gledhill BMA 120 SP, Инструкции по проектированию, установке и обслуживанию

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