g.
Where type 39 saddle or type 40 shield are permitted for a
particular pipe attachment application, the type 39 saddle welded
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 a density 130 kg/cubic meter 8 pcf or greater
shall be used under the type 40 shield for piping 50 mm 2 inches
and larger.
h.
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 change 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.
i.
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.
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 carrying medium 16 degrees C 60
degrees F or higher, a type 39 saddle may be welded to the pipe
and freely rest on the steel plate. On piping under 100 mm 4
inches and piping 100 mm 4 inches and larger carrying medium less
than 16 degrees C 60 degrees F a type 40 protection shield may be
attached to the pipe or insulation and freely rest on a steel
plate. A high density insulation insert of density 130 kg/cubic
meter 8 pcf or greater shall be used under all shields on piping
50 mm 2 inches and larger.
(2) 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.
k.
Pipe hangers on horizontal insulated pipe shall be the size of the
outside diameter of the insulation. The insulation shall be
continuous through the hanger on all pipe sizes and applications.
SECTION 15562A
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