 Bilie dị na China na e na-eje ozi na mmanụ na gas ụlọ ọrụ ebe ọ bụ na 2007, anyị na-enye ike aka ma na ngwaahịa gụnyere API 5L Line Pipe, carbon na alloy ọjà, casing na tubing, Steel efere, ọkpọ Rod, Steel Pipe Fittings, valves, na equipmen 