Axial Bellows Compensator

Axial Bellows Compensator
External pressure axial bellows compensator has a large amount of compensation. Compact structure. Good stability. Easy to maintain and use and other advantages. In recent years, due to the increase of environmental corrosion factors and the lack of understanding of various working media and environmental media, the traditional 300 series stainless steel bellows corrosion failure cases occur occasionally, and its safe use has attracted more and more attention. Combined with the bellows compensator corrosion failure measures, the analysis of the external pressure axial bellows compensator bellows corrosion causes. The failure of the external pressure axial bellows compensator is mainly bellows corrosion leakage. Through the corrosion failure of the bellows residual fragments of macroscopic observation. Metallographic analysis of cracks and fractures on the fragments. Electron microscopic analysis. Identification of crack shape and characteristics. Analysis of the composition of the corrosion products and fracture surface adhesion on the front of the crack tip end, it was found that the bellows generally has two forms: pitting corrosion perforation and stress corrosion cracking. By macroscopic observation of the residual fragments of the corroded failed bellows. Metallographic analysis of cracks and fractures on the fragments. Electron microscopic analysis. Identification of crack shapes and features. Analysis of the composition of the corrosion products and fracture surface adherents at the front of the crack tip end, it was found that there are two general forms of bellows: pitting corrosion perforation and stress corrosion cracking. Stress corrosion rupture of bellows caused by chloride ions accounts for more than ninety-five percent of all failure cases. The main factors affecting the stress corrosion are: media containing corrosive ion concentration. Stress size. Medium temperature. Material anti-stress corrosion sensitivity, etc. For the external pressure bellows compensator, stress corrosion mainly contains the media in contact with the bellows CL-concentration. Medium temperature. Media dissolved oxygen. The size of the medium pH and bellows stress related.