Innage Calculation

Where:

H = Gauge reading

H1 = Strapping table gauge, the last entry where H1 < H

H2 = Strapping table gauge, the next entry after H1

X1 = Mass or volume from strapping table corresponding to H1

X2 = Mass or volume from strapping table corresponding to H2

X = Total observed mass or volume for gauge reading

EXAMPLE: Innage Strapping

The table below shows strapping table entries for a tank that is measured with an innage strapping table.

Innage Strapping Table Entries

Height (m)	Volume (m3)
0	0
0.1	245
0.3	543
0.5	766
0.7	1020
1	1232
1.1	1343
1.5	1567
1.8	1765
2.2	2121

Maximum Volume = 2121 m3

What is the total observed volume for a gauge reading of 2.2m?

This occurs between the 2.0 and 2.3ft gauge entries in the strapping table with the volumes of 705m3 and 1100m3 respectively. So the volume is calculated as follows: