1. MTG “Multi-function Tank Gauge”

2. MTG™ Theory of Operation
The MTG™ Multi-function Tank Gauge is based upon mass and temperature measurement. The MTG™ design eliminates problems with earlier mass technologies such as Bubblers, HTG (Hydrostatic Tank Gauge), and some other techniques utilizing nitrogen bubbles measured at multiple locations and multiplexed through one pressure transducer. These earlier technologies suffered problems due to the improper design of the product, not because they used mass based measurement.
MTG™ (Multi-function Tank Gauge) overcomes the problems with both reference point movement and temperature change that affects level devices. Some level devices claim to be non-obtrusive, however, to do net volume a temperature device is required. The MTG™ has no moving parts and uses only one tank entry for all measurements. In addition to mass, the MTG™ provides accurate level and temperature measurement.
The MTG™ Multi-function Tank Gauge is constructed of sensor, joint, and pipe sections assembled into a vertical probe assembly. The standard configuration includes up to six sensor units, consisting of both an accurate pressure and temperature sensor module located in each of the sensor units.
The probe is assembled and lowered into the tank from the top. A double O-ring seal in the slip flange allows the probe to sit on the tank floor. As the tank expands or contracts from normal emptying and filling the MTG™ remains bottom referenced.
Usually the sensor sections are spread evenly over the tank height. The first one is always located near the bottom and the last one is always in the vapor space of the tank. In some custom configurations the sensor location inside the liquid space may vary based upon the product or service application.
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3. MTG components Assembled MTG probe Installation kit Transmitter head Sensor assembly
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4. Where: D is the liquid density;
The MTG™ probe is a rigid stainless steel construction with each sensor position precisely located.
The differential value P1 – P6 (see figure 1 on page 2) can be presented as:
P1 – P6=D*H*g (1)
Where: D is the liquid density;
H is the height of the liquid column above the first sensor;
g is the local gravity constant.
Therefore the mass of the liquid above the first pressure sensor can be calculated as follows:
M=(P1 – P6)*S/g=D*H*S=D*V (2)
Where S is the average cross-section area of the tank given by the tank strapping table;
g is the gravity constant;
V is the resulting volume of the liquid above the first pressure sensor:
The pressure difference DP12= P1 - P2 gives the average density value D12 in the area between first and second sensors provided that the distance H12 between the corresponding pressure sensing points is precisely known:
D12=( P1 - P2)/g/H (3)
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5. The level of liquid L in the tank is calculated as follows:
The density layers between the rest of the sensors are calculated in the same way:
D23=( P2 – P3)/g/H (4)
D34=( P3 – P4)/g/H (5)
D45=( P4 – P5)/g/H (6)
The density values measured as per formulas 3 to 6 and temperature measurements taken in the same points along the tank height allow bulding a density distribution curve.
The level of liquid L in the tank is calculated as follows:
L= Hi + Pi/g/Di (7)
Where Hi is the location of the last sensor unit covered with liquid;
Pi is the pressure measurement taken from the last sensor unit covered with liquid;
Di is the current density value.
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6. MTG Multi-function Tank Gauge
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7. MTG Provides: Accurate LEVEL measurement MULTIPLE SPOT TEMPERATURES
MULTIPLE DENSITY STRATA
FREE WATER measurement
CONTENT OF WATER in product
2nd INTERFACE (Emulsion in crude)
CONTENT OF WATER in 2nd Interface
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8. MTG Also Provides: Accurate MASS measurement
Product VOLUME (by Level or Mass)
MASS (Leak Detection) SENSITIVITY
VAPOR PRESSURE
VAPOR TEMPERATURE
Level, Temperature, Density, Pressure, Movement, and Stratification ALARMS
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9. MTG provides uncommon expectations from a tank gauge
A payback from a tank gauge system
Accurate inventory measurement
Quantitative
Mass Volume and Level / Temperature Volume
No temperature effect on Mass Volume
Mass & Level Volume, provides us a gray area
Hydrocarbon emission loss on inventory
Qualitative
Ability to define product quality (Real time)
Specific gravity / density
Monitor for product density stratification
Alarm (Q.A. product quality)
Electrical savings, when to mix..
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10. MTG provides uncommon expectations from a tank gauge 2
Multi-point Temperature
Accuracy (Class A, Platinum, Four wire RTD’s)
Monitor for product temperature stratification
Alarm (over cooking)
Electrical savings, when to heat..
