Stainless steel expansion joint

Stainless steel expansion joint refers to a flexible component that can effectively compensate for axial deformation. For example, the expansion joint welded on the fixed tube plate heat exchanger shell has high axial flexibility and is prone to deformation, which can compensate for the thermal expansion difference between the tube and the shell due to different wall temperatures, reduce their axial load, and thus reduce the temperature difference stress between the tube, tube plate, and shell, avoiding strength failure, instability failure, and tube pull-out failure. There are many types of expansion joints, including waveform, ring plate welding, and clamp shell structures. Among them, waveform expansion joints are widely used, while ring plate welding expansion joints are only suitable for atmospheric or low-pressure applications. Ripple compensators are also called expansion joints or expansion joints. Composed of corrugated pipes (elastic elements) and accessories such as end pipes, brackets, flanges, and conduits. It belongs to a type of compensation component. By utilizing the excellent expansion and contraction effects of its working body, the corrugated pipe can absorb dimensional changes caused by thermal expansion and contraction in pipelines, conduits, containers, etc., or compensate for axial, lateral, and angular displacements of pipelines, conduits, containers, etc. It can also be used for noise reduction and vibration reduction. Widely used in modern industry. In terms of heating, in order to prevent deformation or damage of the heating pipeline caused by thermal elongation or temperature stress during heating, compensators need to be installed on the pipeline to compensate for the thermal elongation of the pipeline, thereby reducing the stress on the pipe wall and the force acting on the valve or support structure

Classification of expansion joints

⑴ Axial type

⑵ Lateral type

⑶ Angular type

Expansion joint material

(1) Non metallic compensator

1. Rubber compensator

2. Fiber fabric compensator

(2) Metal compensator

1. Austenitic stainless steel: SUS304, SUS304L, SUS316, SUS316L, SUS310S, SUS321, SUS316Ti.

2. Duplex stainless steel: 2205 duplex steel (S31803)

3. Nickel based alloy steel: INCOLOY800/800H/800HT/840/825, INCONEL600/601/690/625/X-750. Hastelloy C-276/C-22/X, MONEL400/K500

4. Pure nickel: N4, N6 (Ni200, Ni201)

5. Stamping titanium plates: GR1, GR2, TA1, TA2

6. Large austenitic special stainless steel: 254SMO, 904L, AL6XN

Standard for Ripple Compensators

GB/T12777-2008

Function of Expansion Joints

① Compensate for axial, transverse, and angular cold and hot deformations of absorption pipelines.

② The expansion and contraction of the corrugated compensator facilitates the installation and disassembly of valve pipelines

③ Absorb equipment vibration and reduce the impact of equipment vibration on pipelines

④ Absorb the deformation of pipelines caused by earthquakes and subsidence