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Hickory Industries, Inc.
4900 Westside Avenue, North Bergen, New Jersey 07047
Tel: [201] 223-0050 Fax: [201] 223-0950
N/45 Series Manual12/00
Page 8 of 38
1.7.1 Volumetric Method to Verify the High Flame Setting, Mathematical
WARNING! No other gas equipment can be in operation during this procedure.
Calculation of flow rate E in ft
3
/hour
E = FP
H
i
E = Flow rate in ft
3
/minute
FP = High Flame Power setting in BTU/hr
H
i
= Heating value in BTU/ft
3
Thus, for natural gas:
E = 60,000 BTU/hr = 57.75 ft
3
/hr = 0.96 ft
3
/min.
1040 BTU/ft
3
E = 0.96 ft
3
/min.
Calculation of the natural gas needed in 1 hour by a 45WDG (3 burners) at full power:
57.75 * 3 = 173.25 ft
3
/hr = 2.89 ft
3
/min.
The time and the flow measurements should be taken at the gas (flow) meter with a
chronometer (stop watch).
To run the test, open the manual gas cock valve, start up the unit according to the start-up
instructions on page 24 and set the manifold valves to the high flame setting ("on" position).
Allow the unit to pre-heat (burn) for 10 to 15 minutes. Verify that the flow rate is calibrated
to the appropriate flow rate indicated in the table.
in ft
3
/hr
Gas Flow
per Burner (40,000 BTU)
BTU/ft³
Heating Value in
Gas
High Flame Setting
Natural
Propane
Butane
1040 57.75
1.7 Natural Gas Flow Table
2500
2500
24.00
24.00