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APPENDIX B
An optional location where cupboard space is tight
Table 1: Maximum equivalent pipe length in 15mm copper
inlet pressure
(bar)
@ 9 l/m
2.0
2.5
3.0
Table 2: Maximum equivalent pipe length in plastic pipe
inlet pressure
(bar)
@ 9 l/m
2.0
2.5
3.0
The preferred solution where space will allow
Maximum equivalent length of pipe (m)
@ 12 l/m
25
10
75
30
150
60
Maximum equivalent length of pipe (m)
@ 12 l/m
1.5
15mm : 10
3.0
15mm : 20
4.5
15mm : 30
The pressure loss through a flow regulator at the
designated flow rate is about 1.8 bar. Therefore
for the flow regulator to control the flow rate at
pre-set level, the inlet pressure must be greater
than 1.8 bar. if the inlet pressure is lower, the
flow rate will be correspondingly less than the
pre-set values.
The maximum equivalent pipe lengths from
the manifold to the terminal fittings can be
estimated from the above information and
the resistance characteristics of the pipes.
The examples presented below are for 15mm
copper pipe in table 1 and for plastic pipework
in table 2.
@ 18 l/m
5
15
30
@ 18 l/m
15mm : 4.5
22mm : 40
15mm : 9.0
22mm : 80.0
15mm 13.5
22mm : 120
Page 38
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