references to threaded connections for high
temperature water systems.
If expansion joints are required, coordinate this
paragraph with paragraph EXPANSION JOINTS in PART 2.
For Guided Slip Tube expansion joints the end
connections will be flanged or beveled for welding
as indicated. Joint shall be provided with an
anchor base where required or indicated. Where
adjoining pipe is carbon steel, the sliding slip
shall be seamless steel plated with a minimum of
0.051 mm (2 mils) of hard chrome in accordance with
ASTM B 650. All joint components shall be
fabricated from material equal to that of the
pipeline. Initial setting shall be made in
accordance with the manufacturer's recommendations
to compensate for ambient temperature at time of
installation. Pipe alignment guides shall be
installed as recommended by the joint manufacturer,
but in any case shall not be more than 1.5 m (5
feet) from expansion joint except that in lines 100
mm (4 inches) or smaller, guides will be installed
not more than 600 mm (2 feet) from the joint.
Service outlets will be provided where indicated.
Flexible ball joints will be constructed of alloys
as appropriate for the service intended. Joint ends
will be threaded (to 50.8 mm (2 inches) only),
grooved, flanged or beveled for welding as indicated
or required, and must be capable of absorbing a
minimum of 15-degree angular flex and 360-degree
rotation.
For Bellows-Type joints, guiding of piping on both
sides of expansion joint will be in accordance with
the published recommendations of the manufacturer of
the expansion joint. When a joint is installed
within four pipe diameters of an anchor, only one
side needs guiding.
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All piping in valve manholes shall be steel and insulated. Insulation
shall be protected with [an aluminum] [galvanized steel] jacket [, except
for chilled water lines where indicated not to be insulated.] Pipe shall
be accurately cut to measurements established at the site and shall be
worked into place without springing or forcing. Pipe and insulation shall
clear all openings and equipment. Excessive cutting or other weakening of
structural members to facilitate piping installation will not be permitted.
Burrs shall be removed from ends of pipe by reaming. Installation shall
permit free expansion and contraction without damage to joints or hangers.
Piping shall be installed in accordance with ASME B31.1. Joints for piping
in valve manholes shall be welded [, except joints at traps, strainers, and
at valves and piping 20 mm 3/4 inch and smaller which may be threaded].
[Flanged joints will be permitted for dielectric isolation only.]
Supports, anchors, or stays shall not be attached where either expansion or
the weight of the pipe will cause damage to permanent construction. The
method of attaching supports shall not interfere with the operation of the
cathodic protection system.
SECTION 02560
Page 25
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