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Introduction 3098 Technical Manual
1-8
1.5 Applications
The following are typical applications where specific gravity measurement is an essential parameter.
1.5.1 Supplementary Gas Supply
This system is used to top up normal supplies during peak periods. Specific gravity monitoring of a propane/air mixture for
example, enables accurate control to be exercised over the ratio of the mixture, therefore ensuring that the correct burning
characteristic/calorific value is maintained.
1.5.2 Wobbe Index Measurement
The burning characteristic of a gas must be well established for efficient combustion and to ensure that no flame lift or
flame light-back occurs on a particular burner. Three criteria are used to establish this characteristic; calorific value,
specific gravity and flame speed. The calorific value and specific gravity are often combined to form the Wobbe Number
i.e:
Wobbe Number = C V
√G
where CV = Calorific value
G = Specific gravity
1.5.3 Consumer Gas Costing
This major application has already been described in the introduction, MASS to BASE VOLUME unit conversion, and may
be further illustrated by the following equations:
Base Unit Volume = Mass Flow
Base Density
i.e Vs = M
ρ
s
=
M
G
Z
Z
AA
G
ρ