01-06M
4.2 Plumbing fixtures shall be located where indicated by VA Program Guide
7610 (Equipment Guide List).
5. WATER DISTRIBUTION SYSTEMS
5.1 See Article, PLUMBING FIXTURE SCHEDULES, for fixture units and minimum
fixture branch sizes.
5.2 Size the piping for the hot and cold water systems not to exceed the
maximum velocity allowed by the National Standard Plumbing Code.
Provide water hammer arrestors in accordance with ASSE 1010 for sealed
wall installations without an access panel. Size and locate arrestors
per Plumbing Drainage Institute (PDI).
5.3 Provide wall hydrants a maximum of 60 m (200 feet) apart, at loading
docks and at building entrances, with a minimum of one wall hydrant on
each exterior wall.
5.4 Maintain a minimum pressure of 240 kPa (35 psi) at plumbing fixtures on
top floor.
5.5 Coordinate electrical supply to electronic faucets and flush valves.
6. DOMESTIC WATER BOOSTER SYSTEM
6.1 Use a three pump system. Size one pump for approximately one-third of
the total water demand. Each of the other pumps shall be sized for
approximately two-thirds of the total demand. The smaller will operate
until water demand exceeds the pump's capacity, at which point it will
stop and one of the other larger pumps shall start. When the demand
exceeds the capacity of this larger pump, the smaller pump will
restart and both pumps will operate together. The other large pump
will be a standby and alternate with the first large pump. Provide a
pneumatic tank and "NO-FLOW" shut-down controls.
6.2 Provide emergency power to each pump.
7. DOMESTIC HOT WATER SYSTEMS
7.1 Provide duplex shell and steam coil central water heaters with the
capacity of generating the flow demand at 60 degrees C (140 degrees F)
with each heater sized to supply 50% of demand. However, the heater
discharge temperature shall be set at 54 degrees C (130 degrees F).
Provide a water temperature alarm system on heater discharge, or where
water enters the piping system. Temperature limit stop of Type T/P
thermostatic and pressure balancing valve shall be set at 40 degrees C
(105 degrees F). Dietetic facilities shall be provided the flow demand
at 60 degrees C (140 degree F). Use recirculating system.
7.2 Size each heater based on modified Hunter's Curve (Hot and Cold Water
Section, ASHRAE GUIDE AND DATA BOOK) and fixture unit count indicated
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