Water content in product
Do not pay for water in products received
Do not pay for the transportation of water on product shipped
Crude Oil, do not pay royalties on water produced
Utilization of tank assets
Automation of water draw-off
When to use demulsifiers in crude oil, Increasing through put (decreased settling time)
Eliminates waiting on lab analysis to view product quality
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11. MTG provides uncommon expectations from a tank gauge 3
Safety
Redundant sensors = redundant alarms
Mass, Pressure, Level, Temperature, etc. from four to six sensors.
Monitoring of Vapor pressure
Tank structural damage prevention
Over pressure, i.e., stuck pressure relief vent
Under pressure or vacuum
Regulation or monitoring of gas blanketing system
Reporting of hydrocarbon emission to environmental agencies
Internal loss inventory from emission analysis
Leak detection by mass
Certification pending on 0.9 GPH (Meets Tightness Testing)
Tank tightness testing (Legislation is pending)
Blocking in of each tank for 72 hour test per year
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12. MTG provides uncommon expectations from a tank gauge 4
Reduced cost of ownership
Installation
Installs in service (2 men, 2-4 hours on a 40 ft. tank)
MTG is bottom referenced and is not affected by product turbulence
MTG does not require a Stilling well or Standpipe
Does not require Slotting of Stilling well for accuracy
Does not require Calibration pins for accuracy
Does not interfere with gauge sampling
MTG requires a 3” or larger flange opening
MTG is Obtrusive technology, as is all inventory tank gauges
Radar gauges require two openings, i.e., one for radar and one for a Temperature average device (Obtrusive)
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13. MTG provides uncommon expectations from a tank gauge 5
Electrical / Conduit
Connection to one instrument, MTG Only
UL, CSA, CENELEC I.S. Approved, PTB approval pending
24Vdc or 12Vdc before I.S. barriers
Radio / Solar from gauge is Optional
MTG Instrument
MTG is Self calibration
Calibration is based upon product movement
MTG is Self Diagnostic
Diagnostics are provided on every poll of the MTG
Individual sensors can be viewed in raw engineering units in the maintenance mode from the host or remotely
The application does not stress or tax the technology used within the MTG (Pressure transducers & Four wire RTD’s)
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14. MTG provides uncommon expectations from a tank gauge 6
Reduced Maintenance
New system topology (10BASE-FL Ethernet)
Designed to reduce electrical surges or lightning
Design based upon commercial standards
Designed to increase throughput of data
Designed to communicate with end devices
Designed to allow for future expansion
Field interface composed of commercial off the shelf hardware (Ethernet Fiber Hub)
Instruments providing Self calibration and Self Diagnostics
Remote support via modem or internet
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15. Tank Hardware
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16. 10BASE-FL Topology
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17. BlueField™(Patent Pending)
NEW
BlueField™(Patent Pending)
The major cost in any tank gauging or tank farm automation project is the field wiring. Normally two-thirds (2/3) of the cost is on wire, conduit, electrical fitting, etc. The upgrade of older technology in the field is often delayed because of the capital money needed to replace the communications infastructure. This means the benefits are also delayed and cost you money..
Bluefield™ is a Communications Topology designed to 1) Reduce the cost cabling vs. conventional hardwire, 2) Increase the data throughput speed and reliability using commercial standards, 3) Provide electrical isolation to all field hardware (against power surges and lightning), and 4) Provide two-way communications from Intranet based servers or application users (Tank Gauge Software) all the way to the MTG™ Multi-function Tank Gauge (or other field devices).
The standards adapted for the Bluefield™ Topology are known by most MIS people and consist of the following: Win TG PRO™ Software based upon Microsoft™ Windows 2000 or XP Operating System and designed for .NET ready platform, Ethernet 10BASE-FL (Fiber Link) hubs and smart switches acting as the field interfaces, Commercial grade Fiber Optic cable run into the tank farm to the GSI E/TGI™ Enhanced Tank Gauge Interface (local display) or GSI E/RTU™ Enhanced Remote Terminal Unit (with Single or redundant TCP/IP addresses and 10BASE-FL connections). Communications to the MTG™ Multi-function Tank Gauge over Bluetooth™, i.e., Short distance (328 ft.), 2.4GHz radio communications (or hardwired). See GSI Product Bulletin 5150 on the Bluefield™ Topology. Limitations on the use of radio may apply, I.e., local testing of radio channels must be made with any frequency hopping radio’s on non licensed channels before serious consideration of the BlueTooth™ portion is made. The Ethernet 10BASE-FL backbone bus is still preferred with or without radio connectivity to the instrument.
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18. BlueField™
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19. Hard Wire Topology
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20. Gauging Systems Inc. (GSI)
Thank you!
Gauging Systems Inc. (GSI)
910 Industrial Blvd.
Sugar Land, Texas 77478
Phone:
Fax:
Under Construction
Copyright© 2002 Gauging Systems Inc.