Metal bellows compensator has small occupied space, is not easy to leak, the compensation amount high life, safe and reliable, saving materials such as the best overall performance, and compared with the traditional opening type tension in comparison, has the advantages of small occupied area, low construction cost, convenient installation and repair and other characteristics, and the sleeve type compensator compares, has good sealing property, convenient installation and repair etc.. In addition, it has the following characteristics: ( 1) corrugated pipe adopts a multilayer ( 3? 12 ) structure, increase the compensation capacity, save the engineering quantity, reduce project cost, ( 2) the product of scientific and reasonable structure design, connection, installation, diversion, orientation, spacing and reliable measures. So it is widely used in petrochemical, gas, electric power, textile, food and marine industries. A pipeline system thermal displacement compensation or earthquake new member. But in the pipeline pressure test of corrugated compensator rod is broken when the accident occurred, such as in Shenhua Group on the curved heating system of the thermal power plant project, when the test pressure to 25 0.8MPa at expansion joints for metal bellows compensator is a row of 6 mounting member on the 10 channel steel hanger bulge bending, and cause the pipe axial displacement of 130ram. Therefore, the correct installation of multilayer metal bellows compensator is very important.