Expansion joint commonly is composed by body, telescopic tube, and gland and sealing ring. The installation problems of expansion joint largely affect the service life and pipeline safe operation. Especially aerial installation of expansion joint is to ensure that absolutely no quality problems, otherwise once the consequences of an accident are quite serious.
Firstly, expansion joint in aerial installation should be set up when both ends bearing and guide bracket, the weight of the bearing support is to prevent the entire pipeline focus on the expansion joint, so easy to cause the expansion joint Angle to distort or even rupture. For the stress of the bearing bracket it must be greater than the axial force of pipeline scaling, or stent can't play the role of supporting pipe. Diversion of stents installed in order to make the rough tend to axial vibration range, because the general expansion joint are the main compensation axial displacement, if angular or lateral displacement is too large, the pipe will cause expansion joint damage.
Secondly, the corner of overhead line also needs to add the adhesion, because the media under the effect of inertia, encounter bend pipe lining will produce a great impact, at the same time cause huge vibration. So installing expansion joint here needs support at both ends to ensure the safe operation of pipeline.
