and durable cast steel [or gray cast-iron]. The bodies shall have arrows
clearly cast on the sides to indicate the direction of flow. Each strainer
shall be equipped with an easily removable cover and sediment basket. The
basket shall be not less than 0.63 mm 0.025 inch thick corrosion-resistant
steel [or sheet brass] with enough small perforations to provide a net free
area through the basket of at least 3.30 times that of the diameter of the
entering pipe.
2.26.10
Pipe Hangers, Inserts, and Supports
Pipe hangers, inserts and supports shall conform to MSS SP-58 and MSS SP-69,
except as modified herein:
a.
Types 5, 12, and 32 shall not be used.
b.
Type 3 shall not be used on insulated pipe which has a vapor
barrier. Type 3 may be used on insulated pipe that does not have
a vapor barrier if clamped directly to the pipe and if the clamp
bottom does not extend through the insulation and the top clamp
attachment does not contact the insulation during pipe movement.
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 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.
e.
Type 20 attachments used on angles and channels shall be furnished
with an added malleable-iron heel plate or adaptor.
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 all pipe 100 mm 4 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 polytetrafluoroethylene
SECTION 15559A
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