pendent type, unless otherwise indicated. Dry pendent sprinklers shall be
of the required length to permit the sprinkler to be threaded directly into
a branch line tee. Hangers shall be provided on arm-overs exceeding 300 mm
12 inches in length. Dry pendent sprinkler assemblies shall be such that
sprinkler ceiling plates or escutcheons are of the uniform depth throughout
the finished space. Pendent sprinklers in suspended ceilings shall be a
minimum of 150 mm 6 inches from ceiling grid. Recessed pendent sprinklers
shall be installed such that the distance from the sprinkler deflector to
the underside of the ceiling shall not exceed the manufacturer's listed
range and shall be of uniform depth throughout the finished area.
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
Pendent Sprinklers Locations
Sprinklers installed in the pendent position shall be of the listed dry
pendent type, unless otherwise indicated. Dry pendent sprinklers shall be
of the required length to permit the sprinkler to be threaded directly into
a branch line tee. Hangers shall be provided on arm-overs exceeding 300 mm
12 inches in length. Dry pendent sprinkler assemblies shall be such that
sprinkler ceiling plates or escutcheons are of the uniform depth throughout
the finished space. Pendent sprinklers in suspended ceilings shall be a
minimum of 150 mm 6 inches from ceiling grid. Recessed pendent sprinklers
shall be installed such that the distance from the sprinkler deflector to
the underside of the ceiling shall not exceed the manufacturer's listed
range and shall be of uniform depth throughout the finished area.
3.4.7
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 and fittings shall be from the
same manufacturer. 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.
3.4.8
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.
SECTION 13945A
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