Piping and attached valves shall be supported and braced to resist seismic
loads as specified in Sections 13080 SEISMIC PROTECTION FOR MISCELLANEOUS
EQUIPMENT and 15070A SEISMIC PROTECTION FOR MECHANICAL EQUIPMENT [as shown
on the drawings].
3.5
PIPE JOINTS
Pipe joints shall be designed and installed to effectively sustain the
longitudinal pull-out forces caused by contraction of the piping or
superimposed loads.
3.5.1
Threaded Metallic Joints
Threaded joints in metallic pipe shall have tapered threads evenly cut and
shall be made with UL approved graphite joint sealing compound for gas
service or tetrafluoroethylene tape applied to the male threads only.
Threaded joints up to 40 mm 1-1/2 inches in diameter may be made with
approved tetrafluoroethylene tape. Threaded joints up to 50 mm 2 inches in
diameter may be made with approved joint sealing compound. After cutting
and before threading, pipe shall be reamed and burrs shall be removed.
Caulking of threaded joints to stop or prevent leaks shall not be permitted.
3.5.2
Welded Metallic Joints
Beveling, alignment, heat treatment, and inspection of welds shall conform
to ASME B31.2. Weld defects shall be removed and repairs made to the weld,
or the weld joints shall be entirely removed and rewelded. After filler
metal has been removed from its original package, it shall be protected or
stored so that its characteristics or welding properties are not affected
adversely. Electrodes that have been wetted or have lost any of their
coating shall not be used.
3.5.3
Thermoplastic and Fiberglass Joints
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NOTE: Thermoplastic and fiberglass pipe should not
be installed where temperature will be below minus
29 degrees C (20 degrees F) or above 38 degrees C
(100 degrees F). Fiberglass pipe may be used at
temperatures up to 66 degrees C (150 degrees F),
providing the pipe is marked in accordance with ASTM
D 2513.
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Jointing procedures shall conform to AGA XR0104. Solvent cement or heat of
fusion joints shall not be made between different kinds of plastics.
3.5.4
Flared Metallic Tubing Joints
Flared joints in metallic tubing shall be made with special tools
recommended by the tubing manufacturer. Flared joints shall be used only
in systems constructed from nonferrous pipe and tubing, when experience or
tests have demonstrated that the joint is suitable for the conditions, and
when adequate provisions are made in the design to prevent separation of
the joints. Metallic ball sleeve compression-type tubing fittings shall
not be used for tubing joints.
SECTION 15190A
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