as there will be...

arcboutant

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in the laund o'the lang spane.
comments please,
sent by a cousin from the USofA:-
we deliver about 4 million gallons in a 24-hour period
thru the pipeline. One day is diesel the next day is jet fuel, and gasoline,
regular and premium grades. We have 34-storage tanks here with a total capacity of 16,800,000 gallons.
Only buy or fill up your car or truck in the early morning when the ground
temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the gasoline,when it gets warmer gasoline expands, so buying in the afternoon or in the evening...your gallon is not exactly a gallon. In the petroleum business, the specific gravity, and the temperature of the gasoline, diesel and jet fuel, ethanol and other petroleum products plays an important role. A 1-degree rise in temperature is a big deal for this business. However, the service stations do not have temperature compensation at the pumps.
When you are filling up do not squeeze the trigger of the
nozzle to a fast mode. If you look, you will see that the trigger has three (3)
stages: low, middle, and high. In slow mode, you should be pumping on low speed,thereby minimizing the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fast rate, some of the liquid that goes to your tank becomes vapor. Those vapors are being sucked up and back into the underground storage tank so you are getting less worth for your money.
One of the most important tips is to fill up when your gas tank is HALF FULL or HALF EMPTY. The
reason for this is, the more gas you have in your tank the less air occupying
its empty space. Gasoline evaporates faster than you can imagine. Gasoline
storage tanks have an internal floating roof. This roof serves as zero clearance between the gas and the atmosphere, so it minimizes the evaporation. Unlike service stations, here where I work, every truck that we load is temperature compensated so that every gallon is actually the exact amount.Another reminder, if there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill up--most likely the gasoline is being stirred up as the gas is being delivered, and you might pick up some of the dirt that normally settles on the bottom...
 
Vapour generation is a product of liquid flashpoint, ambient temperature and surface area principally - with turbulance contributing less. :rob

....and let's face it - how much variation will there be in underground tanks during a day (or night)?

Load of sh1te, by the sounds of things............ :augie

as for the "air gap - floating roof" bit .....................

"This roof serves as zero clearance between the gas and the atmosphere, so it minimizes the evaporation. "

the only thing that will prevent evaporation at a steady temperature, is increasing pressure - not a feckin' air gap (or lack of)



Al :D
 
sent by a cousin from the USofA:-

Dear Cuzzin Arc-boot-ant,

How is you in Scotchland. We is good heaer but sumthin is not rite abowt gasoleen...

Uncle Leroy sez helo


redneck_mentor.jpg
 
Some of it rings true as part of my job is to go and look at fuel farms.

Temperature does make a difference if you're supplied in volume and then measure it by weight. Or vice-versa, that's specific gravity for you.

Floating roof - for fire supression, as if there's no oxygen present how's it going to burn?

Possible that the fuel stirring up etc, on aircraft fuel farms the fuel has to settle for approx 24 hours however it's delivered, to make sure that water etc settles out.

Loads of multiple and single product pipelines cross the UK. That's why Buncefield was inconvenient, and not a fuel supply disaster.
 
Have some experience of metering oil and gas being in the offshore industry and whilst I agree that some of these things can make small differences they all add up to 2/3rds of 3/5ths of jack sh1t when you drive a 5 litre V8 SUV
 
never been convinced by this sort of arguement, once you get below a certain ground level the temperature becomes surprisingly constant above the surface temp, regardless of surface temp (with the exception of extremes IE -25 surface temps) , so taking the logic of the statement that would mean the fuel would become more dense regardless of the time of day.

but at the end of the day the amount of fuel your putting in your car/ bike any variation in temp/density isn't going to make that much of a difference. probably find the accuracy of the pump deliverly system will have more of an effect on the amount of fuel you get.

just my 2p worth
 
Have some experience of metering oil and gas being in the offshore industry and whilst I agree that some of these things can make small differences they all add up to 2/3rds of 3/5ths of jack sh1t when you drive a 5 litre V8 SUV

:confused:

Al :nenau
 


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