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Benefits of Automatic Tank Gauge

The Benefits of Automatic Tank Gauge With ongoing measurement of tank levels and temperature you can insure the integrity of your product while also preventing costly inve.

Automatic tank gauge (ATG) systems measure the levels of liquids inside tanks with the help of electronic probes. These probes consist of long rods that house certain number of sensors known as floats. The position of the floats informs the operator sitting at the ATG console about the amount of petroleum product present in the tank.

The Automatic Tank Gauge is engineered to provide the utmost in long, dependable, trouble free gauging. Censtar diesel tank level gauge can detect liquid level and temperature, automatic tank gauge systems has the advantages of both multi function and long life.

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Advantages Of Magnetostrictive Level Gauge

Magnetostrictive level gauge for high-precision cleaning requirements of the liquid level measurement, accuracy of 1mm, the latest product accuracy has been able to reach 0.1mm.

Can be applied to the boundary measurement between two different liquids. Magnetostrictive biggest advantage lies in the high resolution, can be done micron level. Explosion-proof intelligent electronic circuit design can calculate the volume

Magnetostrictive level gauge only movable parts for the float, maintenance is very low. Used in various types of storage tank level measurement environment adaptability and strong installation and other characteristics in short range measurement relative to the radar and other liquid level meter cost is very high, the function is also a lot.

The display has current, temperature, and interface display. This is the magnetostrictive level gauge can become today’s gas stations and other metering tank on the most commonly used one of the products.

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Float and Tape Automatic Tank Gauge

These instruments have been the liquid level measurement technique of the petroleum tank gauging market for over 90 years due to their simplicity, reliability and cost.

Float and tape automatic tank gauge solution consists selected for the appropriate tank type. The instrument provides a measurement to +/- 4 mm accuracy and tank side display that is suitable for inventory management to API specifications. If control room integration and volumetric calculations are required, a 2920 FTT automatic tank gauge transmitter is recommended with a 8500 STS for spot temperature measurement. The selection of the transmitter often depends on the required or existing field communications and protocols.

The automatic tank gauge FTTcombination is ATEX approved and is also able to provide optional contact outputs for triggering alarms or relays. If only an analog (4…20 mA) level output is required (without temperature) the 8200 COT can be used.

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Level Gauges Selection Guide

Level gauges are meters used to determine the level of a liquid in a fixed storage or process tank. The gauge is composed of several parts including head, float, measuring tape, bottom anchored bracket, guide wires, elbows, anchors, coupling, pipe support brackets, and pipework. Liquid level gauge calibration is used to ensure proper readings are obtained when using level gauges.

Level gauges have several advantages including durability for harsh environments, including the ability to withstand high pressure, temperature, and vibrations. They are easy to read from a distance and can be used in addition to a switch or alarm in a system. There is little maintenance required and all repairs can be done without disturbing the system. They can also be customized for extreme applications.

There are several basic types of level gauges. Examples include:

Tank level gauges – A tank level gauge is used in tank volume monitoring.

Fuel level gauges – A fuel level gauge provides a direct fuel level reading for vehicles and equipment. The two main parts of a fuel gauge are the sender and the gauge. The sender measures the fuel level in the tank and the gauge displays the level to the user. The sending unit measures the fuel once the float has dropped below a certain level. When the tank is full, the float is near the top and the wiper rests close to the grounded side. This means that the resistance is small and a relatively large amount of current passes through the sending unit back to the fuel gauge. As the gas level drops, the float also begins to sink and the wiper moves to increase the resistance and cause the amount of current sent back to the gauge to decrease. To watch an animation of this level system, click the image below.

Water level gauges – A water level gauge is used for measuring the rise and fall of water levels.

Mechanical level gauges – A mechanical level gauge monitors levels of underground storage tanks.

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Automatic tank gauge to grow your business

The automatic tank gauge provide comprehensive fuel site data for advanced fuel asset management.

Combining industry leading algorithms with enhanced security, real-time notification, and anywhere, anytime access, the automatic tank gauge keeps your site running and profitable.

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Working Principle

Apart from glass tube level gauges, transparent level gauges are always fitted with two plate transparent glasses between which the fluid is contained. The fluid level is indicated as the result of the different transparency of the two media and in some cases (for water steam), by conveying upwards on to the surface of separation (between liquid and gaseous substances) a source of light located at the back of the gauge, the rays of which are totally reflected down to the observer.

Applications

Transparent level gauges are suitable for almost all installations.

In fact they permit:

  • the use of mica shields or Polytrifluorochloroethylene shields to protect the glass from the corrosive action of the process fluid
  • the observation of interface
  • the observation of the liquid colour

This instrument consists of a metal body, machined to have an internal chamber and one or more front windows (on each side of the gauge). On each window a special high resistance plate transparent glass is applied with sealing joint and metal cover plate hold by bolts and nuts.

The chamber is connected to vessel with cross fittings and flanged, threaded or welded ends. Usually, between the instrument and its connecting ends, valves are fitted to consent shut-off piping and to disassemble the level gauge without to empty the vessel. Drain valves can also be fitted to cross fittings device.

To avoid leakage in case of glass breakage, safety ball-check device can be provided in cross-fittings or shut-off valves. This kind of indicator is suitable for water/steam. To protect glass surfaces from corrosive action of the process fluid, Transparent Level Gauges can be fitted with Mica shields or Polytrifluorochloroethilene shields. This kind of indicator is suitable for liquids colorless and very fluid.

In some case (i.e. for water / steam) the best reading is obtained by conveying upwards on the surface of separation (liquid/steam or vapor interface), a source of light, located on the back of the gauge, the rays of which are totally reflected down to the observer.

