Use and Care Guide

37
INSTALLATION PROCEDURES
FOR CAST IRON
Note: Charlotte Pipe does not recommend or warrant
installations joined with un-shielded hubless couplings.
• Charlotte Pipe strongly recommends that its cast
iron pipe and fittings be joined with shielded hubless
couplings manufactured in accordance with CISPI
310, ASTM C 1277 or ASTM C 1540 and certified
by NSF
®
International.
• Failures in installations using couplings not
recommended by Charlotte Pipe or not conforming
to CISPI 310, ASTM C 1277 or ASTM C 1540
are not the responsibility of the company. For
more information please see our Limited Warranty
in this manual, call 800-438-6091 or visit
www.charlottepipe.com.
UNDERGROUND INSTALLATION
PROCEDURES
The physical properties of cast iron soil pipe and fittings
make cast iron an ideal drain, waste, and vent material
for underground installations. Two key elements for
proper underground installations are trench preparation
and backfilling.
The trench should be wide enough for easy assembly of
the joints. Total load on the pipe includes both earth load
and live load. Safety procedures including OSHA and
other laws applicable to trenching should be observed,
including provisions to avoid collapse of the trench wall.
Cast iron, being a rigid material, does not depend upon
sidefill for support. The trench bottom should be stable
enough to support the complete barrel of the pipe. If
possible, the barrel of the pipe should rest on even and
undisturbed soil. Holes should be provided at each joint
for each hub or coupling to allow for continuous support
of the barrel along the trench bottom. If the ditch must
be excavated deeper than the depth of the drainage pipe,
place and tamp backfill material to provide uniform
support for the pipe barrel.
Many times in the installation of underground cast iron,
it is necessary to make adjustments to the direction of the
drain line. Cast iron soil pipe and neoprene compression
gaskets will allow this through deflection in the joints.
Installation should initially be completed in a straight
line and then deflected to the appropriate amount.
Maximum deflection should not exceed
1
/
2
inch per foot
of pipe. This would allow 5 inches of deflection for a 10
foot piece of pipe. For changes in direction greater than
these deflections, an appropriate fitting should be used.
• Forsizes1-1/2”through4”(coupling
has two bands): Take the slack out of
the clamp alternately and firmly, then
tighten in the same sequence with a
preset torque wrench.
• Forsizes5”,6”,8”and10”(coupling
has four bands): First, take the
slack out of the two inside clamps
alternately and firmly, then repeat
the process on the two outside clamps;
finally tighten in the same sequence
with a preset torque wrench.
• Forsizes12”and15”(couplinghas
six bands): First, take the slack out of
the two inside bands alternately and
firmly, then continue to the middle
two bands and repeat the process;
then repeat the process with the two
outside bands; finally tighten in the
same sequence with a preset torque
wrench.
• Heavy Duty Couplings: For sizes
1-1/2” through 4” (coupling has four
bands): First, take the slack out of
the second band, then the first band,
the third band followed up by the
fourth band. Finally, tighten in the
same sequence with a preset torque
wrench.
For sizes 5” through 15” (coupling
has six bands): First, take the slack
out of the third band followed by
the second. Then, the first and third,
followed by the second and first;
then, the fourth and fifth. After, the
fifth the sixth and fourth should be
done followed by the fifth and sixth.
The third, second, first, fourth, fifth
and finally sixth. It may be more simple to state it
as follows: 3,2,1-3,2,1-4,5,6-4,5,6-3,2,1,4,5,6.