Graueradler
Pattern Altitude
Every month's end, when we stick the tanks, we end up about 200 gallons short on 100LL. Jet A comes out OK, usually a little positive. These are 10,000 gallon horizontal cylindrical tanks. We top off the trucks so we know how much is in them and then stick the tanks to determine how much is in them. We are using fuel finder paste on the side of the stick so we are getting a good distinct line that doesn't creep/wick. We've put security devices on the truck sumps and collected data on the truck for a month sticking it at COB and first thing the next morning without any anomaly. We bungled data collection on the storage tank looking for evaporation. We should get good data there this month (sticking it immediately after filling the truck and immediately before filling the truck the next time through out the month). Is it possible to have this much evaporation? The tank is normally less than half full so it contains a lot of air and has an unrestricted vent. It would breath a lot with day/night temperature changes. We are getting good agreement between the truck totalizer meter and billed volume. Yet everytime, we start with begining of the month inventory, adjust for volume bought and sold to determine an expected inventory and come up with an actual inventory about 200 gal less than expected. The sales meter calibration has been checked and the meter is very accurate.
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