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In mechanical engineering, an end-face mechanical seal is a type of seal used in rotating equipment, such as pumps, mixers, blowers, and compressors. When a pump operates, the liquid could leak out of the pump between the rotating shaft and the stationary pump casing. Since the shaft rotates, preventing this leakage can be difficult. Earlier pump models used mechanical packing to seal the shaft. Since World War II, mechanical seals have replaced packing in many applications.
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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.
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.
A metal hose is a flexible metal line element. There are two basic types of metal hose that differ in their design and application: stripwound hoses and corrugated hoses.
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.
Primetals Technologies Limited, is an engineering and plant construction company headquartered in London, United Kingdom, with numerous locations worldwide. It serves clients in the metals industry, both the ferrous and the nonferrous metals sector. It was established as a joint venture between Siemens VAI Metals Technologies and Mitsubishi-Hitachi Metals Machinery in 2015. As of 2020, Primetals Technologies is a joint venture of Mitsubishi Heavy Industries and partners.
References
- ↑ EJMA Website, EJMA (retrieved 31 August 2010)
- ↑ "Rubber bellows life cycle & specification - Modern Building Services". Modern Building Services k. Retrieved 2023-08-19.
- ↑ "EJMA 10th Edition". Triad Bellows. 2017-04-03. Retrieved 2023-08-19.
- ↑ "Expansion Joints & Piping Equipment". World of Piping. Retrieved 31 August 2010.
- ↑ "MACOGA: MACOGA is an official member of EJMA". MACOGA, S.A. Retrieved 2 February 2021.
- ↑ "U.S. Bellows: About Us". U.S. Bellows, Inc. Archived from the original on 4 June 2010. Retrieved 31 August 2010.
- ↑ "Witzenmann GmbH". Witzenmann GmbH. Retrieved 7 February 2024.
- ↑ https://www.unisonhkr.co.kr:40012/
