Corrugated compensator selection principles

Corrugated compensator selection principles
Corrugated compensator application range: general factory piping and the need for flexible connections; all kinds of pumps, valves, air compressor import and export; all kinds of fire piping, air conditioning piping, steam piping, etc.; domestic water piping and the need for sanitation; machinery and equipment piping need to damping and compensation of thermal displacement occasions. As the corrugated compensator is widely used, so the requirements of the corrugated compensator are becoming more and more strict. How to improve the working stability of the corrugated compensator.
1 . Increase the corrugated wall thickness to provide the stiffness value of the bellows within the allowable pressure range.
2 . In the case of meeting the compensation volume requirements, reduce the value of wave crest and wave trough.
3 . Reasonable design of the number of corrugations, as far as possible to avoid "columnar instability".
Material selection principle: working temperature The working temperature range of metal bellows is -100~350℃. At high temperatures, the elasticity and fatigue life of most bellows materials will be significantly reduced. Cyclic stress Long life bellows need to be designed to work in the elastic range, but most bellows working conditions are in the elastic-plastic range, so materials with high yield strength and long fatigue life should be selected. The fluid contacted is compatible. Manufacturing process The bellows for expansion joints are mostly made of sheets or rolled into cylinders and welded into billets along the longitudinal seam, while welding
And is the bellows and expansion joint two broken joints with the common method, so the weldability of the material is the material selection considerations. Metal bellows made of austenitic stainless steel, pipe expansion joint wall thickness is generally 0.2 ~ 4mm. Therefore, if the wall thickness is too thick bellows stress instead of rising, more to promote the corrosion process, coupled with expansion joints constantly stretching flexure, the material surface of the oxide protective layer is easy to fall off, corrosion further accelerated. Austenitic stainless steel has excellent corrosion resistance, is a commonly used material.