specimen have passed the specified salt spray fog
test. A 125 hour test will be specified in a
noncorrosive environment and a 500 hour test will be
specified in a corrosive environment.
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Unless otherwise specified, equipment and component items, when fabricated
from ferrous metal, shall be factory finished with the manufacturer's
standard finish, except that items located outside of buildings shall have
weather resistant finishes that will withstand [125] [500] hours exposure
to the salt spray test specified in ASTM B 117 using a 5 percent sodium
chloride solution. Immediately after completion of the test, the specimen
shall show no signs of blistering, wrinkling, cracking, or loss of adhesion
and no sign of rust creepage beyond 3 mm 1/8 inch on either side of the
scratch mark. Cut edges of galvanized surfaces where hot-dip galvanized
sheet steel is used shall be coated with a zinc-rich coating conforming to
ASTM D 520, Type I.
2.7.2
Factory Applied Insulation
[Refrigerant suction lines between the cooler and each compressor [and cold
gas inlet connections to gas cooled motors]] [Refrigerant pumps and exposed
chilled water lines on absorption chillers] shall be insulated with not
less than 19 mm (3/4 inch) 3/4 inch thick unicellular plastic foam.
Factory insulated items installed outdoors are not required to be
fire-rated. As a minimum, factory insulated items installed indoors shall
have a flame spread index no higher than 75 and a smoke developed index no
higher than 150. Factory insulated items (no jacket) installed indoors and
which are located in air plenums, in ceiling spaces, and in attic spaces
shall have a flame spread index no higher than 25 and a smoke developed
index no higher than 50. Flame spread and smoke developed indexes shall be
determined by ASTM E 84. Insulation shall be tested in the same density
and installed thickness as the material to be used in the actual
construction. Material supplied by a manufacturer with a jacket shall be
tested as a composite material. Jackets, facings, and adhesives shall have
a flame spread index no higher than 25 and a smoke developed index no
higher than 50 when tested in accordance with ASTM E 84.
2.8
FIELD APPLIED INSULATION
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NOTE: Use the first bracketed statement for Army
projects and delete Navy reference, and vice versa.
**************************************************************************
Field applied insulation shall be provided and installed in accordance with
Section [15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS] [15080N
MECHANICAL INSULATION].
PART 3
EXECUTION
3.1
INSTALLATION
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NOTE: Belowground refrigerant piping should be
avoided if at all possible. Direct buried
refrigerant piping will not be installed under any
circumstances. In the event that belowground pipe
routing is the only alternative, the piping will be
SECTION 15182
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