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e.
Shear Gates: Shear gates shall be flange frame type suitable for
bolting to flanged pipe or to partition wall [or for setting in
concrete wall]. Frame and disc or cover shall be of cast iron
with bronze seating rings in both frame and disc. Hinge pin shall
be bronze. Seating wedge(s) shall be integral with the frame or
bolted on. Contact surfaces between frame and disc or cover shall
be machine finished. Operation shall be by means of lifting
handle with positioning points. Lifting handle shall be of such
length as to be accessible from the walkway.
f.
Hose Bibb: Hose bibb shall be of all-brass construction and shall
have 19 mm 3/4 inch hose thread.
2.11.2.4
Flexible Sleeve-Type Mechanical Couplings
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NOTE: Minimum number of bolts for each pipe size
should be as follows: 75 mm 3 inch, 3; 100 mm 4 inch,
4; 150 mm 6 inch, 5; 200 mm 8 inch.
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Couplings shall be provided in flanged piping where necessary to facilitate
removal of piping sections or for other use as necessary for manufacturer's
design. Couplings shall be designed to couple plain-end piping by
compression of a ring gasket at each end of the adjoining pipe sections.
The coupling shall consist of one middle ring flared or beveled at each end
to provide a gasket seat; two follower rings; two resilient tapered rubber
gaskets; and bolts and nuts to draw the follower rings toward each other to
compress the gaskets. The middle ring and the follower rings shall be true
circular sections free from irregularities, flat spots, and surface
defects; the design shall be such as to provide for confinement and
compression of the gaskets. Middle ring shall be of steel and the follower
rings shall be of steel or malleable iron. Malleable iron shall conform to
ASTM A 47M ASTM A 47. Steel shall have a strength not less than that of
the pipe. Gaskets shall be designed for long life and resistance to set
after installation and shall meet the applicable requirements specified for
gaskets for mechanical joint in AWWA C111. Bolts shall be track-head type;
bolts and nuts shall conform to the tensile requirements of ASTM A 307,
Grade A; or bolts shall be round-head square-neck type conforming to ANSI
B18.5.2.1M and ASME B18.5.2.2M with hex nuts conforming to ASME B18.2.2.
Bolts shall be 16 mm 5/8 inch in diameter; minimum number of bolts for each
coupling shall be [[_____] for [_____] mm inch pipe [, [_____] for [_____]
mm inch pipe,] and [_____] for [_____] mm inch pipe]. Bolt holes in
follower rings shall be of a shape to hold fast the necks of the bolts
used. Sleeve-type mechanical couplings shall not be used as an optional
method of jointing except where pipeline is adequately anchored to resist
tension pull across the joint.
2.11.2.5
Hangers and Supports
Hangers and supports shall be of standard design where possible and shall
be adequate to maintain the supported load in proper position under all
operating conditions and shall be adjustable split ring type supported by
threaded rods hung from beam clamps. Hanger rods shall be
machine-threaded, and based on rod diameter. For pipe under 100 mm 4 inches,
the rods shall be not less than 13 mm 1/2 inch in diameter; for pipe 100 mm
4 inches and above, not less than 19 mm 3/4 inch in diameter. Pipe saddle
SECTION 11375N
Page 62
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