Maalmahan, Hunan Great Steel Pipe Co., Ltd ayaa la siiyay tiro ka mid ah shahaadooyinka aqbalaadda 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)
