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MTG MULTI-FUNCTION TANK GAUGE

Multi-function Tank Gauge

MTG “Multi-function Tank Gauge” is an engineered instrument. It is designed to provide more usable information for Loss Control, Safety, Environmental, and Operations than any other tank gauge or system ever developed.

 

It provides and exceeds the data needed to meet a host of API Standards and Recommended Practices, as well as, ANSI, ASTM, GB/T, GOST, IEC, IEEE, ISO, NEC, NFPA, OIML, etc.

 

MTG provides Bottom Referenced Measurement (INNAGE or how much liquid is within the tank, i.e., not to be confused with the measurement of air space above liquid within a tank (Outage)).  MTG comes with a “Tank Reference Movement Indicator” that shows the change of the reference height from the top mounting flange when emptying or filling liquid. MTG “Multi-function Tank Gauge” calculates Volume by both Hybrid and Hydrostatic Methods to custody transfer accuracy.  Because MTG comes in direct contact with the liquid, it has numerus advantages over non-contacting Radar, Ultrasonic, and Sonar tank gauges in the accurate measurement of the other volume parameters (Temperature, Density, & Water) and operational information. Note: Some RTG systems claim non-contact measurement (for level, i.e., measurement of the air space), but then use additional instruments in direct contact with liquid for Volume measurement, i.e., an advertising shell game. 

 

Dependent upon the engineered configuration, MTG can provide Product quality, Overfill & Rupture Protection, Vapor Monitoring, Leak Detection, Product Stratification (Temperature, Density, and Water) and when combined with TG SOFT Server (Software), applications such as Transfer Ticketing, Yield Analysis, Sampling, In-Tank Blending, De-Watering, PRV Monitoring, Roof weight (Rain or Snow), etc. are available. Thus, MTG’s information provides a competitive advantage and short-term payback on your investment.

 

Dependent upon the engineered configuration, MTG can provide Product quality, Overfill & Rupture Protection, Vapor Monitoring, Leak Detection, Product Stratification (Temperature, Density, and Water) and when combined with TG SOFT Server (Software), applications such as Transfer Ticketing, Yield Analysis, Sampling, In-Tank Blending, De-Watering, PRV Monitoring, Roof weight (Rain or Snow), etc. are available. Thus, MTG’s information provides a competitive advantage and short-term payback on your investment.

 

Most tank gauging systems advertising custody transfer accuracy only communicate Five (5) data registers (Volume, Level, Average Temperature, Reference Density, and Free Water from multiple instruments and multiple tank entries (gaugewells). Note: The cost of an additional gaugewell will be much more expensive than the cost of the tank gauge system being installed.  

 

Most wireless tank gauging systems poll one tank at a time and are relatively slow even when communicating only five registers.  This is due to the processing of multiple readings to insure a correct reading of the level. Note: Most wireless tank gauging systems require wire and conduit for the connection of multiple instruments and power in addition to the “wireless” radio for signal. So which shell is the pea under?

 

The MTG “Multi-function Tank Gauge” normally provides Three-hundred and Seventy-five (375) usable data registers from one instrument from the same reference point or gaugewell as the manual hand line. Why? Because accurate measurement of volume requires more information and not just limited information due to measurement or communications method.  Because the tank gauge needs to be calibrated and accuracy verified in comparison to the reference, i.e., manual hand lines, electronic temperature measurement, and liquid sampling (Density & Water) from the same location in the tank.

 

Note: if you are going to run cable and conduit for power to the top of the tank, the cost of running additional cable for signal is not expensive (in comparison with the cost of additional gaugewells , i.e., taking a tank out of service, cleaning it, gas freeing it, safety inspection, hot work permits, gaugewell fabrication, structural tank modifications, roof modifications, access location on tank top (gauge platform), closing up the tank, gauge and additional instruments installed, electrical conduit, hydrostatic (water fill) testing, new tank tables, and calibration of all instrument for installed accuracy.  Run the cable or Fiber, conduit or tray cable, for current and future needs, added security, and both the amount & speed of data throughput.

 

Further advice:  If you see a vendor specification that lists only one parameter (Level) for measurement to custody transfer accuracy, then they haven’t figured out that petroleum-based products are measured & bought or sold by Volume.   A well written tank gauging specification will require accuracy standards for all parameters in measuring or calculating volume.  Have you found the pea yet?

•  Does Volume change when using Average Temperature, three-wire RTD’s, thermistors, or IC’s are used vs. Multi-point spot temperature, Class A or Din, 100 Ohm Platinum, Four-wire RTD’s?

 

•  Does Volume change when ground temperature and the liquid temperature of the bottom three feet (1m) isn’t measured?

 

•  Does a 1-degree (Fahrenheit) change in temperature on most products change level more than the stated difference in level accuracy between an RTG and other technologies?

 

•  Does Volume (and quality) change when measuring stratified product when using no density or reference density vs. multi-strata density?

 

•  Does Volume and quality change when using free water vs. total water percentage (free, emulsified, and entrained) by strata?

The MTG provides more usable data from a single instrument than any other tank gauge on the market. MTG provides the following measured and calculated parameters: Volume, Level, Multi-point spot temperature, Average product temperature, Product head mass, Product heel mass, Product mass, Product apparent mass, Total measured mass, Water mass, Total estimated mass, Multi-strata density, Average product density, Percentage of water by strata, Free water, Emulsified water, Entrained water, Stratification of product by temperature, density, and water, Vapor (pressure, temperature, density). An optional sensor is available for ambient (pressure, temperature, density) (see MTG 3013).

Physical Design

Physically, the MTG is a single stainless-steel instrument with a standard diameter of 2” (other custom variations of probe diameter and materials are available.). The MTG requires one flange on the top of the tank and installs in sections. The standard configuration requires only two Intrinsically Safe electrical connections; one for power (12VDC) and one for communications (MODBUS RTU via RS 485). The MTG has fewer terminations and potential failure points than other tank gauging systems using multiple instruments with multiple tank openings.

 

The MTG can be installed within or without a gauge well. When installed in a gauge well 6” or larger, there is enough room to perform manual hand lines or sampling. This allows the verification of all measured parameters for Volume by Hybrid (Level, Temperature, Density, & Water) or Hydrostatic Method (Mass, Density, & Water) from the same physical location and product media. This enables verification of the gauge calibration and accuracy in comparison to the known reference.

 

The MTG uses an O-ring seal flange at the tank top to allow continuous bottom referencing even if there is any tank bottom or roof movement. An optional (Manually read or remotely read) TBMI “Tank Bottom and roof Movement Indicator” is also available.

 

All MTG pipe sections and sensor housings are machined and measured to precisely determine the exact location of each sensor. Standard MTG sensors are highly accurate absolute pressure transducers with Class A, 100 Ohm Platinum, Four wire RTDs. Optional sensors and combinations are available.

Gauging Systems Inc. Leaders in Tank Gauging