2.3.1
Backwater Valves
Backwater valves shall be either separate from the floor drain or a
combination floor drain, "P" trap, and backwater valve, as shown. Valves
shall have cast-iron bodies with cleanouts large enough to permit removal
of interior parts. Valves shall be of the flap type, hinged or pivoted,
with revolving disks. Hinge pivots, disks, and seats shall be nonferrous
metal. Disks shall be slightly open in a no-flow, no-backwater condition.
Cleanouts shall extend to finished floor and be fitted with threaded
countersunk plugs.
2.3.2
Wall Faucets
Wall faucets with vacuum breaker backflow preventer shall be brass with 20
mm 3/4 inch male inlet threads, hexagon shoulder, and 20 mm 3/4 inch hose
connection. Faucet handle shall be securely attached to stem.
2.3.3
Wall Hydrants
Wall hydrants with vacuum breaker backflow preventer shall have a
nickel-brass or nickel-bronze wall plate or flange with nozzle and
detachable key handle. A brass or bronze operating rod shall be provided
within a galvanized iron casing of sufficient length to extend through wall
so that the valve is inside the building, and the portion of the hydrant
between the outlet and valve is self-draining. A brass or bronze valve
with coupling and union elbow having metal-to-metal seat shall be provided.
Valve rod and seat washer shall be removeable through the face of the
hydrant. The hydrant shall have 20 mm 3/4 inch exposed hose thread on
spout and 20 mm 3/4 inch male pipe thread on inlet.
2.3.4
Lawn Faucets
Lawn faucets shall be brass, with either straight or angle bodies, and
shall be of the compression type. Body flange shall be provided with
internal pipe thread to suit 20 mm 3/4 inch pipe. Body shall be suitable
for wrench grip. Faucet spout shall have 20 mm 3/4 inch exposed hose
threads. Faucet handle shall be securely attached to stem.
2.3.5
Yard Hydrants
Yard box or post hydrants shall have valve housings located below frost
lines. Water from the casing shall be drained after valve is shut off.
Hydrant shall be bronze with cast-iron box or casing guard. "T" handle key
shall be provided.
2.3.6
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NOTE: The routing of the discharge piping should be
shown on the drawings.
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Water heaters and hot water storage tanks shall have a combination pressure
and temperature (P&T) relief valve. The pressure relief element of a P&T
relief valve shall have adequate capacity to prevent excessive pressure
buildup in the system when the system is operating at the maximum rate of
heat input. The temperature element of a P&T relief valve shall have a
relieving capacity which is at least equal to the total input of the
heaters when operating at their maximum capacity. Relief valves shall be
SECTION 15405A
Page 27
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