Fuel Gas Flow Correction

Assuming gas flow is measured using a conventional orifice plate type of flow meter we covered in Chapter 5 the correction necessary if working in units of normal volumetric flow, i.e. measured at standard conditions. 

Process Control A Practical Approach Myke King 2011 John Wiley Sons Ltd. ISBN 978-0470-97587-9 

On-stream analysers measuring molecular weight are normally marketed as densitometers and so we will base the control design on specific gravity (SG), defined as 

The molecular weight of dry air (MWair) is generally assumed to be 28.96, as derived from Table 10.1. 

On this basis the heating value of hydrocarbons varies with SG but in way which can be inferred from 

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