The construction and installation standards of metal expansion joints
The construction and installation standards of metal expansion joints determine the normal operation of the pipeline, so what are the construction and installation standards of metal expansion joints?
When welding pipeline supports and brackets, no spot welding and false welding.
In order to metal expansion joint construction and installation of coaxiality, should first lay a good section of pipe, and then cut off a section of pipe with the same length as the pre-stretched expansion joint in the part ready to install the pipe expansion joint, and then install the metal expansion joint on the welding well.
Can not use the deformation of the metal expansion joint method to compensate for the installation of the pipeline deviation.
Note that the installation direction of the metal expansion joint should be the same as the direction of media flow.
After the installation of metal expansion joints, remove the transport tie rod and limit nuts before the test pressure, you need to check that the moving parts of the metal expansion joints can work properly.
Gas pipeline pressure test should be supported by additional temporary brackets to avoid sagging of metal expansion joints and pipelines, but remove the temporary brackets after the test pressure is completed.
When the pipeline with metal expansion joints is selected for sectional pressure test, the middle fixed bracket should be reinforced to be able to withstand the original design load and the thrust of the internal pressure blind.
