given in Table 17.
h) Ventilating rates are based on 104deg. F (40deg. C) or 122
deg. F (50deg. C) ambient temperatures for the generators, motors, and
switchgear. Higher permissible ambient temperatures and lower temperatures
rises for the electric equipment will affect the rates accordingly. When an
indoor engine room design temperature exceeds 122deg. F (50deg. C), use
top-guided generator air discharges in conjunction with power roof
ventilators to avoid recirculation. Maintain suitable ambient air
temperatures entering the generators.
18.104.22.168 Battery Room. Battery rooms should normally be exhausted at a
minimum rate of 800 cfm (22.6 cubic meters per minute) or 6
air-changes-per-hour, whichever is greater. This will prevent hazardous
hydrogen gas buildups. Fans shall have nonsparking wheels and motors shall
be located out of the air stream.
Minimum Engine Room Ventilation
Cubic Feet per Minute per Installed
Kilowatt Generating Capacity of
the Engine Room
of deg. F (deg. C)
Summer Design Outdoor
Above 100deg. (38deg.)
90deg. (32deg.) -
Below 90deg. (32deg.)
control rooms, switchgear rooms, offices, critical parts storage, and repair
rooms, where warranted by climatic conditions of the station. Mechanical
ventilation may be adequate in many cases. Note that an economic analysis
rooms. A DOD waiver is required.
Refer to NAVFAC DM-3.01, Plumbing Systems.
15.7.1 Drains. Provide drains for the following and for all drain and drip
cooling water from pump stuffing boxes, and similar sources,
and other water treatment systems,