Expansion joints

Expansion joints are devices containing a bellows membrane that are designed to absorb dimensional changes, such as those that occur due to thermal expansion or contraction of a pipeline, duct or vessel.

What Are Expansion Joints?

Piping Expansion Joint Construction

Pipe expansion joints are also known as compensators, as they 'compensate' for the thermal movement.

Piping Expansion Joint Construction
Expansion joint accessories
  1. Bellows
  2. Angle Flange
  3. Weld End
  4. Liner (Baffle)
  5. Cover
  6. Particulate
  7. Barrier/Insulation
  8. Liner Seal
  9. Purge

Expansion joint accessories

What industries use expansion joints?

Expansion joints are used in all kinds of different sectors and in a huge range of different industrial contexts. Essentially, wherever there is a need to control pipework movement expansion joints are required.

Application

补偿器选用技巧

补偿器采用矩形截面,圆角波形,管道中单个膨胀节承受二维方向位移。由2个膨胀节组成的肘接管道可承受三维方向位移。矩形圆角金属波纹膨胀节有全高、半高型、按照烟道尺寸,应力应变要求用户可多波节选用。

补偿器安装试压

波纹膨胀节与管道支座的安装方法详见下图,在安装过程中必须一致遵守。

补偿器疲劳测试

疲劳寿命设计由波纹管补偿器的失效类型及原因分析可以看出,波纹管的平面稳定性、周向稳定性及耐腐蚀性能均与其位移量即疲劳寿命相关。过低的疲劳寿命将会导致波纹管稳定性及耐蚀性能下降。根据试验和使用经验,用于供热工程的波纹管疲劳寿命应不小于1000次。

Thick Wall Pipe Expansion Joint

Thick Wall expansion joints are frequently used in heat exchangers, furnace and blast furnace pipe work.

These may be a cost-effective option for large-diameter piping systems which operate at low pressure. Metals can be selected to satisfy different temperature conditions. The distribution of axial, angular, and lateral forces will be different when thick-wall pipe expansion joints are used. We can provide your design engineers with the potential forces and movements for proper design of the structural members supporting the system. These joints have a long life which justifies the initial investment.

Thick-wall expansion joints are used primarily in heat exchangers and large diameter piping systems where thin-wall expansion joints would not be sufficient. The bellows are typically fabricated from A516 Grade 70 material, with the thickness ranging from 3/16" to 1". Other materials are available to meet different temperature requirements.

Thick Wall Expansion Joints are normally supplied without any end connections due to the fact that it is easier to weld the end fittings to them by a relatively less skilled welders. The heavy wall bellows are less susceptible to damage during installation and system start-up however these bellows possess high spring forces as a result of high convolution profile. The thickness of these thick wall bellows elements vary from 1 mm to 3 mm depending up on size and the height of convolution varies from 50 mm to 100 mm.

Thick Wall Expansion Joint (Bellows), has a very diverse methodology, which is explained in one of the articles below. The following calculations are supported:

  • Cylinder calculations
  • Differential axial thermal expansion
  • Axial rigidity
  • Radii requirements
  • Cylinder calculations
  • Cycle life
  • Minimum thickness based on material and service
CUSTOMISED EXPANSION JOINTS

Expansion joints are designed to safely absorb the movement in pipework systems due to heat-induced expansion and contraction of pipework.

Welding
Expansion joints with stainless steel bellows
Double flange with bolts& nuts
Connected with flange and bolt
Well packing
Well packing



SUNNY STEEL

Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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