Metal Expansion Joints

Metal Expansion Joints Solve Demanding Temperature and Pressure Challenges

Metallic-Expansion-Joints_Holz_50x75 Holz Rubber Metal Expansion JointsHolz metal expansion joints solve the most demanding challenges facing the industry in air, gas and media problems within complex piping and ducting systems. Often, metallic or metal expansion joints are used when an extreme temperature range exists. Metallic expansion joint can be used when temperatures range is between -420°F to +1800°F. Additionally, metal joints can handle pressures up to 1,000 psi.

Although the metal strength is an advantage in certain application, a metallic expansion joint has the disadvantage of reduced spring rates coupled with thrust forces. In most applications where metallic expansion joints are used, additional supplies such as anchors, gaskets, or covers/liners are required.

It is important to evaluate the pros and cons of metallic vs. rubber expansion joints in your particular application. A Holz representative can help you determine which is best for your needs.

Metallic expansion joints are primarily used for:

  • Fossil fuel power generation
  • Pressure vessel manufacturing
  • Desalination plant
  • Petrochemical industry
  • Oil refineries
  • Chemical and pharmaceutical industry
  • Marine applications
  • Waste water treatment
Holz Rubber Metal Expansion Joints

Holz supplies the following metal expansion joints:

Holz Single Bellow Joint

Holz Rubber Metal Expansion Joints Single Bellow Joint
  • Most fundamental form of a metallic expansion joint
  • Designed in compliance with EJMA standards
  • Designed based on its unique environmental and installation conditions including pressure, temperature, movements, space and/or corrosion, etc.
  • Flanged or welded pipe ends
  • Compensates for movement that occurs within the pipe section in which it is installed

Holz Universal Expansion Joint

Holz Rubber Metal Expansion Joints Universal Expansion Joint
  • Designed to allow greater lateral movement than a single bellow metallic expansion joint
  • Manufactured for unique environmental and installation conditions; pressure, temperature, movements, space and/or corrosion, etc.

Holz External Pressurized Expansion Joint

Holz Rubber Metal Expansion Joints External Pressurized
  • Designed based on its unique environmental and installation conditions including pressure, temperature, movements, space and/or corrosion, etc.
  • Line pressure acts on the external surfaces of bellows by means of an external pressure chamber
  • Allows greater number of convolutions to be used for large axial movements without losing bellows stability

Pressure Balanced (elbow and inline) Expansion Joint

Holz Rubber Metal Expansion Joints Pressure Balanced
  • Designed to address pressure thrust while absorbing axial/lateral movements accomplished by the addition of equalizing bellows tied to the flow bellows in such a way as to cancel opposing forces induced by pressure
  • Rectangular or square expansion joints
  • Folded corner and mitered – low pressure bellows designed for ducting and fan applications

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