NFPA/T3.9.22 R2-2000 (R2014)

NFPA/T3.9.22 R2-2000 (R2014)

Standard Title:Pump/motor – Pressure rating supplement to NFPA/T2.6.1 R2-2000, Fluid power components – Method for verifying the fatigue and establishing the burst pressure ratings of the pressure containing envelope of a metal fluid power pump and motorReferenced Standards:NFPA/T2.6.1 R1, ANSI/IEEE 268, ISO 1000, ASTM E466, ISO 5598Standard Scope:This standard provides: test and statistical methods for generating fatigue distribution data; test and statistical methods for conducting a verification of the pressure ratings of the pressure containing envelope on positive displacement fluid power pump/motor(s); common requirements and an industry-wide philosophy in judging one 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 elements that 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 or a least 100,000 cycles; defined conditions for pressure levels and pulse durations; temperatures from the charpy impact transition temperature to the threshold of creep sensitivity; environments which are chemiclaly compatible with the materials of the presure containing envelope; materials that are aluminum, magnesium, steel, iron, copper based alloys, cobalt, titanium, stainless steels, nickel steels and monel. Specifically excluded are creep sensitive materials such as: zinc, plastic, rubber and sealing devices; cavity failures that will cause fluid to leak to the environment are covered by this standard. This standard encourages manufacturers to use this common method to enhance the crdibility of their pressure ratings.

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