BY DAVID M. McGRAILFor most in the American fire service, pressure-regulating devices and specifically pressure-reducing valves (PRVs) were virtually unknown prior to 1991. It was only after the tragic One Meridian Plaza high-rise fire, which occurred in Philadelphia, Pennsylvania, on February 23, 1991, that PRVs became an essential part of the high-rise standpipe operations training curriculum in the American fire service.After One Meridian Plaza, a great deal of attention was paid to PRVs, and many in the fire service started to recognize these devices as a potentially serious problem. A National Fire Protection Association (NFPA) Alert Bulletin (91-3), “Pressure-Regulating Device...

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