Use and Care Guide

38
Cast Iron Installation
While backfilling, use cradling and partial backfilling
of pipe to stabilize its position and maintain its correct
alignment. While pouring slabs, stabilize piping securely
to prevent any misalignment during the pour. Firmly
secure all closet bends installed under a slab.
Where unstable soil requires the drain and waste line
to be supported with hangers attached to the concrete
slab, sway bracing should always be a part of the support
system. Sway bracing will help keep the system in proper
alignment and help eliminate movement from side to side.
Once the underground installation is completed, the
section is ready for testing. Charlotte Pipe recommends
testing at 10 feet of hydrostatic (water) pressure (4.3
pounds per square inch.) See the Testing and Inspection
section of this manual for more information. Because
underground drainage pipe is usually the largest diameter
pipe, it is necessary to restrain the system or joints from
movement at changes in direction and end of runs prior
to testing. This may be done by partially backfilling and
leaving the joints exposed for inspection or rodding and
or bracing.
INSTALLATION PROCEDURES
FOR CAST IRON
• NEVER test with or transport/store
compressed air or gas in Cast Iron pipe
or fittings.
• NEVER test Cast Iron pipe or fittings
with compressed air or gas.
• ONLY use Cast Iron pipe and fittings
for drain, waste and vent or sanitary
sewer applications.
Testing with or use of compressed air or gas in Cast Iron
pipe or fittings can result in explosive failures and cause
severe injury or death.
After testing is completed, the trench can be properly
backfilled. When backfilling, care should be taken to
protect the pipe from large rocks, stones, or frozen fill
material that could damage the pipe. Cast iron soil pipe
laid on a solid trench bottom does not require special
backfilling or procedures.
Installers should always consider local conditions, codes,
manufacturers’ instructions, and engineers’ instructions
in any installation.
NOTE: This manual is not a complete engineering
reference addressing all aspects of design and installation
of cast iron soil pipe. The Cast Iron Soil Pipe Institute
handbook is also an excellent reference for engineers.
Under-slab Installation
Although cast iron soil pipe, fittings, couplings and gaskets
are unaffected by direct contact with concrete, care must
be taken to properly support any piping system when
pouring concrete so that the weight of the concrete does
not affect the piping system. While not required due to
any corrosion issues, a good practice to aid in any future
maintenance or excavation of a system would be to loosely
wrap both hub-and-spigot joints and hubless couplings
with polyethylene sheet so that concrete does not become
imbedded into crevices, shields or clamps on couplings.
Some codes require sleeving or protection of piping
at slab penetrations. While not necessary due to
any corrosion issues, always follow applicable code
requirements on any installation.
ABOVE GROUND INSTALLATION
PROCEDURES
Failure to follow proper installation practices,
procedures, or techniques may result in personal injury,
system failure or property damage.
• Always use protective equipment including eye
protection and safety clothing while installing or cutting
pipe.
• Power equipment can be dangerous if used improperly.
Always review and carefully follow the manufacturer’s
operating and safety instructions.
Installing Vertical Piping
1. Secure vertical piping at intervals sufficiently close
to maintain correct pipe alignment and to support the
weight of the pipe and its contents. Support stacks at
their bases and at sufficient floor intervals to meet the
requirements of local codes. Use approved riser clamps,
floor clamps, or friction clamps for this purpose. If the
building is over two stories in height, support the stack
at the base and at each floor with an approved clamp.
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.
2. If vertical pipe is required to stand free of any support
by design specifications, or if no structure is available