been inspected, tested, and approved. Where pipe passes through building
structure, pipe joints shall not be concealed, but shall be located where
they may be readily inspected and building structure shall not be weakened.
Avoid interference with other piping, conduit, or equipment. Except
where specifically shown otherwise, vertical piping shall run plumb and
straight and parallel to walls. Piping connected to equipment shall be
installed to provide flexibility for vibration. Support and anchor piping
so that weight of the piping is not putting equipment under a load.
3.1.3.1
Fittings
Provide long radius elbows on welded piping to reduce pressure drops due to
bends in the piping runs. Do not miter pipe to form elbows or notch
straight runs to form full sized tees, or similar construction. Make
branch connections with welding tees or factory made forged welding branch
outlets and nozzles having integral reinforcements conforming to
ASME B31.1.
3.1.3.2
Grading of Pipe Lines
Unless indicated otherwise, install horizontal lines of steam and return
piping to grade down in the direction of flow with a pitch of not less than
25 mm in 9 meters one inch in 30 feet, except in loop mains and main
headers where flow may be either direction. Pitch air lines to the source
of supply, and make provisions for draining off condensate. Install water
lines to drain to a shutoff valve.
3.1.3.3
Anchoring, Guiding, and Supporting Piping
**************************************************************************
NOTE: Pipe hangers and supports shall be spaced and
designed to support steam piping filled with water
for hydrostatic tests.
**************************************************************************
Anchor and support piping in a manner such that expansion and contraction
will take place in the direction desired, prevent vibration by use of
vibration dampeners, and prevent undue strains on boilers and equipment
served. Fabricate hangers used for the support of piping of 50 mm 2 inch
nominal pipe size and larger to permit adequate adjustment after erection
while still supporting the load. Provide wall brackets where pipes are
adjacent to walls or other vertical surfaces which may be used for
supports. Provide supports to carry the weight of the lines and maintain
proper alignment. Provide inserts and sleeves for the supports in concrete
where necessary and place in new construction before pouring concrete.
Provide insulated piping with a pipe covering protection saddle at each
support. Provide pipe guides and anchors of approved type at points where
necessary to keep pipes in accurate alignment, to direct expansion
movement, and to prevent buckling and swaying and undue strain.
Provide
pipe guides for alignment of pipe connecting the free unanchored ends of
each expansion joint. Support pipe rollers in concrete conduits and
trenches by extra strong steel pipe with ends inserted in slots provided in
concrete walls. Set pipe supports for rollers at correct elevations either
by metal shims or by cutting away of concrete and after placing pipe lines
in alignment, grout ends of pipe supports and fix in place. Space pipe
supports to provide adequate support for pipes. Pipe shall not have
pockets formed in the span due to sagging of the pipe between supports,
caused by the weight of the pipe, medium in the pipe, insulation, valves,
and fittings. Maximum spacing for pipe supports for steel pipe shall be in
SECTION 15502N
Page 173
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