Install license GC grade pipeline issued by quality and Technical Supervision Bureau of Hubei province express warm congratulations on the company! It has laid a solid foundation for the company to develop the industry pipeline engineering such as natural gas, oil, chemical and combustible gas.. Pressure piping classification and grading: according to the TSG D0001-2009 "pressure piping installation licensing rules", the business scope of the company is mainly GC class industrial pipe, has obtained the permit installation of categories for GC level.