![]() ![]() Thin wall bellows have no circumferential welds. Heat exchanger shell bellows can also be thin wall multi-convolution bellows, ring reinforced for higher pressures. ![]() ASME Code inspection and U-2 stamp is required. ![]() Those bellows are formed by welding flanged and flued plates together, thus creating 1, 2, or 3 U-Shaped corrugations. The disadvantage is that a lot of fluid can be trapped in these corrugations and a drain is sometimes required. Because of material thickness, no cover is necessary. Heavy wall bellows are rugged, generally having a wall thickness equal or near to the shell wall. Design of such Bellows is covered by ASME Sec VIII Div 1, Appendix CC. Heat exchanger shell bellows can be heavy wall flanged and flued bellows. Design of heat exchangers is covered by the TEMA1 standards and ASME Sec VIII. Stainless steel or nickel alloy, which expands about 50% more than carbon steel. ![]() In most cases the tubes are hotter than the shell, moreover tube material is sometimes high alloy, i.e. Bellows deflection is only axial and can be either extension or compression depending on the differential expansion of shell and tubes. Heat Exchanger shell bellows are used on fixed tube sheet heat exchangers.
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