How to calculate the water volume in the piping system?
We need to determine the volume in the piping system which contributes to the total volume
required by the system.
The following volumes per unit length can be used for this calculation. These figures are taken
from the pipe data tabulated in Appendix 1, 2 and 3:
Pipe Size Water volumn, litres/m
Steel, Schedule 40 (ST)
NPS 1/2" 0.196
3/4" 0.344
1" 0.558
1-1/4" 0.965
1-1/2" 1.313
2" 2.165
2-1/2" 3.089
Copper, Type L
OD 1/2" 0.094
5/8" 0.151
3/4" 0.225
7/8" 0.312
1-1/8" 0.532
1-3/8" 0.811
1-5/8" 1.148
2-1/8" 1.997
2-5/8" 3.079
PVC, DIN 8062
OD 20mm 0.227 20
25mm 0.353 25
32mm 0.581 32
40mm 0.908 40
50mm 1.425
50
The volume is then calculated by multiplying the above figures with the corresponding length
used in the system.
The volumes of all the different sizes used in the network is then added up to give the total
system volume.
Section 6 Page 89