Use and Care Guide

39
INSTALLATION PROCEDURES
FOR CAST IRON
for support and stability during construction, secure
the piping in its proper position with metal stakes
and braces fastened to the pipe. Support the weight
of vertical pipe risers at the point or points above and
closest to their center of gravity.
Installing Horizontal Piping—Suspended
Horizontal pipe and fittings five (5) inches and larger
must be suitably restrained to prevent horizontal
movement and possible joint separation. This must be
done at every branch opening or change in direction
by the use of a brace, block, rodding or other suitable
method, to prevent movement or joint separation.
NOTE: Engineers, designers and
installers should use additional
references concerning hanging,
restraint and support of pipe in
the Cast Iron Soil Pipe Handbook
published by the Cast Iron Soil
Pipe Institute (www.cispi.org) and/or the ASPE Plumbing
Riser Clamp
Sway
Brace
1. Support horizontal piping and fittings at intervals
sufficiently close to maintain correct pipe alignment
and to prevent sagging or grade reversal. Support
each length of pipe with an approved hanger located
as close to the joint as possible, and not more than 18
inches from the joint. For 12” and 15” hubless pipe,
hangers should be placed on both sides of the coupling
when installing full ten-foot lengths. Installation
requiring multiple joints within a four foot developed
length shall be supported at every other or alternating
couplings.
2. Support terminal ends of all horizontal runs or
branches, and each change of direction or alignment,
with an approved hanger.
3. Firmly secure all closet bends installed above ground.
4. Most plumbing codes require that five-foot pipe be
supported at five-foot intervals, and that ten-foot
pipe be supported at ten-foot intervals. Support
each length of pipe properly in accordance with all
applicable codes to prevent sagging and misalignment.
5. When installing large-diameter horizontal piping
(five inches or larger), restrain joints to prevent
horizontal movement. Use sway bracing as needed
to stabilize side movement of the piping system. Use
blocks, rods, bracing or other suitable methods at
each branch opening or change in direction. Examples
of restraints are shown here:
Unsecured piping can fall and cause serious injury. Always
properly support and secure piping to help prevent injury.
Always wear protective clothing, including hard hats,
during installation.
Engineering Design Handbook, chapter 6, Hangers and
Support in Vol. 4, published by the American Society of
Plumbing Engineers (www.aspe.org).
Installing Horizontal Fittings
NOTE: The following procedures are intended only as
general guidelines. Specific installation instructions and
techniques may be required as a result of applicable
plumbing and building codes, engineering specifications
and instructions.
1. Use hangers as required to provide proper alignment
and grade. Install a hanger at every horizontal branch
connection. Always install hangers within 18 inches
of the joint to maintain correct system alignment
and to prevent structural sagging. For 12” and 15”
hubless pipe, hangers should be placed on both sides
of the coupling when installing full ten-foot lengths.
Installation requiring multiple joints within a four-
foot developed length shall be supported at alternating
couplings. The correct spacing of hangers will enable
proper piping system grade.
2. Use sway bracing, as needed, to stabilize hanging
systems against horizontal movement. Sway bracing
is a non-rigid form of structural support that is well
suited to installations in which components hang from
a height greater than 18 inches.
3. The following components should be stabilized from
movement in any direction: closet bends; traps; trap-
arms; all similar branches. Closet bends installed above
ground must be stabilized. Stabilize all vertical closet
stubs against all vertical and horizontal movement.
4. When a hubless blind plug is used for a required
cleanout, the complete coupling and plug must be
accessible for removal and replacement.
5. Use caulked lead and oakum or compression joints
to connect closet rings,
floor drains, shower drains,
similar slip-over fittings,
and hubless pipe
and fittings to soil
pipe hubs.