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1. Pipework
size
15 mm pipe
22 mm pipe
2. elbows
size
15 mm
22 mm
Pipework (1) + elbows (2) = head of water required
The figure above is the minimum head that must be provided from the top of the appliance
to the base of the cold water cistern to ensure adequate performance.
eg.
15 mm pipe length is 4 metres (the head loss per metre is 80 mm).
Therefore
4 x 80 = 320 mm
Number of 15 mm elbows used is 5 (the head loss per elbow is 30 mm).
Therefore
5 x 30 = 150 mm
Pipework (320 mm) + Elbows (150 mm) = 470 mm
Head of water required between base of
cold water cistern and top of appliance =
Quantity a
(m)
(m)
Quantity c
head loss Per
Metre b
80 mm
15 mm
head loss Per
elbow D
30 mm
10 mm
470
mm
Total head loss
(mm) a x b
Total head loss
(mm) c x D
mm
13
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