Housed Expansion Joints

Expansion Compensators and Housed Expansion Joints are essentially a bellows that is protected by and guided within a pipe housing.

While the industry offers two styles, one of which is referred to as “internally” and the other “externally pressurized”, they both serve the same function but we prefer the “externally pressurized” for improved bellows stability. They are furnished with a fixed ASA-150 Drilling Raised Face Carbon Steel Flange on the one end and a Floating Flange on the other. The alternates are Carbon Steel Threaded Nipples, Weld or Grooved Ends or Copper Female Sweat Ends as needed. These products are typically supplied in 304 stainless steel.

There are three movement choices: 2” (50mm) compression and 1/2” (13mm) extension, 4” (100mm) compression and 3/4” (19mm) extension or 8” (200mm) compression and 11/2” (38mm) extension. They are all designed for systems that will run hot and the slight extension is only there for those occasions when ambient temperatures are fairly high during installation, and the installation drops to some very low temperatures before they are put into hot water or steam service.

HEJFFL – Housed Expansion Joint with Fixed and Floating Flanges

Our Housed Expansion Joints can be supplied with carbon steel plate floating and fixed raised face flanges. The typical flange drilling is ASA-150, however alternative flange drillings are available on request. Pipe sizes from 2” (50mm) to 14” (350mm) are available in the product range.

HEJW – Housed Expansion Joint with Weld Ends

Our Housed Expansion Joints can also be supplied with bevelled weld end one side and fixed end at the other. Pipe sizes from 2” (50mm) to 14” (350mm) are available in the product range.

If you would like to order or learn more about these products, please contact Mason UK’s friendly team of engineers.

Related Products

Braided Annular Flexible Hose

Mason UK can provide a range of stainless steel braided annular flexible hose. These flexible pipe connectors are suitable for use with corrosive fluids, gases or temperatures and pressures outside of the rubber range.

Vee Assemblies

Many buildings are separated by expansion joints through the walls and floors. During an earthquake the two adjacent parts resonate with relatve motion of as much as +/- 100mm in shear as well as toward and away from one another.

Bellows Pump Connectors

All bellows differ from stainless steel hose in the corrugation configurations. Bellows are deeper and wider and they are made from a heavier material to handle the pressure without the braid. A very common location of our 2 ply bellows is at the pumps.

Expansion Compensators

Expansion Compensators are essentially a bellows that is protected by and guided within a pipe housing, and designed to give improved stability.

Expansion Joints

Many expansion joints are custom manufactured to diameters as large as 8 feet (2.4m). We can build to your specific product description or complete our own recommendations based on your movement and pressure requirements. 

Stainless Steel Flexible Pipe Connectors

Stainless steel connectors are used where movement is required between two pipes or pieces of equipment. They are mainly required when pipes have to bridge building expansion joints or to allow for movement of mechanical equipment.