greater. The annular space between the flashing sleeve and the bare pipe
or insulation surface shall be sealed as indicated. Pipes up to and
including 250 mm 10 inches in diameter passing through roof or floor
waterproofing membrane may be installed through a cast-iron sleeve with
caulking recess, anchor lugs, flashing clamp device, and pressure ring with
brass bolts. Waterproofing membrane shall be clamped into place and
sealant shall be placed in the caulking recess.
3.1.6.2
Optional Sealing of Uninsulated Pipes
A modular mechanical type sealing assembly may be installed. The seals
shall consist of interlocking synthetic rubber links shaped to continuously
fill the annular space between the pipe/conduit and sleeve with
corrosion-protected carbon steel bolts, nuts, and pressure plates. The
links shall be loosely assembled with bolts to form a continuous rubber
belt around the pipe with a pressure plate under each bolt head and each
nut. After the seal assembly is properly positioned in the sleeve,
tightening of the bolt shall cause the rubber sealing elements to expand
and provide a watertight seal between the pipe/conduit and the sleeve.
Each seal assembly shall be sized as recommended by the manufacturer to fit
the pipe/conduit and sleeve involved. The Contractor electing to use the
modular mechanical type seals shall provide sleeves of the proper diameters.
3.1.6.3
Optional Counterflashing
As an alternate to caulking and sealing the annular space between the
flashing sleeve and bare pipe or insulation surface, counterflashing may be
by standard roof coupling for threaded pipe up to 150 mm 6 inchesin
diameter; lead-flashing sleeve for dry vents, sleeve turned down into the
pipe to form a waterproof joint; or tack-welded or banded-metal rain shield
around the pipe, sealed as indicated.
3.1.6.4
Escutcheons
Escutcheons shall be provided at all finished surfaces where exposed
piping, bare or covered, passes through floors, walls, or ceilings, except
in boiler, utility, or equipment rooms. Escutcheons shall be fastened
securely to pipe sleeves or to extensions of sleeves without any part of
sleeves visible. Where sleeves project slightly from floors, special
deep-type escutcheons shall be used. Escutcheons shall be chromium-plated
iron or brass, either one-piece or split-pattern, held in place by internal
spring tension or setscrew.
3.1.6.5
Clay Sewer Pipe
Pipe shall be installed where indicated for housing steam-supply and
condensate-return lines. The sewer pipe shall be installed on properly
graded and well-tamped earth or gravel base. Joints shall be packed with
twisted-jute packing and sealed with bituminous sealing compound or
portland cement mortar.
3.1.7
Pipe Anchors
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NOTE: Detail and indicate location of pipe anchors.
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Anchors shall be provided where necessary or indicated to localize
expansion or prevent undue strain on piping. Anchors shall consist of
SECTION 15562A
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