produce a straight, smooth edge. Lap longitudinal and circumferential
seams not less than 50 mm 2 inches. Install jackets on horizontal piping
with the longitudinal seam approximately midway between horizontal
centerline and the bottom side of pipe. Install with the top edge of
jacket overlapping the bottom edge of jacket and with the seam of each
jacket offset from the seam of the adjacent jacket. Install jackets on
vertical piping and on piping pitched from the horizontal from low point to
high point so that the lower circumferential edge of each jacket overlaps
the jacket below it. Provide factory prefabricated covers for insulation
on fittings, valves, and flanges. Finish jackets neatly at pipe hangers
and pipe supports. Terminate jackets neatly at the ends of unions, valves,
traps, and strainers. Secure jacket with stainless steel bands spaced not
more than 200 mm 8 inches on center.
3.3.1
Additional Requirements for Insulated Piping Under Piers
Provide one layer of asphalt-saturated felt over the insulation prior to
installing stainless steel jacket.
3.3.2
Under Pier Stainless Steel Jacket
In addition to the above requirements for aluminum jackets, secure
longitudinal and circumferential seams with stainless steel screws spaced
not more than 100 mm 4 inches on centers. At approximately every 6 linear
meter 20 linear feet of piping, lap the circumferential seams not less than
150 mm 6 inches; omit the screws.
3.4
ASPHALT-SATURATED FELT
Apply felt with longitudinal and circumferential seams lapped not less than
150 mm 6 inches. Secure with not less than 13 mm 0.5 inch width stainless
steel bands spaced not more than 200 mm 8 inches on center.
-- End of Section --
SECTION 15081N
Page 10
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