heavy steel collars with lugs and bolts for clamping and attaching anchor
braces, unless otherwise indicated. Anchor braces shall be installed using
turnbuckles where required. Supports, anchors, or stays shall be located
to prevent damage by installation operations or by the weight or expansion
of the pipeline.
3.1.8
Pipe Expansion
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NOTE: Steam piping layout should be analyzed for
thermal stresses due to expansion. Spring hangers
shall be indicated on drawing and used to absorb
vertical expansion of piping and seismic conditions.
Whenever possible, provisions for the expansion of
piping will be made by offsets or changes in the
direction of the run of pipe or by expansion loops.
Expansion joints will be permitted where
restrictions of space prevent use of expansion loops
or piping offsets. Expansion joints, when used,
shall be installed in readily accessible locations.
Drawings shall detail anchors, pipe guide offsets,
and expansion joints. Drawings shall also indicate
location.
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The expansion of supply and return pipes shall be provided for by changes
in the direction of the run of pipe, by expansion loops, or by expansion
joints as indicated. Condensate and steam expansion joints shall be one of
the types specified.
3.1.8.1
Expansion Loops
Expansion loops shall provide adequate expansion of the main straight runs
of the system within the stress limits specified in ASME B31.1. Loops
shall be cold-sprung and installed where indicated. Pipe guides shall be
provided as indicated.
3.1.8.2
Slip-Tube Type Expansion Joints
Slip-tube type expansion joints shall be used for steam and condensate
systems only and shall be installed where indicated. Joints shall provide
for either single or double slip of the connected pipes and temperature and
pressure suitable for application, in no case less than [_____] kPa psig.
Joints shall be in accordance with applicable requirements of EJMA Stds and
ASME B31.1, Type I or III. End connections shall be flanged. Anchor bases
or support bases shall be provided as indicated or required. Initial
setting shall be made in accordance with the manufacturer's recommendations
to allow for ambient temperature at time of installation. Pipe alignment
guides shall be installed as recommended by the joint manufacturer, but
shall be not more than 1.5 m 5 feet from expansion joint, except in lines
100 mm 4 inches or smaller where guides shall be installed not more than
600 mm 2 feet from the joint.
3.1.8.3
Bellows-Type Joint
Bellows-type joint design and installation shall comply with EJMA Stds.
The joints shall be designed for the working temperature and pressure
suitable for the application and shall be not less than 1.03 MPa 150 psig
SECTION 15562A
Page 36
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