Question 87

Chlorinated Poly Vinyl Chloride pipe joints shall be joined by solvent cement.

Solvent cement is the appropriate method for joining Chlorinated Poly Vinyl Chloride (CPVC) pipe joints, as it creates a strong bond by chemically melting the surfaces of the pipes and fittings together.

A) brazing

Brazing is a metal-joining process that involves melting a filler metal to join two pieces. It is not suitable for CPVC pipes, which are plastic, and thus require a different method that facilitates the bonding of plastic materials.

B) threading

Threading involves cutting threads into the ends of pipes to allow them to be screwed together. This method is not applicable to CPVC pipes, as they are typically not designed for threaded connections and require a solvent cement approach for effective sealing.

C) solvent cement

Solvent cement is specifically formulated for bonding CPVC pipes. It works by softening the pipe and fitting surfaces, allowing them to fuse together upon drying, which results in a durable, leak-proof joint ideal for plumbing applications.

D) heat-fused fittings

Heat-fused fittings are used in joining certain types of plastic pipes, such as polyethylene, but are not the correct method for CPVC. CPVC pipes require solvent cement for proper joining, as heat fusion is not compatible with their chemical structure.

Conclusion

Solvent cement stands out as the definitive method for joining Chlorinated Poly Vinyl Chloride pipe joints due to its effectiveness in creating strong chemical bonds suited for plastic materials. Other options like brazing, threading, and heat-fused fittings are inadequate for this specific type of piping system, rendering them incorrect in this context.