UFC 3-420-01
25 October 2004
raised floor supply plenums."
C.
Add "SECTION 301.7 Protection of building materials. Where the
seasonal design temperature of the cold water entering a building is below the seasonal
design dew point of the indoor ambient air, and where condensate drip will cause
damage or create a hazard, insulate plumbing piping with a vapor barrier type of
insulation to prevent condensation. All chilled water piping from a central drinking water
cooling system should be insulated with vapor barrier type insulation to prevent
condensation."
D.
Add "SECTION 301.8 Protection of computers, telephone switches and
terminal equipment, and other electronic equipment from water damage. Neither
water nor drainage piping will be located over electrical wiring or equipment unless
adequate protection against water (including condensation) damage has been provided.
Insulation alone is not adequate protection against condensation.
301.8.1
Dedicated computer, telephone, and other electronic equipment.
These areas within buildings should be located to minimize exposure to water
and other listed hazards from adjoining areas and activities; refer to NFPA-75,
Protection of Electronic Computer/Data Processing Equipment.
301.8.2
Prohibited piping. Chilled water piping, domestic water piping,
sanitary drains, roof drains, gas lines, fuel oil lines, steam lines, water mains, and
other utility lines not serving the electronic equipment area are prohibited from
the electronic equipment and record storage areas.
301.8.3
Restricted piping. Utilities containing water or other fluids, which
serve the electronic equipment and record storage areas, are not to be routed to
pass directly over electronic equipment or stored records, whether the utilities are
installed over or below the finished ceiling.
301.8.4
Waterproof floor above. The floor above each of the electronic and
records storage rooms should be waterproofed to prevent passage of accidental
spillage. As an alternative, allow no prohibited pipe in the rooms above the
electronic equipment and record storage areas.
E.
SECTION 303.3 Plastic pipe, fittings and components. Add after the last
sentence: "Installation procedure for plastic piping materials will be in accordance with
the Plastic Pipe Institute (PPI) Handbook of Polyethylene Pipe. Design parameters
such as thermal movement, chemical resistance, flow characteristics, and pressure
ratings are covered in PPI publications. The designer should be aware that some
schedule 40 plastic pipes do not have the strength of a schedule 40 steel pipe;
therefore, the desired working temperature and pressure ratings for any plastic piping
specified must be indicated either in the specifications or on the drawings."
F.
SECTION 305.6 Freezing. Add after the last sentence: "Although insulating
A-2
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