e.
Joints made with sleeve-type mechanical couplings: 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 provide for confinement and compression of the
gaskets. Middle ring shall be of cast-iron [or steel], and the
follower rings shall be of malleable iron or ductile iron. Cast
iron shall conform to ASTM A 48/A 48M and shall be not less than
Class 25. Malleable iron shall conform to ASTM A 47/A 47M.
Ductile iron shall conform to ASTM A 536. [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 be either of the following: bolts
conforming to the tensile requirements of ASTM A 307, Grade A,
with nuts conforming to the tensile requirements of ASTM A 563M
ASTM A 563, Grade A; or round-head square-neck type bolts
conforming to ASME 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.
f.
[Grooved] [and] [Shouldered] Type Joints: [Grooved pipe ends]
[Shouldered pipe ends] and couplings shall conform to AWWA C606.
Joint dimensions shall be as specified in AWWA C606 for rigid
joints.
2.1.7
ABS Composite Plastic Piping
2.1.7.1
ABS Composite Plastic Pipe and Fittings
ASTM D 2680.
2.1.7.2
Jointing Materials for ABS Composite Plastic Piping
Solvent cement and primer shall conform to ASTM D 2680.
2.1.8
ABS Solid-Wall Plastic Piping
2.1.8.1
ABS Solid-Wall Plastic Pipe and Fittings
ASTM D 2751, SDR 35, with ends suitable for either solvent cement joints or
elastomer joints.
2.1.8.2
ABS Solid-Wall Plastic Joints and Jointing Materials
Solvent cement for solvent cement joints shall conform to ASTM D 2235.
SECTION 02531
Page 22
Previous Page
