MHS Boilers Strata 2 - Page 12

12
STRATA2
4.3 flue options & terminal position (contd)
multiple flue system calculation
For flue component resistance for multiple boiler installations refer to graph below.
Volume flue gas per boiler = 170m
3
/h
Volume combustion air per boiler = 130
3
/h
Assume resistance of 45° bend = 0.5 tube
Assume resistance of 90° bend or tee = 1.0m tube
150100
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200 250 300 350 400 450 500 550 600
resistance flue tubes
tube DN125
tube DN150
tube DN200
Resistance - Pa/m
Volume - m
3
/h
For larger volumes or resistance of alternative tube sizes, contact MHS Boilers Flue Department
flueing possibilities
typical conventional
flue installation.
Air for combustion taken from
the boiler room.
Boiler room MUST be
ventilated in accordance
with BS 6644:1991
flue system layouts