NFPA/T3.20.8 R2-2000 (R2014)
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NFPA/T3.20.8 R2-2000 (R2014)Standard Title:Quick-action coupling – Pressure rating supplement to NFPA/T2.6.1 R2-2000, Fluid power components – Method for verifying the fatigue and establishing the burst pressure rating of the pressure containing envelope of a metal fluid power quick-action couplinReferenced Standards:NFPA/T2.6.1 R1, ISO 1000, ASTM E466, ISO 5598Standard Scope:This standard provides: test and statistical methods for generating fatigue-distribution data; test and statistical methods for verifying the pressure ratings of quick-action couplings; common requirements and an industry-wide philosophy for judging one type of pressure capability for quick-action couplings; 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/T2.6.1 R2, clause 8; temperatures that range from the Charpy impact transition temperature to the threshold of creep sensitivity; environments which are chemically compatible with the materials in the pressure-containing envelope; materials that are aluminum, magnesium, iron, steel, stainless steel, cobalt, titanium, copper-based alloys, nickel-based alloys, or monel. Specifically excluded are creep-sensitive materials such as zinc, plastic, rubber and sealing devices; quick-action couplings which are connected and disconnected by a linear or rotational motion, or both; quick-action couplings with or without sealing means when uncoupled. This standard encourages manufacturers to use this common method to enhance the credibility of their pressure ratings.