1. Plain-end fittings with locking lugs or shear bolts are not permitted. 2. Piping sizes 50 mm (2 inches) and smaller shall be black steel Schedule 40 with threaded end connections. 3. Piping sizes 65 mm (2 ½ inches) and larger shall be black steel Schedule 10 with grooved connections. Grooves in Schedule 10 piping shall be rolled grooved only. 2.3 VALVES A. General: 1. Valves shall be in accordance with NFPA 13. 2. Do not use quarter turn ball valves for 50 mm (2 inch) or larger drain valves. Control Valve: Shall be a manually operated outside stem and yoke (OS&Y) type. Dry-pipe Valve: Shall be a latching differential type. be complete with trim piping, valves, fittings, pressure gauges, priming water fill cup, velocity drip check, drip cup, and other ancillary components as required for proper operation. For dry-pipe sprinkler systems with volumes more than 1893 L (500 gal), provide a quick opening device unless water delivery time calculations have proven no quick opening device is required. Shall be capable of external reset. SPEC WRITER NOTE: Include valves for system that require fire department connections. //D. Check Valve: Shall be of the swing type with a flanged cast iron body and flanged inspection plate.// SPEC WRITER NOTE: Include an automatic ball drip where a fire department connection is provided. //E. Automatic Ball Drips: Cast brass 20 mm (3/4 inch) in-line automatic ball drip with both ends threaded with iron threads. // SPEC WRITER NOTE: Where the VA Plumbing Design Manual requires a backflow preventer, enact the following requirement.
1. Plain-end fittings with locking lugs or shear bolts are not permitted. 2. Piping sizes 50 mm (2 inches) and smaller shall be black steel Schedule 40 with threaded end connections. 3. Piping sizes 65 mm (2 ½ inches) and larger shall be black steel Schedule 10 with grooved connections. Grooves in Schedule 10 piping shall be rolled grooved only. 2.3 VALVES A. General: 1. Valves shall be in accordance with NFPA 13. 2. Do not use quarter turn ball valves for 50 mm (2 inch) or larger drain valves. Control Valve: Shall be a manually operated outside stem and yoke (OS&Y) type. Dry-pipe Valve: Shall be a latching differential type. be complete with trim piping, valves, fittings, pressure gauges, priming water fill cup, velocity drip check, drip cup, and other ancillary components as required for proper operation. For dry-pipe sprinkler systems with volumes more than 1893 L (500 gal), provide a quick opening device unless water delivery time calculations have proven no quick opening device is required. Shall be capable of external reset. SPEC WRITER NOTE: Include valves for system that require fire department connections. //D. Check Valve: Shall be of the swing type with a flanged cast iron body and flanged inspection plate.// SPEC WRITER NOTE: Include an automatic ball drip where a fire department connection is provided. //E. Automatic Ball Drips: Cast brass 20 mm (3/4 inch) in-line automatic ball drip with both ends threaded with iron threads. // SPEC WRITER NOTE: Where the VA Plumbing Design Manual requires a backflow preventer, enact the following requirement.
VA211316.docx