When insulation pipe buried underground, surrounded required particle size less than 20 mm of sand filling, and then overwrite the original soil, filling sand thickness of not less than 200 mm. Roof insulation is generally not more than 1.2 meters depth metal external pressure compensator, but try not to be less than 0.7 m pressure bellows, pipe insulation can be directly buried in the various pipes below. Compensator installed before the system pressure test, to both ends of the pipe fixed to prevent the internal pressure thrust tension compensator. Ordinary axial bellows compensator consists of a bellows and two takeover constituted through a flexible deformable bellows to absorb axial displacement (also a small amount of horizontal, angular displacement) pressure balance compensators have to take over the connection and method Portland joins two forms. Small rod expansion joint on the main rigid support during transport or when the product is used as adjust the size of pre-deformation, not bearing parts. This class can not restrain the expansion joint thrust pipeline pressure, the pressure on both sides of the main thrust has to bear the fixed tube rack. Expansion joint structure is simple, low prices on the general lines are widely used. Var Compensator Selection | Serco supply material (certified) | compensation provided by Serco Gongyi City Water Supply Materials Co., Serco Gongyi City Water Supply Materials Co., Ltd. (www.gyxjbcq.com/) is Zhengzhou, gate leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Serco leadership material in the water with the staff warmly welcome all inquiries negotiations to create Serco supply material a better future.