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Why do we measure fuel density in the upper part of the fuel within the tank?

18/05/2012

Density measurement with the automated hydrometer from Franklin Fueling Systems is based on the simple and direct Buoyancy Principle, where you compare the distance between a product float and a density float.


As the density of the fuel changes this distance will increase or decrease in proportion to the change. The tank gauge receives this information from the probe and uses it to calculate and display the current density of the fuel.

Research

Density_Float
Franklin Fueling Systems investigated the typical vertical temperature profiles within fuel underground storage tanks at a number of service stations using our level probes which have 5 temperature sensors along the length of the probe, allowing readings of fuel temperatures within 5 different layers at any time. We successfully monitored temperature readings before and after deliveries in various climates throughout the year in all these layers.

Results
As a result of our research, we found out the vertical temperature spread across the fuel is very narrow, which means that the possible change in density, as a result of a temperature differential, between the top and bottom layers of fuel would be insignificant to immeasurable.

However, measuring density at the top layer, where the fuel is clean, is better than measuring density at the bottom layer because any inaccuracies due to contamination can be negated.

Franklin Fueling Systems products provide highly accurate multi-layer temperature measurements and are the most preferred solution for fuel density measurement in the market.

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Franklin Fueling Systems
3760 Marsh Road
Madison, Wisconsin 53718 USA

Phone: +1 (608) 838-8786

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