How to Guide

35
A caulked joint may also be used to join hub and spigot
cast iron soil pipe, as follows:
1. Place the spigot end of a pipe or fitting inside the
hub of another pipe or fitting and align correctly,
making sure that all surfaces are clean and dry.
2. Place oakum into the joint using a yarning iron.
3. Pack the oakum to the proper depth using a packing
iron.
4. Pour molten lead into the joint, filling it to the top
of the hub. For a horizontal joint, use a joint runner
to retain the molten lead in the hub.
INSTALLATION PROCEDURES
FOR CAST IRON
5. After the lead has cooled somewhat and solidified,
the joint is ready to be caulked. Caulk the joint with
inside and outside caulking irons. Caulking the joint
sets the lead and makes a leak-free joint.
HUBLESS JOINTS
The shielded coupling for hubless cast iron soil pipe and
fittings provides a more compact installation without
sacrificing the quality and performance of cast iron.
The hubless coupling system typically uses a one-piece
neoprene gasket and a shield of stainless steel retaining
clamps. The great advantage of the system is that it
permits joints to be made in limited-access areas. The
300 series stainless steel, which is always used with
hubless couplings, was selected because of its superior
corrosion resistance. It is resistant to oxidation, warping
and deformation, offers rigidity under tension with
To reduce the risk of serious or fatal injury from explosions
or burns, use caution when handling molten lead.
• Never allow molten lead to contact liquids including
water, because it may explode.
• Molten lead is extremely hot and handling can be
dangerous.
• Always utilize protective eye wear, safety clothing and
equipment when making a caulked joint.
substantial tension strength, and still provides sufficient
flexibility.
The neoprene gasket absorbs shock and vibration, and
helps eliminate galvanic action between the cast iron
and the stainless steel shield. The neoprene sleeve is
protected by a non-combustible stainless steel sleeve.
Joint deflection using a shielded hubless coupling has a
maximum limit of up to 5 degrees. 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.
Installation should initially be completed in a straight
line and then deflected to the appropriate amount. This
helps assure a good tight joint. For more than 5 degrees
of deflection, fittings should be used.
Hubless couplings are used to connect cast iron pipe and
fittings. The couplings are composed of a stainless-steel
shield, clamp assembly and an elastomeric sealing sleeve
made of neoprene. It is important to note that hubless
couplings are manufactured to CISPI 310 and ASTM C
1277, while the heavy duty couplings are manufactured
to ASTM C 1540.
NOTE: Charlotte Pipe does not recommend or warrant
installations joined with unshielded 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 this company.
Horizontal pipe and fittings five (5) inches and larger
must be suitably braced to prevent horizontal movement.
This must be done at every branch opening or change
in direction by the use of a brace, block, rodding or
Horizontal pipe and fittings five (5) inches and larger must
be suitably braced to prevent horizontal movement. 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.
Heavy Duty or wide body couplings are not a substitute for
proper thrust restraint. Failure to properly restrain branch
openings or changes in direction will result in joint
movement or separation, causing system failure and
potential serious injury.