Portable Tank Gauging Device Sonic Tape

TRIPLE  [ULLAGE(U). INTERFACE(I). TEMPERATURE(T)]  FUNCTION 

Model. “D-2401-2” 

In gauging cargo oil volume within a tank, oil levels are determined by measuring with a tank table. However, it’s important to note that oil levels vary with temperature, and crude oil often contains significant water content. This water naturally separates from the oil and settles at the bottom of the tank.

The “Sonic Tape” (a term commonly used by major oil companies) is a portable tank gauging device developed by MMC. It utilizes an ultrasonic sensing probe to detect liquid levels, allowing direct, accurate readings on the tape itself. Unlike conventional gauging methods that use a “sounding steel tape” to identify oil levels based on oil residues on the tape, the Sonic Tape provides high-precision readings without needing to average multiple measurements.

The MMC portable Sonic Tape is designed to work on vapor locks, ensuring compliance with marine safety standards by using restricted devices on deck. This closed system limits vapor emissions and enhances safety during tank gauging. According to the U.S. Coast Guard Marine Safety Center, such restricted devices are compliant with 45 CFR Part 39.30-1(i), as they minimize cargo vapor release into the atmosphere.

This device is intrinsically safe and meets IEC standards (Ex ia IIB T4) for use in explosive gas environments. Its intrinsic safety classification ensures reliable operation within hazardous areas, making it suitable for use in explosive atmospheres commonly found on oil tankers.