Coffee Break Training: Hazardous Materials: Compressed Gas Cylinder Control Valve Safety Systems   [open pdf - 129KB]

"High- or low-pressure steel and aluminum compressed gas cylinders are common objects found in a variety of occupancies: schools, health care facilities, industry, businesses, fire and ambulance stations, even residential occupancies. The cylinder may contain products that are asphyxiants, corrosive, flammable, cryogenic, inert, oxidizing, pyrophoric or toxic/poisonous gases. The cylinders are filled or emptied through main control valves such as the one illustrated today. Standard cylinder valve outlet connections have been devised by the Compressed Gas Association (CGA) to prevent mixing of incompatible gases (CGA V9, 'Standard for Compressed Gas Cylinder Valves'). Valves are designed to comply with safety system criteria as follows, depending upon the pressure rating and application. Low-pressure cylinders store their contents at less than 900 pounds per square inch gauge (psig) (62 bar), while high-pressure cylinders are for products greater than 900 psig (62 bar) up to about 7,500 psig (517 bar). [..] The outlet threads that are used vary in diameter; some are internal, and some are external; some are right-handed, and some are left-handed. To minimize undesirable connections, only CGA standard combinations of valves and fittings should be used in compressed gas installations. The threads on cylinder valves, regulators and other fittings should be examined to ensure that they correspond and are undamaged before any connections are made. Connections should never be joined by force." This Coffee Break Training includes a chart with safety system designation and accompanying descriptions for each designation.

Report Number:
Coffee Break Training - Fire Protection Series No. FP-2014-43
Public Domain
Retrieved From:
U.S. Fire Administration: http://www.usfa.fema.gov/
Media Type:
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