French Water Supply Fixture Unit

Howto calculate the diameter of the tubing in sanitary installations

This little online script use the french plumbing code. It's the DTU 60.11 which is used. The pressure of water is considered at 43.5 psi (3 bars). The frenchies use "pressure reducers" to get this pressure level.

Fixture	Number - cold water	Number - hot water	Coefficient
Toilet (with flush), washbasin (hand), urinal, floor trap		-	0,5
Bidet, clothes washer, dish washer			1
Sink (bathroom)			1,5
Shower			2
Sink (kitchen)			2,5
Bathtub			3
Number of liter after 150 litres			0,01

Results of the calculation :

	Cold water	Hot water
Coefficient computed	0	0
Minnimum inner diameter of the supplying tube :

Abacus used by the french code :

Coefficient	Minimum inner diameter	Corresponding tubing (CTS)
2	10 mm	3/8 ''
3	12 mm
4	13 mm	1/2 ''
7	16 mm	5/8 ''
12	19 mm	3/4 ''
15	20 mm

This chart is extracted from this graph of the french plumbing code :

Conclusion.

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Created : 17 feb 2007  - Update : 27 feb 2007

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