®
and cement cans.)
Application of solvent cement:
A critical part of the solvent cementing process is to make sure the cement is well mixed. Periodically cover the container and shake the cement to make sure it stays mixed and uniform. Apply the solvent cement evenly and quickly around the outside of the pipe and at a width a little greater than the depth of the fitting socket while the primer is still wet. Apply a lighter coat of cement evenly around the inside of the fitting socket. Avoid puddling. Apply a second coat of cementing to the pipe end. For sizes six-inches and above, and pos- sibly four-inches in hot weather, consider use of two-man crews to prime both pipe and fitting surfaces effectively and apply the cement while the material is still wet with primer.
(Note: When cementing bell-end pipe, be careful not to apply an excessive amount of cement to the bell socket. This will prevent solvent dam- age to the pipe.)
Joint assembly:
Working quickly, squarely insert the pipe into the fitting socket, giving the pipe or fitting a quarter turn during insertion to evenly distribute the cement. Do not continue to rotate the pipe after it has hit the bottom of the fitting socket. A good joint will have sufficient cement to form a uniform bead all the way around the outside of the fitting hub. The fitting will have a tendency to slide back on the pipe while the cement is set- ting, so hold the joint tightly together for about 30 seconds. Use the cement manufac- turer’s written recommendations regard- ing joint set time, for initial movement of a joint and cure time before a pressure test. For pipe sizes four-inches and above, greater axial forces are necessary for the assembly of interference fit joints. Mechanical equipment may be needed to join the pipe and hold the joint until the cement “sets.”
(Note: Always wait at least 24 hours before pressure testing a piping system to allow cemented joints to cure properly. For colder temperatures, it may be necessary to wait a longer period of time. Please reference the sol- vent cement manufacturer’s curing time.)
Clean-up and joint movement:
Remove all excess cement from around the pipe and fitting with a dry, cotton rag or cloth. This must be done while the cement is still soft. This information covers the basic principles and steps involved in solvent cement connec- tion for thermoplastic pipe and fittings. For applications where temperature con- ditions or variations in sizes and fits of pipe and fittings pose additional challenges, successful joints can be achieved providing special care is taken.
WT
Gary Sample is technical product manager for GF Piping Systems. For more information, please visit www.gfpiping.com or call 800-854-4090. The author can be reached directly at gary.sample@georgfischer.com or 501-490-7376.
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