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Cutting
Corzan pipe can be easily cut with a ratchet cutter, wheel
type plastic tubing cutter, power saw, or fine-toothed saw. To ensure the pipe
is cut square, a mitre box must be used when cutting with a saw. Cutting the
pipe as squarely as possible provides the maximum bonding surface area.
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Deburring
Burrs and filings can prevent proper contact between the pipe
and fitting and may put undue stress on the pipe and fitting assembly. Burrs
and filings must be removed from the outside and inside of the pipe. A
chamfering tool or file is suitable for this purpose. A slight bevel should be
placed at the end of the pipe to ease entry of the pipe into the socket and
minimize the chances of wiping solvent cement from the fitting.
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Fitting Preparation
Loose dirt and moisture should be wiped from the fitting
socket and pipe end with a clean, dry rag. Moisture can slow the curing, and at
this stage of assembly excessive water can reduce the joint strength. The dry
fit of the pipe and fitting should be checked. The pipe should enter the
fitting socket easily 1/4 to 3/4 of the depth. If the pipe bottoms in the
fitting with little interference, extra solvent cement should be used to
prepare the joint.
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Primer Application
Primeris needed to prepare the bonding area for the addition
of the cement and subsequent assembly. It is important that a proper applicator
be used. A dauber or paintbrush approximately half the size of the pipe
diameter is appropriate. A rag should not be used. Primer is applied to both
the outside of the pipe end and inside of the fitting socket, redipping the
applicator as necessary to ensure that the entire surface is tacky.
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Solvent Cement Application
Solvent cement must be applied when the pipe surface is tacky,
not wet, from primer. Joining surfaces must be penetrated and softened. Cement
should be applied with a natural bristle brush half the size of the pipe
diameter. A dauber may be used to apply cement on pipe sizes below 2 inches. A
heavy, even coat of cement should be applied to the outside of the pipe end,
and a medium coat should be applied to the inside of the fitting socket. Pipe
sizes greater than2 inches should receive a second coat of cement on the pipe
end.
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Assembly
After cement application, the pipe should immediately be
inserted into the fitting socket and rotated ¼ turn. The fitting should be
properly aligned for installation at this time. The pipe must meet the bottom
of the fitting socket. The assembly should be held in place for 10 to 15
seconds to ensure initial bonding. A bead of cement should be evident around
the pipe and fitting juncture. If this bead is not continuous around the socket
shoulder, it may indicate that insufficient cement was applied. In this case,
the fitting should be discarded and the joint reassembled. Cement in excess of
the bead may be wiped off with a rag.
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Set and Cure Times
Solvent cement set and cure times are a function of pipe size,
temperature, relative humidity, and tightness of fit. Drying time is faster for
drier environments, smaller pipe sizes, high temperatures, and tighter fits.
The assembly must be allowed to set, without any stress on the joint, for 1 to
5 minutes depending on the factors just discussed. Following the initial set
period, the assembly can be handled carefully avoiding significant stresses to
the joint. Refer to the following table for minimum cure times prior to
testing.
Extra care should be exercised when systems are
assembled in extreme temperature conditions. Extra set and cure times should be
allowed when the temperature is below 40°FWC). When the temperature is above
100°F (38°C), the assembler should ensure that both surfaces to be joined are
still wet with cement before joining them.
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