API RP 2556 : 1993

Section 1 - General
1.1 Scope
1.2 Referenced publications
Section 2 - Typical conditions
2.1 Paraffin or asphalt
2.2 Corrosion
2.3 Temperature
Section 3 - Typical remedies
3.1 Lease automatic custody transfer (LACT)
3.2 Meters
3.3 Heat
3.4 Cleaning
3.5 Linear measurement
Section 4 - Tables
4.1 Gauge table notation
4.2 Tables for uniform incrustation
Tables
1 Approximate reduction of tank capacity by uniform
     incrustation in barrels per foot and percent
     capacity
2 Approximate reduction of tank capacity by uniform
     incrustation in cubic meters per meter and percent
     capacity

Incrustation is defined, for the purpose of this recommended practice, as any material that adheres to the internal vertical sidewall surfaces of a tank when the tank is otherwise empty.