mounted] [recessed] [[single] [double] projector,] [grill and] vibrating
type suitable for use in an electrically supervised circuit. Horns shall
operate on nominal 24 VDC and have screw terminals for in-out wiring
connection. Sound output shall be a minimum of [85] [_____] DBA at 3 m 10
feet. Horns used in exterior locations shall be specifically listed or
approved for outdoor use and be provided with metal housing and protective
grills.
PART 3
EXECUTION
3.1
INSTALLATION
3.1.1
Aboveground Piping
Piping shall be installed straight and bear evenly on hangers and supports.
Preaction sprinkler system piping shall be pitched as if it were being
installed in areas subject to freezing. Piping shall be concealed in areas
with suspended ceiling and shall be inspected, tested and approved before
being concealed.
3.1.1.1
Joints
Pipe joints shall conform to NFPA 13. Not more than four threads shall
show after joint is made up. Joint compound shall be applied to male
threads only. Joints shall be faced true, provided with gaskets and made
square and tight. Flanged joints or mechanical groove couplings 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
installation instructions. All 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.
3.1.1.2
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 13 mm 1/2 inch.
3.1.1.3
Sprinkler Riser Nipples (Sprigs)
Riser nipples (sprigs) 25 mm 1 inch in size between sprinkler branch lines
and individual sprinklers shall not be used unless necessitated by roof or
ceiling conditions. In such cases, fittings shall not be installed between
the branch line tee and the reducing coupling below the sprinkler.
3.1.1.4
Sprinkler Deflectors
Sprinkler deflectors shall be installed parallel to the roof or ceiling.
Deflector distances from the underside of the roof or ceiling shall be in
accordance with NFPA 13 except that in no case shall distance exceed 300 mm
12 inches. Sprinkler clearances from obstructions shall be in accordance
with NFPA 13.
SECTION 13955A
Page 28
Previous Page
