, Grienlân sintrum, Hi-tech ûntwikkeling sône Xi'an, Sina
86-13609153141
