Tank Gauging and Strapping

After you measure the height of the liquid in the tank, you refer to the strapping table computed specifically for that tank. A strapping table is a record of volume capacity in a tank by height increments. The strapping table accounts for imperfections in the shell of the tank. The strapping table converts tank dip readings to gross volumes for a particular tank.

This diagram illustrates measurements used for bulk stock in a tank:

Strapping tables might be set up in these ways:

Height Designation	Description
Shell height.	Distance between the bottom of the bottom angle of the tank and the top of the top angle of the tank.
Gauging height or Reference height.	Distance from the striking point on the tank floor (or strike plate) to a designated reference point on the gauge hatch.
Effective Inside Tank height.	Distance from the strike plate to the top angle, or where the product would begin to overflow. This height defines the upper and lower limits of the tank table.