22
B. Deburring
Use a knife, plastic pipe deburring tool, or fi le to remove burrs from
the end of small diameter pipe. Be sure to remove all burrs from
around the inside as well as the outside of the pipe. A slight chamfer
(bevel) of about 10°-15° should be added to the end to permit easier
insertion of the pipe into the end of the fi tting. Failure to chamfer the
edge of the pipe may remove cement from the fi tting socket, causing
the joint to leak.
STEP B
C. Test dry fi t of the joint
Tapered
fi tting sockets are designed so that an interfaced fi t should
occur when the pipe is inserted about 1/3 to 2/3 of the way into the
socket. Occasionally, when pipe fi tting dimensions are at the tolerance
extremes, it will be possible to fully insert dry pipe to the bottom of
the fi tting socket. When this happens, a suffi cient quantity of cement
must be applied to the joint to fi ll the gap between the pipe and fi tting.
The gap must be fi lled to obtain a strong, leak-free joint.
D. Inspection, cleaning, priming
Visually inspect the inside of the pipe and fi tting sockets and remove
all dirt, grease or moisture with a clean dry rag. If wiping fails to clean
the surfaces, a chemical cleaner must be used. Check for possible
damage such as splits or cracks and replace if necessary.
Depth-of-entry
Marking the depth of entry is a way to check if the pipe has reached
the bottom of the fi tting socket in Step F. Measure the fi tting depth
and mark this distance on the pipe O.D. You may want to add several
inches to the distance and make a second mark as the primer and
cement will most likely destroy your fi rst one.
Apply primer to the surface of the pipe and fi tting socket with a natural
bristle brush. This process softens and prepares the PVC or CPVC
for the solvent cementing step. Move quickly and without hesitation
to the cementing procedure while the surfaces are still wet with
primer.
E. Application of solvent cement
• Apply the solvent cement evenly and quickly around the outside
of the pipe at a width a little greater than the depth of the fi tting
socket.
• Apply a light coat of cement evenly around the inside of the
fi tting socket. Avoid puddling.
• Apply a second coat of cement to the pipe end.
STEP E
F. Joint assembly
Working quickly, insert the pipe into the fi tting socket bottom and
give the pipe or fi tting a 1/4 turn to evenly distribute the cement. Do
not continue to rotate the pipe after it has hit the bottom of the fi tting
socket. A good joint will have suffi cient cement to make a bead all
the way around the outside of the fi tting hub. The fi tting will have a
tendency to slide back while the cement is still wet so hold the joint
together for about 15 seconds.
STEP F
G. Cleanup and joint movement
Remove all excess cement from around the pipe and fi tting with a
dry cotton rag. This must be done while the cement is still soft.
The joint should not be disturbed immediately after the cementing
procedure, and suffi cient time should be allowed for proper curing of
the joint. Exact drying time is diffi cult to predict because it depends
on variables such as temperature, humidity and cement integrity. For
more specifi c information, you should contact your solvent cement
manufacturer.
STEP G
