Page 64 - CPVC Fire Sprinkler Products Installation Instructions & Technical Handbook
P. 64

Using a clean, dry rag, wipe loose dirt and moisture from the fitting socket and pipe end. Moisture can slow the cure time and at this stage of assembly, and excessive water can reduce joint strength.
The pipe should easily enter the fitting socket one-third to two-thirds of the way. Contact between the pipe and fitting is essential in making a good joint. This contact allows the solvent cement (which is applied in the next step) to effectively join the pipe and fitting.
Use a dauber that is properly sized for the pipe. For 3/4 in. (DN20) and 1 in. (DN25) pipe, use a dauber that is 3/4 in. (19,1 mm) in size. For 1 1/4 in. (DN32) through 3 in. (DN80) pipe, use a dauber that is 1 1/2 in. (38,1 mm) in size.
Pint cans are furnished with 3/4 in. (DN20) daubers. Quart cans are furnished with 1 1/2 in. (38,1 mm) daubers. Additional daubers can be obtained through Customer Service.
All solvent cement joints shall be made with TFP-500 or TFP-600 One Step Solvent Cement, as applicable (see LISTINGS/APPROVALS).
Apply a heavy, even coat of cement to the outer wall of the pipe end. Apply a medium coat to the inside of the fitting socket. Pipe sizes 1 1/4 in. (DN32) and above shall always receive a second cement application. FIRST APPLY CEMENT ON THE PIPE END, THEN IN THE FITTING SOCKET, AND, FINALLY, ON THE PIPE END AGAIN.
Too much solvent cement can cause clogged waterways or weaken the wall of the pipe or fitting and result in pipe failure or leakage, which may not appear until after the pipe and/or fitting is in service.
• Do not allow excess cement to puddle in the pipe and fitting assembly. To prevent this puddling, apply a lighter coating of solvent cement to the inside of the fitting socket than the outside of the pipe.
• Wipe off excess cement on the outside of the joint. The solvents will evaporate, but the solvent cement inside the fitting will stay there.
Special care shall be exercised when assembling CPVC fire sprinkler systems in temperatures below 40°F (4°C). In colder temperatures extra time must be allowed for the solvent cement to set and cure. Extra care should be taken to prevent damaging the pipe during handling. (See Notice located on Page 58, Handling - Pipe and Fittings section.) When solvent cementing pipe and fittings in colder temperatures, make certain that the cement has not become lumpy or has not “gelled”. Gelled cement must be discarded.
At temperatures above 80°F (27°C) make sure both surfaces to be joined are still wet with cement during assembly. Higher temperatures and/or wind accelerate the evaporation of the volatile solvents in the cement. Pipe stored in direct sunlight may have surface temperatures 20°F to 30°F (-7°C to -1°C) above the air temperature. If possible, store the pipe and fittings, or, at least the ends to be solvent welded, out of the direct sunlight prior to cementing. The solvents will penetrate hot surfaces more deeply. In such conditions, it is very important to avoid puddling the solvent cement inside the fitting socket.

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