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 necessary water hammer arrestors.
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.
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 SYSTEM:
7.1
Laundry equipment heaters are designed and provided by separate
contract (VA will furnish and install in conjunction with laundry
equipment).
The remainder of a laundry building shall be served
with a simplex shell and steam coil electrical or gas central
heater with the capacity of generating the flow demand at 60
degrees C (140 degrees F). However, heater discharge shall be 54
degrees C (130 degrees F). Consider Legionnaires disease, energy
consumption and initial cost when selecting a circulating system.
7.2
Size heater based on modified Hunter's Curve (Hot and Cold Water
Section, ASHRAE GUIDE AND DATA BOOK) and fixture unit count
indicated in Article, PLUMBING FIXTURE SCHEDULES.
7.3
Size the hot water supply and return lines by the heat loss method
as outlined in the ASHRAE GUIDE AND DATA BOOK, not to exceed 5
degrees C (10 degrees F) heat loss. Dead ends shall be limited to
6 m (20 feet).
7.4
Provide combination shut-off and balancing valves in the hot water
return circulating lines.
DRINKING WATER EQUIPMENT: Provide wall hung, self-contained, electric,
8.
wheelchair accessible, water coolers.
9.
SANITARY AND STORM DRAINAGE SYSTEMS:
9.1
See Article, PLUMBING FIXTURE SCHEDULES, for fixture units and
waste/vent minimum fixture branch sizes.
9.2
Base storm frequency on local code.
9.3
Do not drain outside building sub-soil drain tile to an interior
sump pump. If a pump is required, locate it outside of the
building.
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