2.19.11.5
Type 20
Type 20 attachments used on angles and channels shall be furnished with an
added malleable-iron heel plate or adapter.
2.19.11.6
Type 24
Type 24 may be used only on trapeze hanger systems or on fabricated frames.
2.19.11.7
Type 39 Saddle or Type 40 Shield
Where Type 39 saddle or Type 40 shield is permitted for a particular pipe
attachment application, the Type 39 saddle shall be used on all pipe 100 mm
4 inches and larger.
2.19.11.8
Horizontal Pipe Supports
Horizontal pipe supports shall be spaced as specified in MSS SP-69 and a
support shall be installed not over 300 mm 1 foot from the pipe fitting
joint at each changes in direction of the piping. Pipe supports shall be
spaced not over 1.5 m 5 feet apart at valves. In the support of multiple
pipe runs on a common base member, a clip or clamp shall be used where each
pipe crosses the base support member. Spacing of the base support members
shall not exceed the hanger and support spacing required for any of the
individual pipes in the multiple pipe run. The clips or clamps shall be
rigidly connected to the common base member. A clearance of 3 mm 1/8 inch
shall be provided between the pipe and clip or clamp for all piping which
may be subjected to thermal expansion.
2.19.11.9
Vertical Pipe Supports
Vertical pipe shall be supported at each floor, except at slab-on-grade,
and at intervals of not more than 4.5 m 15 feet not more than 2.4 m 8 feet
from end of risers, and at vent terminations.
2.19.11.10
Type 35 Guides with Slides
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.
a.
Where steel slides do not require provisions for restraint of
lateral movement, an alternate guide method may be used. On
piping 100 mm 4 inches and larger, a Type 39 saddle may be welded
to the pipe and freely rest on a steel plate. On piping under 100
mm 4 inches, a Type 40 protection shield may be attached to the
pipe or insulation and freely rest on a steel slide plate.
b.
Where there are high system temperatures and welding to piping is
not desirable, then the Type 35 guide shall include a pipe cradle,
welded to the guide structure and strapped securely to the pipe.
The pipe shall be separated from the slide material by at least
100 mm 4 inches, or by an amount adequate for the insulation,
whichever is greater.
SECTION 15555A
Page 65
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