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Mechanical snubber

Structural connector designed to protect from shock

Mechanical snubber
Summary

Structural connector designed to protect from shock

A mechanical snubber is a mechanical device designed to protect components from excess shock or sway caused by seismic disturbances or other transient forces. During normal operating conditions, the snubber allows for movement in tension and compression. When an impulse event occurs, the snubber becomes activated and acts as a restraint device. The device becomes rigid, absorbs the dynamic energy, and transfers it to the supporting structure.

The image at right shows an isometric view of one style of mechanical snubber. When a disturbance occurs that exceeds the acceleration threshold of the snubber, the ball screw and drum produce angular momentum to the inertia mass. The inertial resistance of the mass engages the resilient capstan to tighten around a hardened mandrel, which is part of the structural tube. This, in turn, causes restraining force against the rotation of the ball screw. During standard operation, the associated acceleration is far below the threshold limit of the snubber and will not activate the capstan spring.

Applications

thumb|alt=Mechanical Snubber in the Field|Mechanical Snubber in Application - Piping Technology Process Impulse Events

  • water hammer
  • tripped valve
  • pipe rupture
  • protection from overtravel or overstress by reducing the structural response

External impulse events

  • seismic event (such as an earthquake)
  • unexpected failure of adjacent components
  • high wind loads

References

References

  1. [http://opus.mcerf.org/specialtyitem.aspx?id=-1350804529785617487 Specialty Item Gauges] OPUS (Online Piping & Usage Specification), (retrieved 28 September 2010)
  2. [http://www.pipingtech.com/products/ptpcat/spring/hydraulic/mech.htm Mechanical Snubber Assemblies] Piping Technology & Products, Inc. Catalog, (retrieved 28 September 2010)
  3. [http://www.wermac.org/steel/pipesupports.html Pipe Supports] Explore the World of Piping, (retrieved 28 September 2010)
  4. [http://www.pipingtech.com/products/snubbers_mech.htm Mechanical Snubber] Piping Technology & Products, Inc., (retrieved 28 September 2010)
  5. [http://www.igin.com/article-1684-can-you-believe-that-gauge.html Can You Believe that Gauge?] Workman, Larry, Sept. 23, 2010, (retrieved 28 September 2010)
  6. [http://www.allbusiness.com/operations/disaster-preparedness/111145-1.html Seismic stops for nuclear power plants] Anderson, P.H., Oct. 1, 1989, (retrieved 28 September 2010)
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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