Department of Facilities Services
Chilled Water Distribution System
2013 Design Guidelines 22 | Page
Compressed air tubing must be copper or stainless steel from isolation valve to instrument or control valve and shall be
run in a manner that will not promote trapping of water. Each end-user of compressed air shall have individual isolation
valves and control valves with positioners which shall have filters and separators with have fully automatic drains.
Compressed air lines must be sized for all components using their delivery rates. Branch lines shall be 3/8 inch minimum
with no more than 5 feet from the isolation valve to the pressure set or solenoid. If more than two components are being
served main line size should be run to the last component served.
Install four thermometers; four temperature sensors; flow meter; pressure differential transmitter with local digital
readout and remote pressure differential transmitter as per flow diagrams between the four bridge isolation valves.
Install V-Cone flow meter, supplied by the University, as per flow diagram. The preferred meter installation is in
horizontal pipe runs. For a meter being installed in same size bridge piping there shall be a minimum of 5 pipe diameters
before the meter and three pipe diameters after the meter. If installing smaller meter than the bridge piping, have four
pipe diameters between the meter flanges and the reducers on both sides of the meter, the same requirement shall be used
for any fittings used adjacent to the meter. For horizontal installation, this meter must be installed in either the three o’clock
or nine o’clock positions or a maximum of 45 degrees below these positions. If the meter must be installed in a vertical run,
the flow must come from under the meter so that the cone will not entrap air. The meter must not be installed downstream
from a control valve. The meter must not be installed in the highest point of a pipe system.
BUILDING CHILLED WATER PUMP
Design Criteria
Pump sizes, capacities, pressures and operating characteristics shall be as scheduled. Where pumps are indicated for
parallel operation, each pump must be capable of delivering at least 80% of the building’s full load flow.
Pumps shall have a minimum clearance of 24" on sides and ends of pumps and motors to allow access for service and
repair. Pumps shall have isolation valves to allow removal of pumps for repair. Pumps shall have bleed valves and gauge
ports at accessible locations. All pumps shall be serviceable without removing the volute from piping connections. Pumps
shall meet or exceed operating efficiencies scheduled.
Furnish pumps complete with premium efficiency inverter-duty motors, drive assemblies, coupling guard where required
and accessories as specified. Select motor with sufficient horsepower rating for non-overloading operation over entire
pump curve.
(81 pages)
(48 pages)
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