Water Hammer 6 : The surge of pressure caused when a high-velocity flow of water is abruptly shut off. The pressure exerted by the flowing water against the closed system can be seven or more times that of the static pressure
NFPA 1962 Standard for the Inspection, Care, and Use of Fire Hose, Couplings, and Nozzles and the Service Testing of Fire Hose, 2008 ed. (Std: Insp, Care and Use of Fr Hose, Couplings, and Nozzles and the Srvc Tst of Fr Hose - Amer) {424 NFC}