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Bell & Spigot Couplers with “O” Ring Gasket Bell & Spigot Couplers with “O” Ring Gaskets - This type of CPP n/10 pipe comes with bell and spigot ends which are manufactured onto the pipe during the extrusion process, not welded on as some brands are. CPP believes that by manufacturing the bell and spigot with the pipe during the extrusion process that the homogenous makeup of the bell and spigot with the rest of the pipe insures longer strength and durability of the bell and spigot joints.
As with concrete, metal and clay pipes or Catch Basin/Manhole structure joint connection work, the pipe installer must take extra installation precautions as all coupling sites have historically been a Sinkhole formation problem, no matter the pipes raw material base. At any coupling junction Extra Installer care should be taken to insure that the uniform 95% Proctor Density compacted soil support is available totally around the pipe’s joint per plastic pipe installation specifications ASTM-D-2321 and PPI-CPPA-100. For Bell & Spigot couplers, the correct 95% Proctor Density soil compaction prevents deflection stress on CPP pipe from exceeding 5%. Proper compaction thus protects couplers from an over deflection induced pipe misalignment on the coupler “O” Ring seal as well. The bedding under the pipe should also reach a 95% Proctor Density compacted level to prevent reverse grades that could bend the pipe at the joint. Any reverse grades or poorly compacted side fill related misalignment that results in bending/snaking/pinching the pipe joint beyond 1.5 degrees will prevent a secure seal. Such can take place in soils that experience post installation, uncontrolled moisture levels. If CPP pipes are installed in soils that are expected
to experience any movement from a future high water table or soil-moisture
ratio change, a Gravel Pack Loadbearing Envelope, encased
in a Filter Wrap, should be used. Soils not reinforced properly to withstand soil-moisture
changes, can increase a pipes deflection to the point of jeopardizing
a joint leak resistant gasket seal. This is particularly true in non-cohesive
silts, Class IV and Class V soils. It should be noted here that the flexibility
of CPP pipes is an attribute that accommodates minor post installation
soil settling and shifting, and thus prevents many catastrophic joint
misalignments often experienced by more rigid pipe systems. The 20-foot
sections of CPP pipes also reduce joint failure opportunities, because
there are fewer joints. However, in Class IV, V or fluxing Water-Table
soils, soil reinforcement practices (as noted in ASTM-D-2321) must be
selected to assure performance as would be the installation practice
with rigid pipe products. Under these site conditions, a CPP
Mastic Wrap Coupler should be specified by the engineer to avoid leakage and future
possible Sinkhole formations. When using the CPP Bell & Spigot Gasket
coupler system, both the “O” Ring and the Bell Coupler ends
must be lubricated with a Non-Petroleum, Biodegradable pipe joint lubricant.
First the Protective Wrap should be removed from the Gasket. Both the
Male Spigot and the Female Bell ends should be cleaned prior to lubrication
to insure a secure seal. As corrugations can drag loose trench soil in
the coupling joint area, a clean plastic sheet of film should be placed
under the coupling joint work zone. The Bell End should cover two full
pipe corrugations on the Spigot End when fully seated.
CPP, INC. recommends the use of Non-Petroleum base spray
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Bell & Spigot
pipes are available in 20-foot lengths. Each coupler Spigot End comes
with a non-pressure pipe water leak restriction gasket manufactured per
ASTM-F-477. Should gravity flow pressure tests be required per ASTM-F-1417,
one should not test until the pipes have been backfilled or restrained
for safety.
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