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.

This article comes from varec edit released

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.

This article comes from globalspec edit released

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.

This article comes from gilbarco edit released

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.

This article comes from wermac edit released

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.

This article comes from tgiitalia edit released