SD-07 Certificates
Flexible Ball Joints.
Flexible ball joints shall be certified to be suitable for the
service intended by the manufacturer. Information verifying
experience at not less than 3 locations of 2 years' satisfactory
operation in a similar application shall be submitted.
PART 2
PRODUCTS
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NOTE: Appropriate materials for structural supports
must be used in corrosive environments. Dissimilar
metals must be isolated.
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2.1
FLEXIBLE COUPLINGS
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NOTE: Designer should include reference to other
specification sections containing provisions for
pipe pressure and temperature ratings, if deemed
necessary.
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Flexible couplings shall have same pressure and temperature ratings as
adjoining pipe.
2.2
FLEXIBLE BALL JOINTS
Flexible ball joints shall have cast or wrought steel casing and ball parts
capable of 360-degree rotation with not less than 15-degree angular
movement.
2.3
FLEXIBLE MECHANICAL JOINTS
a.
Mechanical couplings for steel or cast iron pipe shall be of the
sleeve type and shall provide a tight flexible joint under all
reasonable conditions, such as pipe movement caused by expansion,
contraction, slight settling or shifting of the ground, minor
variations in trench gradients, and traffic vibrations. Where
permitted in other sections of these specifications, joints
utilizing split-half couplings with grooved or shouldered pipe
ends may be used.
b.
Sleeve-type couplings shall be used for joining plain-end pipe
sections. The coupling shall consist of one steel middle ring,
two steel followers, two gaskets, and necessary steel bolts and
nuts to compress the gaskets.
2.4
MANUFACTURED BALL JOINTS
Manufactured ball joints shall be as recommended by the manufacturer for
the intended use, and shall be approved by the Contracting Officer before
installation.
SECTION 15070A
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