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Tank Gauging and Overfill Prevention etc.

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MTG Multi-function Tank Gauge
MTG Multi-function Tank Gauge

MTG Multi-function Tank Gauge Family

The MTG Multi-function Tank Gauge provides more information for Loss Control, Safety, Environmental, and Operations than any other tank gauge system ever developed.  It provides and exceeds data needed to meet a host of API Recommended Procedures or Standards for Overfill Protection, Rupture Monitoring (Over pressure & Vacuum), Product Quality (Sampling), Vapor Emissions Monitoring, Leak Detection, Product Stratification Monitoring for In-Tank Blending, Water Settling (Bleeding), etc. thus assuring payback on your investment.

The MTG provides more usable data from a single instrument than any tank gauge on the market. It is the most accurate tank gauge for Volume, Mass, average and multi-strata density, water content accurate level, multi-point and average temperature, and vapor pressure. An optional sensor is available for ambient pressure, ambient temperature, ambient 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.

Applications

The design of the MTG is highly adaptable, and can be manufactured to meet the needs of multiple applications. The MTG has been installed into various tanks worldwide:

  • Tank Heights ranging from 8’ (2.43m) to 265’ (80.77m)
  • Climates (Tropical, Polar, Dry, Mild, Continental)
  • Clean Products (Gasoline, JP, etc.)
  • Dirty Products (Crude Oil, Lubricants, etc.)

 

Overfill Protection, Rupture Protection, and Leak Detection

MOP 3006 Multi-function Overfill Protection

Overfill Protection – High-High, High, Low Level; Rupture Monitoring – Over pressure & Vacuum; Critical sensors –  Vapor and Bottom; Measurement – Volume, Mass, and Calculated Level.  Used in standalone or redundant gauge configurations (MTG 3018, HTP 3055). See API 2350 Overfill Protection.

 

Volume Tank Gauging, Product Quality, Rupture Protection, and Leak Detection

MTG 3012 Multi-function Tank Gauge (Standard)

The most accurate tank gauge in the world for product Quantity and Quality Provides the following: Volume (TOV, GOV, GSV, & NSV), Mass (Product Head Mass, Product Heel Mass, Product Mass, Product Apparent Mass in Air, Mass Above Bottom Sensor, Mass Below Bottom Sensor, & Total Liquid Mass), Level, Multi-point spot temperature, Average temperature, Multi-strata density, Average product density, Total water (Free, Emulsified, & Entrained), Vapor Pressure, Vapor Temperature, Vapor Density, Flow Rate (Volume & Mass). Optional: TBMI “Tank Bottom / Roof Movement Indicator”.

Loss Control – Mass sensitivity for Unauthorized Movement (Leak detection, Theft, Improper line-ups, etc.), Product Quality (Real time sampling Top, Middle, Bottom). Optional: MTG 3013 with Ambient Sensor (Pressure, Temperature, & Density) for Vapor Emissions Monitoring, Gas Blanket Monitoring, Pressure Relief Vent Monitoring, Optional: HLAS 4100, MOP 3006, or MTG 3018 for Overfill Protection.

For tanks open to atmosphere, the vapor sensor allows for measurement of all parameters for CSTh Shell Temperature Correction Factor, FRA Floating Roof Adjustment, and GSV Gross Observed Volume (GSV, NSV, WIV).

Note: NSV cannot be measured by any gauge for products that have mechanical impurities (Sediment). The mechanical impurities should be entered using a lab result. We do GSV, taking into account entrained water. This is equal to NSV for products with no mechanical impurities

MTG LD 3012 Leak Detection

The MTG 3012 is configured for maximum MASS sensitivity for Unauthorized Movement (improper line-ups, theft, etc.). In use on critical process tanks that can’t afford to leak.

MTG IG 3012 Inverse Gauge

The MTG 3012 is configured for applications where the majority of the liquid is water. This could include: Settling tanks, Gun barrel tanks, Separators, etc.; Where there is 50% of water or less, using a standard MTG 3012 is recommended.

 

Add Vapor Emission Monitoring

MTG 3013 Multi-function Tank Gauge with Ambient Sensor

The MTG 3013 is configured with an Ambient Sensor for Vapor emission monitoring, PRV monitoring, or Gas blanket monitoring. For tanks not open to atmosphere, the ambient sensor allows for measurement of all parameters for CSTh Shell Temperature Correction Factor, FRA Floating Roof Adjustment, and GSV Gross Observed Volume (GSV, NSV, WIV).

