4.
PLUMBING FIXTURES
4.1
Plumbing fixture numbers, description, fixture units and minimum
branch sizes are indicated in Article, PLUMBING FIXTURE SCHEDULES.
4.2
Plumbing fixtures shall be located where indicated by VA Program
Guide 7610, Equipment Guide List. In addition to the locations
indicated in Program Guide 7610, emergency showers and eye/face
wash fixtures shall be provided in laundries (near exterior
filling pipes for liquid supply storage tanks and at exterior
central liquid supply area); pesticide storage and mixing areas;
and other areas where hazardous chemicals are used such as boiler
rooms, cooling towers, and some water treatment areas.
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 in accordance with
ASSE 1010 for sealed wall installations without an access panel.
Size and locate arrestors per Plumbing Drainage Institute (PDI)
requirements.
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 the plumbing
fixtures on top floor.
5.5
Coordinate electrical supply to electronic faucets and flush
valves.
5.6
Provide solenoid valve on cold water supply to the dental utility
junction centers with control switch located in the reception
area.
5.7
Provide cold water connection and/or treated water with backflow
preventer to the Controlled Temperature Room humidification
system.
6.
DOMESTIC WATER BOOSTER SYSTEM
6.1
Hospital Building: 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. Provide emergency
power.
6.2
Other Buildings: Use a two pump system. Size each pump for 75
percent of the total water demand. Pumps shall alternate. When the
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