These requirements cover check valves of 1-inch nominal size and larger@ used in piping systems supplying water for fire protection service. The check valves covered by these requirements are intended for installation and use in accordance with the Standards for: a) Low Expansion Foam and Combined Agent Systems@ NFPA 11; b) Installation of Sprinkler Systems@ NFPA 13; c) Installation of Standpipe and Hose Systems@ NFPA 14; d) Water Spray Fixed Systems for Fire Protection@ NFPA 15; e) Deluge Foam-Water Sprinkler and Spray Systems@ NFPA 16; f) Installation of Centrifugal Fire Pumps@ NFPA 20; g) Water Tanks for Private Fire Protection@ NFPA 22; and h) Installation of Private Fire Service Mains and Their Appurtenances@ NFPA 24.