NFPA T3.9.22

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Pump/motor – Pressure rating supplement to NFPA/T2.6.1 R2-2000, Fluid powercomponents – Method for verifying the fatigue and establishing the burstpressure ratings of the pressure containing envelope of a metal fluid powerpump and motor
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 for generating fatiguedistribution data;

    − test and statistical methods for conducting a verification ofthe pressure ratings of the pressure containing envelope onpositive displacement fluid power pump/ motor(s);

    − common requirements and an industry-wide philosophy in judgingone type of pressure capability for fluid power pump/motor(s);

    − uniform methods of product comparison.

    This standard limits conditions as follows:

    − constant amplitude, pressure induced loading of the elementsthat constitute or maintain the pressure containing envelope;

    − pump/motor(s) that are used on systems that use a liquid,rather than a gas to transmit power;

    − product life of at least 100,000 cycles;

    − defined conditions for pressure levels and pulsedurations;

    − temperatures from the charpy impact transition temperature tothe threshold of creep sensitivity;

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

    − materials that are aluminum, magnesium, steel, iron, copperbased alloys, cobalt, titanium, stainless steels, nickel steels andmonel. Specifically excluded are creep sensitive materials such as:zinc, plastic, rubber and sealing devices;

    − cavity failures that will cause fluid to leak to theenvironment are covered by this standard.

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