with silver solder. Joints for flared-type fittings shall be provided on
all branch connections, mains, and risers to provide for expansion and
contraction of the pipe without stress to fittings, pipe, or tubing.
3.1.1.5
Copper Tube Extracted Joint
An extracted mechanical tee joint may be used in copper tube. Joint shall
be produced with an appropriate tool by drilling a pilot hole and drawing
out the tube surface to form a collar having a minimum height of three
times the thickness of the tube wall. To prevent the branch tube from
being inserted beyond the depth of the extracted joint, dimpled depth stops
shall be provided. The branch tube shall be notched for proper penetration
into fitting to ensure a free flow joint. Joints shall be brazed in
accordance with the NAPHCC NSPC. Soldered joints will not be permitted.
3.1.1.6
Grooved Mechanical Joints
Grooves shall be prepared according to the coupling manufacturer's
instructions. Grooved fittings, couplings, and grooving tools shall be
products of the same manufacturer. Pipe and groove dimensions shall comply
with the tolerances specified by the coupling manufacturer. The diameter
of grooves made in the field shall be measured using a "go/no-go" gauge,
vernier or dial caliper, narrow-land micrometer, or other method
specifically approved by the coupling manufacturer for the intended
application. Groove width and dimension of groove from end of pipe shall
be measured and recorded for each change in grooving tool setup to verify
compliance with coupling manufacturer's tolerances. Grooved joints shall
not be used in concealed locations.
3.1.2
Connections to Equipment
Supply and return connections shall be provided by the Contractor unless
otherwise indicated. Valves and traps shall be installed in accordance
with the manufacturer's recommendations. Unless otherwise indicated, the
size of the supply and return pipes to each piece of equipment shall not be
smaller than the equipment connections. Steam and return connections,
unless otherwise indicated, shall be made with malleable iron unions for
piping 65 mm 2-1/2 inches or less in diameter and with flanges for pipe 80
mm 3 inches or more, in diameter.
3.1.3
Branch Connections
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NOTE: Indicate on the drawings the direction of
piping pitch, details of branch take-offs from
mains, and pipe size reductions.
**************************************************************************
Branches shall pitch up or down as indicated, unless otherwise specified.
Connection shall be made to ensure unrestricted circulation; eliminate air
pockets; and permit drainage of the system. Steam supply and condensate
branches taken from mains shall pitch with a grade of not less than 25 mm
in 3 m 1 inch in 10 feet, unless otherwise indicated.
3.1.4
Risers
The location of risers is approximate. Exact locations of the risers shall
be as approved. Steam supply downfeed risers shall terminate in a dirt
pocket and shall be drip trapped to the return.
SECTION 15562A
Page 31
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