grease and other foreign material and shall be installed to permit free
expansion and contraction without damaging the building structure, pipe,
pipe joints, or pipe supports. Changes in direction shall be made with
fittings, except that bending of pipe 100 mm 4 inches and smaller will be
permitted provided a pipe bender is used and wide sweep bends are formed.
The centerline radius of bends shall not be less than 6 diameters of the
pipe. Bent pipe showing kinks, wrinkles, flattening, or other
malformations will not be accepted. Vent pipes shall be carried through
the roof as directed and shall be properly flashed. Unless otherwise
indicated, horizontal supply mains shall pitch down in the direction of
flow with a grade of not less than 0.2 percent1 inch in 40 feet. Open ends
of pipelines and equipment shall be properly capped or plugged during
installation to keep dirt or other foreign materials out of the systems.
Pipe not otherwise specified shall be uncoated. Unless otherwise specified
or shown, final connections to equipment shall be made with malleable-iron
unions for steel pipe 65 mm 2-1/2 inches or less in diameter and with
flanges for pipe 80 mm 3 inches or more in diameter. Unions for copper
pipe or tubing shall be brass or bronze. Reducing fittings shall be used
for changes in pipe sizes. In horizontal hot water lines, reducing
fittings shall be eccentric type to maintain the top of the lines at the
same level to prevent air binding.
3.2.1
Hot Water Piping and Fittings
Pipe shall be black steel or copper tubing. Fittings for steel piping
shall be black malleable iron or cast iron to suit piping. Fittings
adjacent to valves shall suit valve material. Grooved mechanical fittings
will not be allowed for water temperatures above 110 degrees C 230 degrees F.
3.2.2
Vent Piping and Fittings
Vent piping shall be black steel.
Fittings shall be black malleable iron
or cast iron to suit piping.
3.2.3
Gauge Piping
Piping shall be copper tubing.
3.2.4
Steam Piping and Fittings
Piping shall be black steel. Fittings shall be black, malleable iron, cast
iron or steel. Fittings adjacent to valves shall suit valves specified.
Grooved mechanical fittings will not be allowed for steam piping.
3.2.5
Condensate Return Pipe and Fittings
Piping shall be black steel. Fittings shall be malleable iron, cast iron,
or steel. Grooved mechanical fittings will not be allowed for condensate
piping.
3.2.6
Joints
Joints between sections of steel pipe and between steel pipe and fittings
shall be threaded, grooved, flanged or welded as indicated or specified.
Except as otherwise specified, fittings 25 mm 1 inch and smaller shall be
threaded; fittings 32 mm 1-1/4 inches and up to but not including 80 mm 3
inches shall be either threaded, grooved, or welded; and fittings 80 mm 3
inches and larger shall be either flanged, grooved, or welded. Pipe and
fittings 32 mm 1-1/4 inches and larger installed in inaccessible conduit or
SECTION 15569A
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