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Clamps must not exert compressive stresses on the pipe. If possible, the <br /> clamps should be located directly below a coupling so that the shoulder of the <br /> coupling rests against the clamp.A coupling can be modified to achieve this <br /> by cutting a CPUC coupling just above the stop at the socket bottom. Then, <br /> cut this piece in half lengthwise to provide two halves that do not contain the <br /> stop, Follow the "Solvent Cement Welding Instructions" to cement the two <br /> halves to the pipe at the required location, and make sure that the shoulder of <br /> the modified coupling rests on the clamp.Allow the assembly to cure before <br /> placing any stress on the joint. <br /> WARNING: CPUC pipe and/or system components must not be used to <br /> provide structural support for the system. Care should be used when <br /> installing, hanging, or bracing to prevent unnecessary stress loads on <br /> the CPUC piping system. <br /> Exposed Installations <br /> For exposed installations that incorporate pendent or sidewall sprinklers, <br /> UL Fisted support devices for thermoplastic sprinkler piping, or other listed <br /> support devices shall be used to mount the piping directly to the ceiling or <br /> sidewall. <br /> Earthquake Bracing <br /> Since CPVC fire sprinkler plastic piping is more ductile than metallic sprinkler <br /> pipe, it has a greater capacity to withstand earthquake damage. In areas <br /> subject to earthquakes, CPUC fire sprinkler systems should be designed and <br /> braced in accordance with local codes and NFPA Standard 13. <br /> Trenching <br /> The trench for underground fire service applications should be of adequate <br /> width to allow convenient installation,while at the same time being as narrow <br /> as possible. Minimum trench widths may be utilized by joining pipe outside <br /> of the trench and lowering it into the trench after adequate joint strength has <br /> been achieved. <br /> CAUTION - Refer to the set and cure times listed in this manual for solvent <br /> cement joints. Failure to follow these cure times before installing piping <br /> systems in trenches could result in joint separation. Trench widths have to <br /> be wider where pipe is joined in the trench or where thermal expansion and <br /> contraction is a factor. Refer to the"Snaking/Deflection of Pipe section. <br /> Page 42 O 2010 SpearsO Manufacturing Company FC-3-1010 <br />