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Potable Water Pipe Sizing According to EN 806

This tool enables pressure loss analysis for potable water installation pipes inside buildings in accordance with the EN 806 standard. Depending on the pipe material (steel or PPRC), parameters such as diameter, flow rate, and friction loss per unit length (mH₂O, mmH₂O, bar, mbar, Pa, kPa/m) can be easily calculated. It provides fast and reliable results for plumbing design projects, improving engineering efficiency.
/m

TS EN 806 – Fixture Loading Units (LU)

According to TS EN 806-3, 1 LU = 0.1 L/s (QA).

Fixture
QA (L/s)
Qmin (L/s)
LU
Washbasin, hand basin, bidet
0.10
0.10
1
WC (cistern type)
0.10
0.10
1
Domestic kitchen sink, washing machine, dishwasher, shower head
0.20
0.15
2
Urinal (without flush valve)
0.30
0.15
3
Domestic bathroom
0.40
0.30
4
Garden / garage tap
0.50
0.40
5
Non-domestic kitchen sink (DN 20)
0.80
0.80
8
Non-domestic bathroom
0.80
0.80
8
Flush valve (DN 20)
1.50
1.00
15