Installation pressure test of bellows expansion joint

1 . In addition to the design requirements pre-pressure or "cold tight" pre-deformation, the use of bellows deformation method to adjust the installation deviation of the pipeline is strictly prohibited, so as not to affect the normal function of the expansion joint, otherwise it will reduce its service life and increase the load of the pipe system, equipment and supporting components.
 
2 . Immediately after the installation of the pipe system should be removed on the expansion joint used for installation and transportation protection of auxiliary positioning agencies and fasteners, and according to the design requirements of the limit device to the specified position, so that the pipe system in the environmental conditions can be fully compensated.
 
3 . Need to be "cold tight" expansion joint, its pre-deformation of the auxiliary components used, should be removed after the pre-deformation of the expansion joint.
 
4 . For expansion joints with lined barrels, attention should be paid to make the direction of the lined barrel consistent with the direction of media flow (installed according to the flow direction sign of the expansion joint). The hinge rotation screen of the planar angular type expansion joint should be consistent with the displacement plane.
 
5 . The installation of the compensator test pressure stainless steel corrugated compensator before installation, should first check the corrugated compensator expansion joint type, specification and pipeline support configuration composite design requirements.
 
6 . Expansion joint all the movable elements shall not be external components jammed or restrict the normal action of its movable parts.
 
7 . The installation process does not allow the welding slag splash to the surface of the group bellows and make the bellows suffer other mechanical damage.
 
8 . Pipeline alignment should be good, in the absence of other methods to ensure, can be used after the laying of straight pipe cut equal length of pipe and then install the expansion joint method to ensure.
 
9 . After the hydraulic test, the water in the bellows should be drained as soon as possible and the inner surface of the bellows should be blown dry quickly.