Two types of measurement methods are used for tank gauging: volume or mass based.
In a volume based system, level is measured. In a mass based system, the measurement of the hydrostatic pressure of the liquid column is used. The users choice should, therefore, be based on how product inventory is calculated and accounted via volume or weight.
Both methods provide a direct measurement of one factor in the inventory equation, level or pressure. However, bulk storage tanks tend to have large diameters, store products with varying densities that can stratify, and require consideration for high tank levels and overfill protection. A small change in level can make a big difference in accountable volumes (level x diameter), while stratification can lead to level changes that are undetectable by mass based systems. Vendors, therefore, recommends level (volume) based measurement systems.
Float & Tape Tank Gauging
- Servo Tank Gauges Working Principle
- Level Measurement Multiple Choice Questions
- Float Type Level Indicator Principle
- Torque Tube Level Measurement Principle
- Displacer Level Transmitter Dry Calibration with Weights
- Float Level Measurement
- Displacer Level Transmitter 5-point Calibration
- Stilling Wells for Level Measurement
- Level and Density Measurement Objective Questions
- Open Tank Level Measurement using DP Transmitters Animation