tank gauging
New entrant marinises land- based gauging system
Manufacturers are developing their technologies and even drawing inspiration from outside the industry to enhance accuracy
G
auging Systems Inc of the US is in the process of re-engineering its latest land-based tank gauging
technology and certifying it for marine use. The system is called the Multi-function Tank Gauge (MTG) and the company is in discussions with three shipowners regarding US Coast Guard testing. Gauging Systems Inc claims to produce the world’s most accurate volume tank gauges. They provide readings for volume, mass, level, multi-point spot temperature, average product temperature, multi-strata density, average product density, free water, suspended water, vapour pressure and vapour temperature. The only differences between the land-
based technology and the marine system are the transmitter head material and sealing flange. The MTG 3012 Multi-function Tank Gauge instrument is composed of multiple
(4-12) sensor sections. Each sensor section includes a high-accuracy pressure transducer and provides multiple measured or calculated data variables that can be used for alarm purposes. That means the MTG 3012 can provide primary level and multiple alarm data variables from multiple sensors to provide redundancy. The multiprocessor transmitter card supports 1,000 strapping points and provides volumetric calculations to API, ISO or GOST standards. The system has only one tank entry and one electrical connection. It is bottom referenced, self-calibrating, self- diagnostic, and has no moving parts. The MTG 3012 calculates all necessary data
for volume to custody transfer accuracy within the transmitter head. MODBUS remote terminal unit registers are accessible for calculated data, measured data, diagnostics and sensor data in millivolts. The system’s communications allow the polling and data collection of the raw millivolt readings directly from the sensors, making possible historical monitoring of the sensors for drift or other problems. If a sensor does fail, the transmitter will
turn off that sensor, provide a diagnostic indication of the failed sensor, and formulate
Gauging Systems has had its system certified for marine use
Calibrating a cargo tank monitoring system. Krohne’s systems fulfil Chevron requirements for redundant monitoring of cargo tankers
www.tankershipping.com Tanker Shipping & Trade I October/November 2011 I 37
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