Expansion Joint Manufacturers Association

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The Expansion Joint Manufacturers Association is an organization of metal bellows expansion joint manufacturers. It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing. [1] The EJMA standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. The standards are a combination of a variety of expansion joint manufacturers' knowledge and experience. [2] [3]

Contents

The EJMA organization performs extensive technical research on a variety of topics concerning the design and manufacturing of expansion joints. [4] This knowledge contributes to providing new versions of the EJMA book of standards.

Members

The current members that are a part of the Expansion Joint Manufacturers Association include:

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US Bellows is a manufacturer of metal bellows, fabric expansion joints, and metallic expansion joints including refractory lined, hinged, gimbal, slip-type, in-line pressure balanced, and elbow pressure balanced expansion joints. It was acquired by Piping Technology and Products in 1997 from Ketema-U.S. Bellows, Inc. and is now located in Houston, Texas. U.S. Bellows, Inc. provides a variety of expansion joints for piping and duct systems and has been a member of the Expansion Joint Manufacturers Association, Inc. since 2002. In December 2011, U.S. Bellows acquired all bellows assets of the former Lortz Manufacturing companies, doubling its manufacturing capabilities. It is a privately held company owned by Durga D. Agrawal. It is a subsidiary of Piping Technology and Products. These companies provide pipe supports and expansion joints to international companies including Dow Chemical Company, Chevron Corporation, ExxonMobil, and Bechtel.

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<span class="mw-page-title-main">Hinged expansion joint</span>

A hinged expansion joint is a metallic assembly, that can rotate in a single plane, used to absorb changes resulting from piping thermal expansion or contraction.

<span class="mw-page-title-main">Toroidal expansion joint</span>

A Toroidal expansion joint is a metallic assembly that consists of a series of toroidal convolutions which are circular tubes wrapped around pipe ends or weld ends and have a gap at the inside diameter to allow for axial stroke while absorbing changes in expansion or contraction of the pipe line. Convolutions are the portion of the bellows that allow it to be flexible. The convolutions are formed around reinforcing bands so that only the concave portion of the torus allows for flexibility. Toroidal expansion joints are typically used in high pressure applications, where little movement is required, and generally used for heat exchangers. Usually, they are hydraulically formed, but others are free formed. These expansion joints are also referred to as "Omega" bellows due to their shape resembling the Greek letter, Omega.

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Metal expansion joints are compensating elements for thermal expansion and relative movement in pipelines, containers and machines. They consist of one or more metal bellows, connectors at both ends, and tie rods that depend on the application. They are differentiated according to the three basic types of movement: axial, angular and lateral expansion joints. Expansion joints have usage in various sectors, like energy production, paper industry, chemical industry, water treatment, oil and gas. Expansion joints can be used wherever thermal movements or vibration occurs in pipelines.

References

  1. EJMA Website, EJMA (retrieved 31 August 2010)
  2. "Rubber bellows life cycle & specification - Modern Building Services". Modern Building Services k. Retrieved 2023-08-19.
  3. "EJMA 10th Edition". Triad Bellows. 2017-04-03. Retrieved 2023-08-19.
  4. "Expansion Joints & Piping Equipment". World of Piping. Retrieved 31 August 2010.
  5. "MACOGA: MACOGA is an official member of EJMA". MACOGA, S.A. Retrieved 2 February 2021.
  6. https://www.unisonhkr.co.kr:40012/
  7. "U.S. Bellows: About Us". U.S. Bellows, Inc. Archived from the original on 4 June 2010. Retrieved 31 August 2010.
  8. "Witzenmann GmbH". Witzenmann GmbH. Retrieved 7 February 2024.

See also