The vacuum insulation piping system of the International Standards is mainly used in international large-scale projects. 

Through a large number of international projects (including Linde, Air Liquide, Messer, Air Products, Praxair, BOC etc.), Chengdu Holy has established a set of Enterprise Standard and Enterprise Quality Management System based on the international standards and requirements. The Enterprise Quality Management System consists of a Quality Manual, dozens of Procedure Documents, dozens of Operation Instructions and dozens of Administrative Rules, and constantly update according to the actual work. 

The key points of production and inspection are controled by ASME, such as WPS (Welding Procedure Specification), WPQ (Welder Performance Qualifications) and NDT Personnel Certificate.