 

Add Critical Redundancy (Minimize potential MTTR)

MTG 3014 MTG 3012 with Critical Redundancy

Redundant critical sensors, Vapor Sensor & Bottom Sensor, to minimize the Mean Time To Repair, when added to a Standard MTG 3012.

MTG 3015

An MTG 3012 with both Ambient and Critical Redundancy Sensors.

 

Volume Tank Gauging, Product Quality, Rupture Protection, Leak Detection, Vapor Emission Monitoring, and Overfill Protection

MTG 3018 Redundant MTG 3012 & MOP 3006 Overfill Protection

Provides two completely independent gauges (MTG 3012 & MOP 3006) in one physical probe assembly. Each gauge has its own transmitter card and sensor array within the shared gauge housing, thus, only one tank top flange opening is required for mounting “Two” gauges. Each gauge uses independent signal and power sources within the system to maintain complete independence. Exceeds API 2350 Overfill Protection requirements.

Full MTG Redundancy within one probe

MTG 3024 Redundant Multi-function Tank Gauge

The MTG 3024 provides two completely independent MTG 3012 Multi-function Tank Gauges within one physical probe assembly. Each gauge has its own transmitter card assembly and sensor array within the shared gauge housing, thus, only one tank top flange opening is required for mounting “Two” gauges (with or without gauge well). Each gauge uses independent signal and power sources within the system to maintain complete independence. No shared components between gauges, e.g., Antenna, power supply, IS barriers, field wiring, communication topology, etc.

MTG 3024 VG Virtual Gauge Software

Provides the means of combining data from multiple MTG gauges (sensor arrays & transmitter cards) within one tank into one combined “Virtual” gauge. Using overlapping strata data from overlapping sensor arrays for extreme accuracy.

MTG-L Long (Three to six Redundant MTG’s within one probe)

A Redundant Multi-function Tank Gauge with 3 (36 Sensors) to 6 (72 Sensors) fully independent tank gauges within one physical probe assembly. The MTG-L alternates sensors per array and transmitter cards to avoid any critical probe failures. Applications include: Tall tanks, Salt domes, Marine tankers & FPSO’s, etc. (Note: The MTG-L was the first Redundant Tank Gauge ever built in 1998, for example, five redundant gauges in one probe using combined data to form one tank gauge in tanks 250’ (76.2m) in height).

MTG-XL Long Multi-Function Gauges (Fully independent MTG and Leak Detection, etc.)

A Redundant Multi-Function Tank Gauge with 3 (36 Sensors) to 6 (72 Sensors) fully independent tank gauges within one physical probe assembly. Example: Three or four fully independent sensor arrays and transmitter cards can be used for Volume Tank Gauging and another one or two sensor arrays and transmitter cards are used for Leak Detection. Each of the two or more sensor arrays and transmitter cards can be fully independent from each other or grouped, e.g., interface, communications topology, and host would also be independent.

NOTE: Other types of sensors for use within MTG configurations are available. Alternative probe materials are also available. Consult GSI with your application and tank needs.

 

For use with Level Gauges

MTP 3025 Multi-function Tank Probe

The MTP provides Multi-point spot temperature, Multi-strata density, and Total Water. Designed for superior inventory measurement when paired with level technology (Radar, Servo, Magnetostrictive, etc.).

 

Improvements in HTG Technology

HTP 3050 Hydrostatic Tank Probe, i.e., Mass Tank Gauge

Provides Mass, Spot temperature, and Density. A Hydrostatic Tank Probe uses four or five absolute pressure transducers and RTD’s installed within a probe from the top of the tank; no hot taps, valves, heat trace or tubing; Eliminates all common HTG errors due to physical design and installation.

HTP 3055 HTP 3050 Hydrostatic Tank Probe & MOP  3006 Overfill Protection

Redundant combination of the HTP 3050 “Hydrostatic Tank Probe” and MOP 3006 “Multi-function Overfill Protection” in one probe. Only one tank top flange entry required for two fully independent systems.

 

Temperature

TTP 3030 Tank Temperature Probe

Multi-point spot temperature probe using Class A, 100 Ohm Platinum RTD’s.  Six – Twelve per TTP, based upon tank height.

TLP 3035 Temperature Level Probe

Approximate Level given by two Pressure Transducers (bottom and vapor) and wetted RTD selection for Average Temperature or Individual spot RTD’s.  Multi-point spot temperature probe using Class A or DIN, Four wire, 100 Ohm Platinum RTD’s. Six – twelve per TTP, based upon tank height.

RTD’s and Thermowell’s

Combination Bi-Metal & RTD

Multi-point Spot Temperature Probe and Switch

 

Click Here to see the MTG Multi-function Tank Gauge Drawings