Difference Between PVC and CPVC Pipe

Posted by Kunal Sutar on January 25th, 2021

Whether you wish to hire a plumber for routine repairs or are a DIY lover, understanding the difference between frequently used PVC and CPVC pipes is important for using these plumbing pipes for water supply, sewer, or drainage. For regular plumbing purposes, PVC (Polyvinyl Chloride) and CPVC (Chlorinated Polyvinyl Chloride) are commonly used across different regions and locations. Plastic pipes do not corrode and are light in weight as compared to galvanized and lead pipes. These pipes are also comparatively easy to cut and join. You do not need to bother about welding these pipes.

PVC, or polyvinyl chloride, pipe is a drain or vent type of plumbing pipe and are well-known because they are very easy to install and less heavy than steel pipes. There are a few major differences between PVC and CPVC pipes. Let's do a deep-dive and learn the differences in detail.

1) Chlorine Component: The manufacturing procedure of CPVC pipes involves the use of chlorine and the chlorine percentage in CPVC pipes could be as high as 20 percent. Put simply, CPVC pipes are PVC pipes with chlorine components included in their composition. It should be kept in mind that the chlorine in the CPVC pipes does not have any effect on the water flowing through these pipes.

2) Resistance to Temperature: For water uses below 140 degrees Fahrenheit, PVC pipes are considered safe. For temperatures above 140 degrees, Fahrenheit and as high as 200 degrees Fahrenheit, CPVC pipes are highly recommended. It is recommended to use these pipes within their permitted temperature limits to avoid leakages and softening of these pipes.

3) Size Standards: PVC pipes are usually sized according to Iron Pipe Size Standards or IPS. Although CPVC pipes can be sized as per Iron Pipe Size Standards, they are normally sized according to Copper Tubing Size or CTS standards. It should be noted that PVC and CPVC cannot be joined together.

4) Price Factor: PVC pipes are somewhat more economical as compared to CPVC pipes. CPVC pipes, in turn, are less expensive than PEX pipes. Based on your budget and objective, you can go for either PVC or CPVC pipes.

5) Applications: PVC pipes are suitable for the service line as well as underground use. Using CPVC pipes for underground water supply is not the most ideal strategy cost-wise as CPVC pipes are priced much higher as compared to PVC pipes. PVC pipes can be utilized for irrigation and sprinkling purposes in the agriculture sector. CPVC pipes are best for indoor water distribution, specifically for those areas where soil or water conditions are corrosive. In metalworking sectors and workshops, CPVC pipes are chosen over PVC pipes for a fire sprinkler system.