Requirements for non-metallic compensators/flexible fabric expansion joints

Requirements for non-metallic compensators/flexible fabric expansion joints
Non-metallic expansion joints are commonly used and installed in heating pipelines. During the heating season, non-metallic expansion joints will always be in operation and in running condition, and regular inspection and maintenance are required. The inspection time of non-metallic expansion joints should be once a month, so that non-metallic expansion joints are not only well inspected and maintained, but also do not affect their operation, and if there are any damage problems, they can be found in time, and can be repaired quickly.
Non-metallic expansion joints in the normal life cycle, no maintenance, non-metallic expansion joint replacement than metal compensator is much more convenient. This is obvious for large size compensators. Non-metallic expansion joints have many advantages and are commonly used in the flue duct system of large power station boilers, such as the inlet and outlet of air preheater, fan and induced draft fan system, inlet and outlet of electric dust collector, the original flue duct and net flue duct of desulfurization system, primary air system, secondary air system, inlet and outlet of coal mill, etc. can be installed with non-metallic expansion joints. The advantages of non-metallic expansion joints in a compact space to absorb the large expansion difference and torsional deflection angle, has been able to meet the use of various working conditions.
What are the requirements for the use of non-metallic expansion joints? The following, for you to speak in detail:
1 . Check whether the type of non-metallic expansion joint meets the design requirements before installation.
2 . For the compensator with inner sleeve, attention should be paid to make the direction of the inner sleeve and the direction of media flow, and the hinge rotating plane of the hinge compensator should be consistent with the displacement rotating plane.
3 . Hydraulic test, the end of the pipe should be increased with the compensator of the secondary fixed pipe frame, to prevent the pipeline movement or rotation. For the compensator and its connecting pipeline used in the gas medium, water injection should pay attention to the need for additional temporary support. The chloride ion content of the water cleaning solution for the hydraulic test should not exceed 25 PPM. all moving elements of the compensator should not be stuck or restricted in their range of motion by external elements, and the normal action of each moving part should be determined.
4 . As soon as possible after installation of the piping system, the yellow auxiliary positioning parts and fasteners used for installation and transportation on the corrugated metal compensator should be removed. It is strictly forbidden to use the deformation method of the corrugated metal compensator to adjust the installation tolerance of the pipeline, so as not to affect the normal function of the compensator, shorten the service life and increase the load of the pipeline system, equipment and supporting components.
5 . Need to "cold fix" compensator and auxiliary parts for pre-deformation should be installed in the pipeline. During the installation process, the welding slag must not splash to the wave shell, the surface, and must not cause other mechanical damage to the wave shell.