NFPA T3.20.8

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Quick-action coupling – Pressure rating supplement to NFPA/T2.6.1 R2-2000,Fluid power components – Method for verifying the fatigue and establishingthe burst pressure rating of the pressure containing envelope of a metalfluid power quickaction coupling
Revision R2, March 15, 2000
Includes all amendments and changes through Reaffirmation Notice , 2014

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  • Revision:Revision R2, March 15, 2000
  • Published Date:January 2014
  • Status:Active, Most Current
  • Document Language:English
  • Published By:National Fluid Power Association ((NFPA))
  • Page Count:9
  • ANSI Approved:No
  • DoD Adopted:No
  • This standard provides: − test and statistical methods forgenerating fatigue-distribution data;

    − test and statistical methods for verifying the pressureratings of quick-action couplings;

    − common requirements and an industry-wide philosophy forjudging one type of pressure capability for quick-actioncouplings;

    − uniform methods of product comparison. 

    This standard limits conditions as follows:

    − pressure-induced loadings of constant amplitude;

    − product life of at least 100,000 cycles;

    − pressure levels and pulse durations as defined in NFPA/T2.6.1R2, clause 8;

    − temperatures that range from the Charpy impact transitiontemperature to the threshold of creep sensitivity;

    − environments which are chemically compatible with thematerials in the pressure-containing envelope;

    − materials that are aluminum, magnesium, iron, steel, stainlesssteel, cobalt, titanium, copper-based alloys, nickelbased alloys,or monel. Specifically excluded are creep-sensitive materials suchas zinc, plastic, rubber and sealing devices;

    − quick-action couplings which are connected and disconnected bya linear or rotational motion, or both;

    − quick-action couplings with or without sealing means whenuncoupled.

    This standard encourages manufacturers to use this common methodto enhance the credibility of their pressure ratings.