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In order to attain a properly working system of any kind, certain calculations must be done to uphold the volume of water inside of the system. When installing a domestic plumbing system, hydronic heating system, radiant heating system, or even simpler installations such as dishwashers, water volume must be regulated. Shown in the tablet above is the water volume found within different sizes and types of PEX Tubing and Copper Pipe. Canarsee has even included the volume of water inside of PEX-Al-PEX Pipes as well. The ‘PEX Pipe’ portion of the tablet is used for both Oxygen Barrier PEX Tubing, and Non-Barrier PEX Tubing.
Pipe diameter size in inch | PEX Pipe | PEX-Al-PEX Pipe | L Copper Pipe | M Copper Pipe |
| Volume in Gallon per feet | ||||
3/8" | 0.00529 | 0.00489 | 0.007 | 0.00827 |
1/2" | 0.00961 | 0.01038 | 0.012 | 0.0132 |
5/8" | 0.01393 | 0.01658 | - | - |
3/4" | 0.01894 | 0.02654 | 0.025 | 0.0269 |
1" | 0.03128 | 0.04351 | 0.043 | 0.0454 |
1-1/4" | 0.04668 | - | 0.065 | 0.068 |
1-1/2" | 0.06516 | - | 0.092 | 0.095 |
2" | 0.1116 | - | 0.161 | 0.165 |
This information is used to ensure that the system for which the piping is being applied can perform at an optimal rate. Having a lack of volume inside the piping of a system can lead to lack of pressure causing improper functioning. Therefore the installer must always be aware of the volume of water necessary to fill the system adequately. There is also a formula to determine the volume of water for any size pipe. Since a pipe has all the same dimensions of an elongated cylinder, the simple geometric formula can be utilized to figure out its volume capacity. Formula for Volume of Copper Pipe = Pi (3.14) x Radius* Squared x Height *Radius is equivalent to half the measurement of the diameter.*
