Maalmahan, Hunan Great Steel Pipe Co., Ltd ayaa la siiyay tiro shahaadooyin aqbalaad ah oo ay bixiyaan hay'ado dhowr ah oo gudaha iyo kuwa caalamiga ah.Sida:
Nidaamka Maareynta Tayada (ISO 9001)
Shahaadada Tayada (CIQ)
Societe Generale de Surveillance SA (SGS)
