Portable Marine Gasoline Fuel TankPressure and Temperature MeasurementsField Data ReviewDate: Oct 30th, 2009Prepared by:Mercury MarineMike TorgerudLocation(City, State)Fuel Source and TypeDateTime Fuel Temp (°F) Pressure (psi)9am10am11am12pm1pm2pm3pm4pm5pmProcedure:1. Fill tank to “safe fill” line on sideof tank with low octane fuel fromfilling station withunderground tanks2. Store in full sun (southern exposure), on black surface isolated from wind3. Record data with vent closed for 3 consecutive days (table below)Fuel Tank Measurements- Field Test“Fill tank during coolesttime of day/ night”CAUTION NOTE:(monitor pressure at fuel cap gage)Place a rag over cap or connection prior todisassembly if service is requiredDO NOT OPEN OR CONNECTIF PRESSURE EXCEEDS 5 PSINote-Photograph set-up andany temperatures/ pressuresexceeding 90°F or 5psi(document time/date of photo)Set-upDial PressureGaugeThermocouple Reader(measurement in gasolineat bottom of tank)3 gallon fuel tank(filled to “safe-fill”)Portable Marine GasolineFuel Tanks (3 and 6 gallon)Peak Gasoline Temperatures / PressuresMeasured October 26-29 2009113°F3.0 psi106°F4.0 psi(7.0rvp) *(11.5rvp)*(11.5rvp)** REID VAPOR PRESSURE (RVP) PER ASTM D4814 TABLE 4105°F6.0 psi108°F6.0 psi(11.5rvp)*Observations:- Gasoline volatility varies by region per ASTM 4814- Portable fuel tanks expand significantly when under pressure- Portable tank gasoline temperature exceedsambient air temperature by (13 to 23°F)Conclusions:- Gasoline within closed portable fuel tanks in the U.S. will exceed 108°F and 6psi- The above values were achieved with anestimated 11.5 rvp Florida fuel per“ASTM Seasonal and Geographic Volatility Classes (ASTM D4814 Table 4)”- Elastic nature of tank has an effect on resultant tank pressure due to increased volumeAppendixNorco, CASet-upAir(°F)3 gallon fuel tank(filled to “safe-fill”)* REID VAPOR PRESSURE (RVP) PER ASTM D4814 TABLE 4Test Location #1LocationGlendale, AZ 85305 (Lat/Lon: N 33° 32.350' W 112° 15.599' ) (Elevation: 1060 ft.)Fuel SourceChevron (Lat/Lon: N 33° 38.083' W 112° 15.277' )Type87 OctaneDate10/26/2009Fuel Temp (°F) Pressure (psi) Air Temp (°F) Humidity %Time9am75.4 0 76.5 1810am82.6 1 77.4 1811am91.8 2 78.6 1812pm97.4 3 79.1 181pm104.3 3.5 81.5 172pm105.4 4 82.2 173pm106.6 4 83.1 174pm101.6 3.5 82.4 175pm98.2 2.5 81.5 17Collapse duringDiurnal CoolingGlendale, ArizonaPeak PressurePeak TemperatureSet-up3 gallon fuel tank(filled to “safe-fill”)Test Location #2Panama City,FloridaSet-upPeak Fuel PressureRecorded 10/29/096 gallon fuel tank(filled to “safe-fill”)Test Location #35.096°5:00 PM5.5102°4:00 PM6.0105°3:00 PM6.5104°2:00 PM6.0100°1:00 PM5.591°12:00 PM4.082°11:00 AM2.075°10:00 AM1.069°9:00 AM0.562°8:00 AMPressure (PSI)Fuel Temp (F)TimeDay 410/29/09TR 2009-1829Peak FuelTemperatureRecorded 10/29/09KEY LARGO, FL.HESS FUEL STATION KEY LARGO87 OCTANE REGULAR FUEL10-26-09 CLEAR SUNNY DAYFUEL TEMPPSI9AM 82.6 1.510AM 95.0 3.011AM 100.4 3.012PM 104 5.01PM 104.4 5.02PM 108.4 6.03PM 108.4 6.04PM 107 5.05PM 104.8 5.0Key Largo,FloridaSet-upPressureGaugeThermocouple Reader(measurement in gasolineat bottom of tank)3 gallon fuel tank(filled to “safe-fill”)Peak ValuesRecorded 10/26/09Test Location #4