used.
3.1.7.1
Hangers
Type 3 shall not be used on insulated piping. Type 24 may be used only on
trapeze hanger systems or on fabricated frames.
3.1.7.2
Inserts
Type 18 inserts shall be secured to concrete forms before concrete is
placed. Continuous inserts which allow more adjustments may be used if
they otherwise meet the requirements for Type 18 inserts.
3.1.7.3
C-Clamps
Type 19 and 23 C-clamps shall be torqued per MSS SP-69 and have both
locknuts and retaining devices, furnished by the manufacturer.
Field-fabricated C-clamp bodies or retaining devices are not acceptable.
3.1.7.4
Angle Attachments
Type 20 attachments used on angles and channels shall be furnished with an
added malleable-iron heel plate or adapter.
3.1.7.5
Saddles and Shields
Where Type 39 saddle or Type 40 shield are permitted for a particular pipe
attachment application, the Type 39 saddle, connected to the pipe, shall be
used on all pipe 100 mm 4 inches and larger when the temperature of the
medium is 16 degrees C 60 degrees F or higher. Type 40 shields shall be
used on all piping less than 100 mm 4 inches and all piping 100 mm 4 inches
and larger carrying medium less than 16 degrees C 60 degrees F. A high
density insulation insert of cellular glass shall be used under the Type 40
shield for piping 50 mm 2 inches and larger.
3.1.7.6
Horizontal Pipe Supports
Horizontal pipe supports shall be spaced as specified in MSS SP-69. A
support shall be installed not over 300 mm 12 inches from the pipe fitting
joint at each change in direction of the piping. Pipe supports shall be
spaced not over 1525 mm 5 feet apart at valves. Pipe hanger loads
suspended from steel joist with hanger loads between panel points in excess
of 23 kg 50 pounds shall have the excess hanger loads suspended from panel
points.
3.1.7.7
Vertical Pipe Supports
Vertical pipe shall be supported at each floor, except at slab-on-grade,
and at intervals of not more than 4570 mm 15 feet, not more than 2440 mm 8
feet from end of risers, and at vent terminations.
3.1.7.8
Pipe Guides
Type 35 guides using steel, reinforced polytetrafluoroethylene (PTFE) or
graphite slides shall be provided where required to allow longitudinal pipe
movement. Lateral restraints shall be provided as required. Slide
materials shall be suitable for the system operating temperatures,
atmospheric conditions, and bearing loads encountered.
SECTION 15652A
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