NFPA T3.20.8

http://www.documentbays.org/77230-nfpa-t3208.html

1 Scope1.1 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-actioncouplings;− uniform methods of product comparison.

1.2 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, nickelbasedalloys, or monel. Specifically excluded are creep-sensitive materials such as zinc, plastic, rubber and sealingdevices;− 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.

1.3 This standard encourages manufacturers to use this common method to enhance the credibility of their pressureratings.