3 Commissioning Procedure
Mk8 MM Manual Page | 95
How to use this information:
1. Measure Volumetric flow of gas for 1min in ft3 (i.e. ft3/min). Note 1m3 = 35.31ft3
2. Multiply this volume flow by 60 to give volumetric flow per hour (i.e. ft3/hr).
3. Measure the pressure of the gas supply.
4. Use the table above to obtain a conversion factor.
5. Multiply the volume flow per hour by the conversion factor to obtain a volume at reference conditions.
6. For natural gas, the calorific value is typically 1000 Btu/ft3. To obtain the firing rate of the boiler at
standard reference conditions multiply the volume at reference conditions by 1000.
Represented as an equation:
Firing rate = (Measured Volumetric flow per minute x 60 x Conversion factor x 1000) Btu/hr
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