Double-Check Backflow-Prevention Assemblies: Standard: ASSE 1015. Operation: Continuous-pressure applications, unless otherwise indicated. Body: Bronze for NPS 2 and smaller; cast iron with interior lining complying with AWWA C550 or that is FDA approved for NPS 2-1/2 and larger. End Connections: Threaded for NPS 2 and smaller; flanged for NPS 2-1/2 and larger. Accessories: Valves: Ball type with threaded ends on inlet and outlet of NPS 2 and smaller; outside screw and yoke gate-type with flanged ends on inlet and outlet of NPS 2-1/2 and larger. Manufacturers: Watts or Febco. BLADDERTYPE EXPANSION TANKS Construction: Welded steel, tested and stamped in accordance with ASME SEC 8 D; supplied with National Board Form U 1, rated for working pressure of 125 psig, with flexible butyl rubber bladder sealed into tank and steel support stand. Accessories: Pressure gauge and aircharging fitting, tank drain. Manufacturer: Taco Series CA or equivalent. POTABLE WATER PRESSURE BOOSTER SYSTEMS. All piping, fittings and booster pump wetted surfaces are to be non-ferrous, except that stainless steel materials may be used. Booster pumps are to be skid mounted packaged duplex assemblies with variable frequency drives. The pump motors are to be factory fitted with Helwig shaft grounding assemblies. CLEANOUTS Exterior Surfaced Areas: Round or Square cast nickel bronze access frame and nonskid cover. Interior Finished Floor Areas: cast iron body and frame, nickel bronze top to accommodate the following floor finishes as required: Exposed rim type with recess to receive terrazzo or resilient floor finish. Exposed finish type with standard mill finish. Exposed flush type with standard scored or abrasive finish. Concealed undercarpet flush type with mill finish and carpet marker. Interior Finished Wall Areas: Line type with cast iron body and round gasket cover and round stainless steel access cover secured with machine screw. Interior Unfinished Accessible Areas: Caulked or threaded type. WATER HAMMER ARRESTERS Standard: ASSE 1010 or PDI-WH 201. Type: Josam 75000 Series water hammer arresters or equal.
Double-Check Backflow-Prevention Assemblies: Standard: ASSE 1015. Operation: Continuous-pressure applications, unless otherwise indicated. Body: Bronze for NPS 2 and smaller; cast iron with interior lining complying with AWWA C550 or that is FDA approved for NPS 2-1/2 and larger. End Connections: Threaded for NPS 2 and smaller; flanged for NPS 2-1/2 and larger. Accessories: Valves: Ball type with threaded ends on inlet and outlet of NPS 2 and smaller; outside screw and yoke gate-type with flanged ends on inlet and outlet of NPS 2-1/2 and larger. Manufacturers: Watts or Febco. BLADDERTYPE EXPANSION TANKS Construction: Welded steel, tested and stamped in accordance with ASME SEC 8 D; supplied with National Board Form U 1, rated for working pressure of 125 psig, with flexible butyl rubber bladder sealed into tank and steel support stand. Accessories: Pressure gauge and aircharging fitting, tank drain. Manufacturer: Taco Series CA or equivalent. POTABLE WATER PRESSURE BOOSTER SYSTEMS. All piping, fittings and booster pump wetted surfaces are to be non-ferrous, except that stainless steel materials may be used. Booster pumps are to be skid mounted packaged duplex assemblies with variable frequency drives. The pump motors are to be factory fitted with Helwig shaft grounding assemblies. CLEANOUTS Exterior Surfaced Areas: Round or Square cast nickel bronze access frame and nonskid cover. Interior Finished Floor Areas: cast iron body and frame, nickel bronze top to accommodate the following floor finishes as required: Exposed rim type with recess to receive terrazzo or resilient floor finish. Exposed finish type with standard mill finish. Exposed flush type with standard scored or abrasive finish. Concealed undercarpet flush type with mill finish and carpet marker. Interior Finished Wall Areas: Line type with cast iron body and round gasket cover and round stainless steel access cover secured with machine screw. Interior Unfinished Accessible Areas: Caulked or threaded type. WATER HAMMER ARRESTERS Standard: ASSE 1010 or PDI-WH 201. Type: Josam 75000 Series water hammer arresters or equal.
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