Sheet 4343-11 Page 3
60
FUEL TUBE GAS FLOW
4343 sizes -9 through -12-B (with plug fully retracted)
These graphs can be used to determine maximum gas pressure required at the fuel tube for TwinBed ® II. Do not use the graphs for burner adjustment. An orifice or other flow meter is necessary to determine actual gas flow when making adjustments. Gas flow is dependent upon both inlet gas pressure and the position of the mixing rate adjustment plug in the case of the larger fuel tube (TwinBed II sizes -9 through -12-B.) The gas pressure drop is much higher when the mixing rate adjustment plug is full extended than when retract- ed. The pressure is somewhere between these extremes when the plug is in any other position.
50
40
30
20
10
Note that the "Y" axis is different for each graph.
0
0 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 Natural Gas Flow, scfh
250
4343 sizes -9 through -12-B (with plug fully extended)
200
150
100
50
0
0 5000 10000 15000 20000 25000 30000 35000 40000 45000 50000 Natural Gas Flow, scfh
WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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