Page 76 - CPVC Fire Sprinkler Products Installation Instructions & Technical Handbook
P. 76

a Drain Vac unit to be sure all water is removed from the system. Moisture
can slow the cure time and will reduce joint strength.
• Carefully review and follow the solvent cementing procedures for proper joining techniques prior to commencing the cut-in (pipe must be cut square to proper length, de-burred, beveled and dry to ensure proper insertion depth and system integrity).
• Carefully measure and cut pipe to proper length to ensure complete insertion during assembly (first check the interference fit of the components being joined).
Note: During assembly of the cut-in tee (and other components), it is important to make a one-quarter turn when inserting the pipe into the fitting per the installation instructions. This may require the use of sev- eral components assembled in combination with the cut-in tee to cre- ate a short spool piece assembly. This can be accomplished by using socket unions, flanges, or grooved coupling adapters that will ensure that a one-quarter turn can be obtained on all pipe connections being joined.
• Prior to applying the solvent cement, use a clean dry rag to wipe moisture and dirt from the fitting socket and the pipe end (the presence of moisture on the joining surfaces will reduce joint integrity).
• Use a new can of solvent cement when making cut-in connections (verify expiration dates stamped on can prior to use).
• After all work is completed, the cut-in joints must be allowed to cure properly prior to pressure testing as shown in the Tables U, V, and W.
• After work is completed and the cut-in cure times are met, inspect work for proper alignment and hanger placement prior to pressure testing.
• After cut-in cure times are met, the system must be slowly filled with water and the air bled from the farthest and highest sprinklers before test pressure is applied. (See instructions regarding pressure testing the system.)
• After cut-in cure times are met and the air is bled from the system, pressure testing of the portion of the sprinkler system containing the cut-in tee is recommended. Prior to pressure testing, the system must be isolated off to its smallest area using floor valves, etc., to isolate the cut-in area. Additionally, the recommended test pressure to be applied is a maximum of 50 psi (3,4 bar) over the system operating pressure. Should a leak occur, this approach will minimize the potential for water damage.
• When tying into a TYCO CPVC piping system that has been painted with water based latex paint, the paint on the end of the piping should be removed with a fine grain sand paper approximately 1/4 in. to 1/2 in. (6,4 mm to 12,7 mm) beyond the make-in of the fitting being added. Care should be exercised to assure that material is evenly removed from the entire circumference of the piping. The outside diameter of the piping should be measured and compared to Tables D1 and D2. If too much material is removed at one location along the circumference, it could result in a leak point once the fitting is solvent welded to the piping. Special care should be made when selecting the fitting that will be attached to the recently cleaned piping. Check the dry fit of the pipe and fitting. The pipe should

   74   75   76   77   78