2.11.14
Dielectric Waterways and Flanges
Dielectric waterways shall have temperature and pressure rating equal to or
greater than that specified for the connecting piping. Waterways shall
have metal connections on both ends suited to match connecting piping.
Dielectric waterways shall be internally lined with an insulator
specifically designed to prevent current flow between dissimilar metals.
Dielectric flanges shall meet the performance requirements described herein
for dielectric waterways.
2.11.15
Flexible Pipe Connectors
Flexible pipe connectors shall be designed for 861.8 kPa 125 psi or 1034.2
kPa 150 psi service. Connectors shall be installed where indicated. The
flexible section shall be constructed of rubber, tetrafluoroethylene resin,
or corrosion-resisting steel, bronze, monel, or galvanized steel.
Materials used and the configuration shall be suitable for the pressure,
vacuum, and temperature medium. The flexible section shall be suitable for
service intended and may have threaded, welded, soldered, flanged, or
socket ends. Flanged assemblies shall be equipped with limit bolts to
restrict maximum travel to the manufacturer's standard limits. Unless
otherwise indicated, the length of the flexible connectors shall be as
recommended by the manufacturer for the service intended. Internal sleeves
or liners, compatible with circulating medium, shall be provided when
recommended by the manufacturer. Covers to protect the bellows shall be
provided where indicated.
2.11.16
Pipe supports shall conform to MSS SP-58 and MSS SP-69.
2.11.17
Pipe Expansion
2.11.17.1
Expansion Loops
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NOTE: Whenever possible, expansion loops, offsets,
and bends shall be utilized instead of expansion
joints to absorb and to compensate for expansion and
contraction. Coordination will be made with seismic
bracing. Seismic bracing should not interfere with
thermal expansion.
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Expansion loops and offsets shall provide adequate expansion of the main
straight runs of the system within the stress limits specified in ASME B31.1.
The loops and offsets shall be cold-sprung and installed where indicated.
Pipe guides and anchors shall be provided as indicated.
2.11.17.2
Expansion Joints
Expansion joints shall provide for either single or double slip of the
connected pipes, as required or indicated, and for not less than the
transverse indicated. The joints shall be designed for a [hot water]
[steam] working pressure not less than [_____] kPa psig and shall be in
accordance with applicable requirements of EJMA Stds and ASME B31.1. End
connection shall be flanged. Anchor bases or support bases shall be
provided as indicated or required. Sliding surfaces and water wetted
SECTION 15569A
Page 48
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