Metal Expansion Joints
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PRE–ENGINEERED Expansion Joint ProductsPRE-ENGINEERED expansion joint products are pre-designed for immediate ordering. Because of their predetermined specifications, this catalog can be used as an on-site resourse by sales, engineering, MRO and purchasing professionals. PRE-ENGINEERED designs account for many basic expansion joint application requirements. Please refer to pages 4-14 for product designs and specifications. CUSTOM DESIGNED Expansion Joint Options
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CUSTOM DESIGNED Expansion Joint End ConnectionsBB – Banded BellowsIdeal for slipping over pipe and welding in place or into flange. WE – Welded EndBeveled to facilitate pipe-to-pipe welding. Most common end connection. FF – Fixed FlangeRecommended for ease of replacement. Requires accurate flange hole alignment VF – Vanstone FlangeEconomical solution for piping systems with misaligned bolt holes. LJ – Lap–Joint FlangeCommonly used when vanstone flanges are not an option.  CUSTOM DESIGNED Expansion Joint Internal Liners SW – Single Welded Liner Most common type of internal liner. For large axial movements. SD – Single Drop–In LinerCan be removed and cleaned. FW – Flush Welded LinerNo protrusion into flow-stream. For large axial movements. Can be removed and cleaned. PRE – ENGINEERED Expansion Joint TypesThough Hose Master Inc. manufactures many customized and intricate expansion joints for a variety of specialized applications, there are four basic designs that are most commonly used. Each is available in 15, 50, 150, and 300 psi and manufactured from T321 or T316 stainless steel. Inside diameters range from 2” – 30” (Pre-Engineered 300 psi expansion joints are available up to 24” i.d.). Basic BellowsA Bellows is an expansion joint without end fittings. Skirt (cuff at end of bellows) is sized to fit into flange or over pipe. Please specify at time of order. Unrestrained Single Expansion JointAn Unrestrained Single expansion joint is best used when piping systems are equipped with proper guides and anchors, to absorb axial, angular, and a small amount of lateral movement. 
Example of an Unrestrained Single expansion joint used in a proper piping system to absorb axial pipeline expansion.
Example of an Unrestrained Single expansion joint used in a proper piping system to absorb lateral deflection, as well as axial compression.
Limit Single Expansion Joint
A Limit Single expansion joint is best used when main anchors and guides are in the pipeline. It allows for some axial movement as well as lateral movement; however, the rod spacers protect the expansion joint from over-compression or overextension. Tied Single Expansion JointA Tied Single expansion joint is best used in piping systems without a main anchor. It allows for lateral movement only while retaining pressure thrust. 
Example of a Tied Single expansion joint where the expansion joint is installed 90° to the thermal growth of the piping. Because of the rods, the expansion joint is able to absorb lateral movement only. |
