3.4.5
Upright Sprinklers
Riser nipples or "sprigs" to upright sprinklers shall contain no fittings
between the branch line tee and the reducing coupling at the sprinkler.
Riser nipples exceeding 750 mm 30 inches in length shall be individually
supported.
3.4.6
Pipe Joints
Pipe joints shall conform to NFPA 13, except as modified herein. Not more
than four threads shall show after joint is made up. Welded joints will be
permitted, only if welding operations are performed as required by NFPA 13
at the Contractor's fabrication shop, not at the project construction site.
Flanged joints shall be provided where indicated or required by NFPA 13.
Grooved pipe and fittings shall be prepared in accordance with the
manufacturer's latest published specification according to pipe material,
wall thickness and size. Grooved couplings, fittings and grooving tools
shall be products of the same manufacturer. For copper tubing, 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, such
as behind solid walls or ceilings, unless an access panel is shown on the
drawings for servicing or adjusting the joint.
3.4.7
Reducers
Reductions in pipe sizes shall be made with one-piece tapered reducing
fittings. The use of grooved-end or rubber-gasketed reducing couplings
will not be permitted. When standard fittings of the required size are not
manufactured, single bushings of the face type will be permitted. Where
used, face bushings shall be installed with the outer face flush with the
face of the fitting opening being reduced. Bushings shall not be used in
elbow fittings, in more than one outlet of a tee, in more than two outlets
of a cross, or where the reduction in size is less than 15 mm (1/2 inch.
3.4.8
Pipe Penetrations
Cutting structural members for passage of pipes or for pipe-hanger
fastenings will not be permitted. Pipes that must penetrate concrete or
masonry walls or concrete floors shall be core-drilled and provided with
pipe sleeves. Each sleeve shall be Schedule 40 galvanized steel, ductile
iron or cast iron pipe and shall extend through its respective wall or
floor and be cut flush with each wall surface. Sleeves shall provide
required clearance between the pipe and the sleeve per NFPA 13. The space
between the sleeve and the pipe shall be firmly packed with mineral wool
insulation. Where pipes penetrate fire walls, fire partitions, or floors,
pipes shall be fire stopped in accordance with Section 07840 FIRESTOPPING.
In penetrations that are not fire-rated or not a floor penetration, the
space between the sleeve and the pipe shall be sealed at both ends with
plastic waterproof cement that will dry to a firm but pliable mass or with
a mechanically adjustable segmented elastomer seal.
SECTION 13930A
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