Mazuva ano, Hunan Great Steel Pipe Co., Ltd yakapihwa zvitupa zvekugamuchira zvakapihwa nemasangano akati wandei epamba neekunze. Zvakaita se:


Quality Management System (ISO 9001)

Sitifiketi Yemhando (CIQ)

Nhoroondo ye Société Generale de Surveillance SA (SGS)
