c.
Type 18 inserts shall be secured to concrete forms before concrete
is placed. Continuous inserts which allow more adjustment may be
used if they otherwise meet the requirements for type 18 inserts.
d.
Type 19 and 23 shall be torqued per MSS SP-69 and shall have both
locknuts and retaining devices furnished by the manufacturer. The
C-clamp body shall not be constructed from bent plate.
e.
Type 20 attachments used on angles and channels shall be furnished
with an added malleable iron heel plate or adapter.
f.
Type 24 may be used only on trapeze hanger systems or on
fabricated frames.
g.
Where type 39 saddle or type 40 shield is permitted for a
particular pipe attachment application, the type 39 saddle shall
be used on pipe 100 mm 4 inches and larger.
h.
Horizontal pipe supports shall be spaced as specified in the
tables in MSS SP-69 and a support shall be installed not over 300
m 1 foot from the pipe fitting joint at each change in direction
of the piping. Pipe support spacing shall be as required for
specified hydrostatic tests. Pipe supports shall be spaced not
over 1.5 meters 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 3.2 mm 1/8 inch shall
be provided between the pipe and clip or clamp for piping which
may be subjected to thermal expansion.
i.
Vertical pipe shall be supported at each floor, except at slab on
grade, and at intervals of not more than 4.5 meters 15 feet, nor
more than 2.4 meters 8 feet from ends of risers, and at vent
terminations.
j.
Type 35 guides using steel, reinforced 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.
(1) 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.
(2) Where there are high system temperatures and welding to
piping is not desirable, 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 15561A
Page 96
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