Page 65 - CPVC Fire Sprinkler Products Installation Instructions & Technical Handbook
P. 65

After applying cement, immediately insert the pipe into the fitting socket, while rotating the pipe one-quarter turn until the pipe bottoms out at the fitting stop. Rotate the pipe as it is inserted into the fitting, not after it has bottomed out in the fitting. Properly align the fitting for the installation at this time. Pipe must bottom to the stop. Hold the assembly for 30 seconds to ensure initial bonding. A bead of solvent 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. If insufficient cement is applied, the fitting must be cut out and discarded. Cement in excess of the bead should be wiped off with a clean, dry rag.
Failure to allow sprinkler fitting joints to cure before installing sprinklers may result in cement in the sprinkler waterway.
• Install sprinklers only after all the CPVC pipe and fittings, including the sprinkler adapters, are solvent cemented and allowed to cure for a minimum of 30 minutes.
• Donotinstallsprinklersinthefittingspriortothefittingsbeingcemented in place.
Exercise care when installing sprinklers. Allow sprinkler head fittings and previously joined fittings to cure for a minimum of 30 minutes prior to installing the sprinkler. When installing sprinklers, be sure to anchor or hold the pipe drop securely to avoid rotating the pipe in previously cemented connections.
Too much solvent cement can cause clogged waterways.
• Visually inspect sprinkler fittings to ensure that the waterway and threads are clear of any excess cement.
• Once the installation is complete and cured per Table U, V or W, hydrostatically test the system.
Set and Cure Times
Inadequate curing of solvent cement joints may cause pipe failure or leakage. Solvent cement set and cure times are a function of pipe size, temperature, relative humidity, and tightness of fit.
Cure times should be increased when moisture is present, such as during cut-ins to live sprinkler lines. (NOTE: A specific procedure for modifications or repairs to existing CPVC fire sprinkler lines is included in this manual.) The assembly must be allowed to set, without any stress on the joint, for 1 to 5 minutes, depending on pipe size and temperature. Following the initial set period, the assembly can be handled carefully, avoiding significant stresses to the joint.
See Tables U, V, and W for minimum cure times prior to pressure testing.

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