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NFPA T3.29.2

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Pressure switch – Pressure rating supplement to NFPA/T2.6.1 R2-2000, Fluidpower components – Method for verifying the fatigue and establishing theburst pressure ratings of the pressure containing envelope of a metal fluidpower pressure switch
Revision R2, March 15, 2000
Includes all amendments and changes through Reaffirmation Notice , 2014

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Description

  • 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:8
  • ANSI Approved:No
  • DoD Adopted:No
  • This standard provides:

    − test procedures for conducting a verification of the fatigueand establishment of burst pressure ratings on pressure switchenvelopes;

    − test and statistical methods for generating fatiguedistribution data;

    − common requirements and an industry wide philosophy in judgingone type of pressure capability for fluid power pressureswitches;

    − 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;

    − 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.

    This standard does not include functional performance of apressure switch, nor the ability to maintain a set point, wheneither the rated fatigue pressure or the rated burst pressure hasbeen applied to the pressure containing envelope.