API 2556 : 1993 : R2013

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 in this publication as any material that adheres to the internal vertical sidewall surfaces of a tank when the tank is otherwise empty. The tables given in this recommended practice show the percent of error of measurement caused by varying thickness of uniform incrustation in tanks of various sizes.