Converting WSFU to GPM
Converting Water Supply Fixture Units (WSFU) to GPM
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The Water Supply Fixture Units - WFSU - are used to determine the water demand in water supply systems. One WFSU for a singel unit corresponds to one GPM.
- 1 WSFU = 1 GPM
This conversion can only be used for one or a few fixtures. When the total amount for many fixtures are added up, the number must be compensated due to the intermittent use of the fixtures. This is normal taken care of in the tables available for sizing supply pipe lines.
When special equipment or manifolds are sized the table below can be used to indicate the flowrate. Note that the minimum flow rate can never be less than the fixture with the largest demand.
The tables below can be used to estimate the demand in the water supply system when the load in WSFU is known. There are tables for systems with and without flush valves.
Water Supply System without Flush Valves
| WSFU | GPM | ft3/min | liter/sec |
| 1 | 3 | 0.41 | 0.19 |
| 2 | 5 | 0.68 | 0.32 |
| 4 | 8 | 1.07 | 0.51 |
| 8 | 12.8 | 1.71 | 0.81 |
| 15 | 17.5 | 2.3 | 1.1 |
| 30 | 23.3 | 3.1 | 1.5 |
| 50 | 29.1 | 3.9 | 1.8 |
Water Supply System with Flush Valves
| WSFU | GPM | ft3/min | liter/sec |
| 5 | 15 | 2 | 1 |
| 7 | 19.8 | 2.7 | 1.3 |
| 10 | 27 | 3.6 | 1.7 |
| 15 | 31 | 4.1 | 2 |
| 20 | 35 | 4.7 | 2.2 |
| 30 | 42 | 4 | 1.9 |
| 50 | 50 | 6.7 | 3.2 |
Probably Water Supply Diagram
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