MIL-HDBK-1003/3
b)
Boiler plant's turndown ratio.
c) Provisions for future loads and standby for
essential loads where applicable.
2.2.2.2
Boiler Fuel. Refer to MIL-HDBK-1003/6 for information
on how to select boiler fuel. Consider Navy criteria, fuel and
life-cycle costs, and Federal and local emission standards.
2.2.2.3
Auxiliary Equipment. Refer to MIL-HDBK-1003/6 and Navy
guide specifications for information on types and sizing of
auxiliary equipment. Some notes on plant equipment are as
follows:
a) Centrifugal Pumps. Check the system net positive
suction head (NPSH) as well as the pump NPSH in the design. In
the past, engineers frequently specified non-overloading type
pumps. Today, pumping energy costs sometimes dictate other ways
to arrange pump operating points. Do not oversize pumps. Refer
to the ASHRAE Handbook, Fundamentals and the Hydraulic Institute
standards for guidance on design of centrifugal pumping systems.
b) Non-Hermetic Motors. Refer to ASHRAE Handbook,
Fundamentals; NFPA 70, National Electrical Code; and National
Electrical Manufacturers Association (NEMA) standards for
guidance on selecting motors and motor protective devices.
c) Hermetic Motors. Hermetic motors are used in
refrigeration compressors, selected by the equipment
manufacturer, and protected as required by NFPA 70.
d) Engine and Turbine Drives. Consult ASHRAE
Handbook, Fundamentals and applicable NFPA standards for design
guidance on the application of engines and turbines used to drive
compressors, fire pumps, power generators, and co-generation
equipment.
2.2.2.4
Terminal Equipment. Select and size terminal equipment
in accordance with ASHRAE Handbook, Fundamentals. Economic as
well as engineering considerations shall set the flow,
temperature, temperature drop, pressure, and pressure drop for
central plant equipment; distribution piping and fittings; and
terminal equipment parameters. If new terminal equipment is
added to an existing plant, ensure that the new system piping and
valves will not disturb the proper operation of existing
distribution system.
2.2.3
Cooling Equipment
7
Previous Page