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A compact, intelligent and reliable automatic tank gauge

As automatic tank gauge has evolved, the series servo level gauge has become an industrial standard all over the world. Very reliable, versatile and accurate automatic tank gauge with a minimum of moving parts, meeting all international standards, regulations and recommendations.

The multi-functional instrument is modularly constructed. The servo gauge is equipped with a Servo Auto Test feature which further increases the safety integrity of the servo and increases the diagnostic coverage. That means that the Servo can be used in overfi ll protection loops to prevent spillage. What is unique about this SIL-2 solution is the fact that all installed servo gauge worldwide can be simply loaded with a software add-on that allows it to be used in SIL-2 safety rated loops. The increased diagnostics in the gauge will detect failures inside the gauge or in the application and report this to higher level systems for further action. With the added diagnostics, the safety prooftest interval can be extended to 5 years.

This will signifi cantly bring down the operational cost compared to other solutions that require a proof test to be carried out every year. The Servo level gauge has a SFF (Safe Failure Fraction) > 90% which allows it to be used in SIL-2 safety loops. If used in redundant confi guration, the servo automatic tank gauge can be used in SIL-3 rated loops.

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Used a combination of advanced tank terminal automation system

We offer a complete range of measurement and metering systems designed and built at our UK headquarters. These systems universally supply dynamic real-time data acquisition through our web platform.

Our suite of automation solutions uses leading edge technologies and is modular in design. Our tank terminal automation systems use truly open technologies and are able to integrate virtually any instrumentation using vendor specific propriatary protocols or industry standard interfaces.

Our core products can be tailored to meet the exact requirements of the end user and we offer a range of tank terminal automation systems and automatic tank gauge to meet your requirements, language and budget.

Our platform has now been adopted as the standard in Terminal Automation by over 150 distribution terminals globally who are benefitting from universal access and control of their key sites via our web based systems.

From refinery operator through to fuel oil distributor European Automation Projects has the solution for all your measuring and metering requirements.

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How reflex level gauges work

Level gauges are also extremely flexible when it comes to combining more than one gauge section that allows for extended viewing areas. In addition, reflex level gauges may be applied in numerous applications to include feed water heaters, deaerators, boiler drums, and other types of tanks.

For a reflex level gauge, within the recess of a liquid chamber and behind a single piece of glass, is the liquid column that clamps down onto the gauge body. This glass is flat on the outside and on the inside has a series of prism grooves that face the vapor and liquid space. Based on whether light enters the vapor or liquid space, it is reflected or absorbed, respectively.

Once light encounters a groove’s surface within the vapor space it reflects to the surface of the grooves on the opposite side, followed by reflecting completely back to the observation direction. During the liquid phase, light is absorbed, which creates one display for the area that is covered by liquid and another display for the area located above the liquid.

Using the prism glass, a reflex level gauge accurately measures liquid inside the vessel. When light hits the glass where there is no liquid, the prism reflects the light directly out of the gauge. Known as the “dry” area, a silver color is displayed while the “wet” part is displayed in black. The contrasting colors create a clear delineation line that makes it easy to view the measurement.

The composition and design of a transparent level gauge is unique. This gauge is nontubular and fitted with two plate transparent glasses with liquid in between. By different transparency of two media, the level of liquid is indicated. At the back of the transparent level gauge is a light source with rays reflecting down to the observer making it possible to read or estimate the measurement. For most installations, a transparent level gauge is appropriate.

Level gauges provide a number of benefits that are industry-specific. To ensure that your company takes full advantage of the benefits, it is important to consider only the highest quality gauges. By working with a manufacturer that has specialized expertise in producing level gauges you have full assurance of enjoying optimal performance and reliability.

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Technology Selection for Automatic Tank Gauge and Overfill Prevention Systems

There is a common misconception that the level measurement instrumentation used in the automatic tank gauge system and overfill prevention system (OPS) on bulk liquid storage tanks must be based on different technologies.

This paper explains that technology diversification is not a requirement of the relevant industry safety standards, and that there are certain advantages to selecting the same technology for both systems. It describes why radar has become the dominant technology in such applications, with new installations often including two radar level gauges to provide both level and independent overfill prevention measurements. The paper also describes how the latest “2-in-1” technology enables a single radar gauge to be used for both level measurement and overfill prevention purposes, in compliance with industry standards, and how this allows for cost-efficient safety upgrades on existing tanks.

The owners and managers of bulk liquid storage facilities depend on accurate and reliable level measurement instrumentation within both their automatic tank gauge and their OPS. With tanks often storing materials that are hazardous, flammable, or explosive, an overfill can lead to injuries or even deaths, significant damage to assets, and extensive environmental harm. A company’s reputation can be seriously affected, while the cost of such incidents can sometimes be measured in billions of dollars.

It is therefore essential for companies storing hazardous materials to invest in a robust OPS that is compliant with current industry safety standards. IEC 61511 sets out best safety practices for implementing a modern OPS in the process industry. In addition, API 2350 addresses the minimum requirements to comply with modern best practices in the specific application of non-pressurized above-ground large petroleum storage tanks.

OPS can be either manual or automatic. Manual systems are regarded as being easier to implement and less complex, with lower initial costs. They typically consist of a level sensor or switch that transmits an audio-visual alarm to an operator, notifying them to take appropriate action, such as manually opening or shutting off a valve to prevent an overfill. However, the risk reduction factor of manual systems is limited and there is a strong trend towards replacing them with automatic systems, which can achieve higher risk reduction factors, shorter response times, and a reduced workload for operators. In bulk liquid storage tanks, automatic OPS typically consist of a level sensor, a logic solver, and a final control element in the form of actuated valve technology.

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