Yancheng Hengtong petroleum Machinery Manufacture Co.,Ltd.Has become the membership of network of china Petroleum and Ocean Supplies material&Equipment Corporation.It has ben approved ISO 9001 certificate of quality and Licensed by the API Monogram Progarm for Spec 6A,Spec 6D,spec 16C,Spec 16A,spec 7.Also it has successively won the honor of the State .Jiangsu Province and Yancheng City Quality Management Advanced Enterprise. once its establishment ,ou fixed assets of over 20.88 million yuan ...