2.11.5
Insulation for Flanges, Unions, Valves, and Fittings
Flanges, unions, valves, and fittings shall be insulated with premolded
prefabricated, or field fabricated segments of insulation of the same
material and thickness as the manhole pipe insulation. Insulation shall be
removable and reusable and shall have essentially the same thermal
characteristics and thickness as the adjoining piping.
2.11.6
Vapor Barrier Coating
The vapor barrier coating shall be fire and water resistant and
appropriately selected for either outdoor or indoor service. Color shall
be white. The water vapor permeance of the compound shall not exceed 0.05
perm and shall be determined according to Procedure B of ASTM E 96. The
coating shall be a nonflammable, fire resistant type conforming to ASTM E 84,
NFPA 90A and UL 723. The flash point of the compound shall not be less
than 26.7 degrees C 80 degrees F and shall be determined in accordance with
ASTM D 3278. All other application and service properties shall be in
accordance with ASTM C 647.
2.11.7
Finishing Cement
Mineral fiber hydraulic-setting thermal insulating cement in accordance
with ASTM C 449/C 449M.
2.11.8
Glass Tape
Glass tape shall meet the requirements of UL 723 and ASTM E 84.
2.11.9
Plain Weave, Untreated
The ends shall be properly interlocked with the picks to ensure that there
shall be no raveling of the tape edges. The tape shall have an average
weight of 196.7 plus or minus 10 percent grams per square meter 5.8 plus or
minus 10 percent ounces per square yard. An average thickness of 0.1778
plus or minus 0.0254 mm 0.007 plus or minus 0.001 inches. Warp ends/wales
of 17 plus or minus 1 per centimeter 42 plus or minus 2 per inch or filling
picks/courses of 13 plus or minus 1 per centimeter 32 plus or minus 2 per
inch, a minimum breaking strength of 2679 grams per mm 150 pounds per inch
of width, and after heating to 482 degrees C 900 degrees F for 2 hours. A
minimum breaking strength of 714 grams per mm 40 pounds per inch of width.
2.11.10
Knitted, Untreated
The wales shall be properly interlocked with the courses to ensure that
there shall be no raveling of the tape edges. The tape shall have an
average weight of 153 plus or minus 10 percent grams per square meter 4.5
plus or minus 10 percent ounces per square yard. An average thickness of
0.1778 plus or minus 0.0254 mm 0.007 plus or minus 0.001 inches, warp
ends/wales of 6 plus or minus per 1 centimeter 16 plus or minus 2 per inch.
A minimum breaking strength of 714 grams per mm 40 pounds per inch of
width and, after heating to 482 degrees C 900 degrees F for 2 hours. A
minimum breaking strength of 375 grams per mm 21 pounds per inch of width.
2.11.11
Distortion Requirements
There shall be no distortion of the tape when a sample 610 mm 24 inches in
length is spread across a flat horizontal surface and observed for evidence
of distortion (such as tendency to curl rather than lie flat). The width
SECTION 02560
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