c) Over-Temperature Alarms. Include over-temperature
alarm signal system in electronic equipment facilities not having
continuous occupancy during operation. This system shall consist
of at least one cooling-type thermostat in the electronic
equipment room, and an audio alarm in the occupied control
center. For normal operations, set the thermostat to activate
the alarm when the facility temperature reaches 90 degrees F.
Alarm circuit activation at lower temperatures can be used if
dictated by electronic equipment requirements.
d) Thermometers. Thermometer wells can be used in
lieu of fixed permanent thermometers. Table 2 provides typical
locations for thermometers in piping systems.
e) Pressure Gages. Pressure gage tappings with cocks
can be used in lieu of fixed, permanent pressure gages. Provide
pressure gages as indicated in Table 2.
Metering. Comply with NAVFAC Maintenance and Operation
Manual (MO)-209, Maintenance of Steam, Hot Water, and Compressed
Air Distribution Systems, MO-220, Maintenance and Operation of
Gas Systems, and MO-230, Maintenance Manual Petroleum Fuel
Facilities. For Air Force projects, comply with Air Force
Engineering Technical Letter (ETL) 94-2, Utility Meters in New
and Renovated Facilities. Meter new buildings to monitor energy
consumption, verify proper system operation, and validate results
of energy analysis and savings.
220.127.116.11 Sizing. Pipe sizing and maximum pipe velocities shall
be in conformance with ASHRAE Handbook, Fundamentals. Refer to
Section 7 for additional information on design of piping systems.
18.104.22.168 Pipe Expansion. Preferred methods of accommodating
thermal expansion is by pipe geometry, e.g., offsets and changes
in direction, and by pipe loops. Use expansion joints only when
space does not permit proper geometry or installation of pipe
Duct System Design
a) Duct Sizing. ASHRAE Handbook, HVAC Systems and
Applications offers three methods of sizing duct system; the
equal friction method; the static regain method; and the
T-method. The designer shall choose the method that he thinks is
most appropriate for the particular system, and then design