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#413659 - 07/09/05 04:22 AM More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Pablo Offline


Registered: 10/28/02
Posts: 46693
Loc: Duvall WA - Pacific NW USA
Just a light quiz.

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#413660 - 07/09/05 04:28 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Shannow Offline


Registered: 12/12/02
Posts: 26867
Loc: a prison island
I'd say gasoline, as it's got a reasonably well mixed gas space above it.

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#413661 - 07/09/05 04:43 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Pablo Offline


Registered: 10/28/02
Posts: 46693
Loc: Duvall WA - Pacific NW USA
That's what I answered for the reason you stated ....but I have my doubts. It's a bit tricky. The question didn't say more potential energy...and specifically said 1/2 tank....

BTW This question was on a BP hiring test.

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#413662 - 07/09/05 04:48 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Shannow Offline


Registered: 12/12/02
Posts: 26867
Loc: a prison island
I agree that the heavier oils carry more energy in the tank, just not sure that it can be made available without having a mixed gas phase.

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#413663 - 07/09/05 04:55 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Pablo Offline


Registered: 10/28/02
Posts: 46693
Loc: Duvall WA - Pacific NW USA
Some of the questions - I can really say BiTOG helped me!!

The flow and tank fill questions I found to be fun. The valving questions were sneaky, but eliminating the non-starters helped a lot.

The worst questions were the: watch a safety or other video - then due some math or other unrelated questions for an hour plus - then have questions specifically about the video content - but no fair using past knowledge!

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#413664 - 07/09/05 05:08 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
medic Offline


Registered: 02/28/03
Posts: 1734
Loc: Bradford, Commonwealth of Penn...
I really don't know too much about the properties of crude, but I have seen the videos on TV of the well catching on fire and burning.

I'm gonna have to answer diesel. The thought that diesel can move a vehicle so much more efficiently than gasoline lead me to his answer.

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#413665 - 07/09/05 05:11 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Drew99GT Offline


Registered: 10/11/02
Posts: 20764
Loc: Colorado Springs
Isn't gasoline the most volatile and therefore the most powerful? I hear people saying diesel has more BTUs but I've also heard that if you were to put gasoline in a diesel engine it would probably blow the cylinder head clean off.

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#413666 - 07/09/05 05:32 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Gary Allan Offline


Registered: 09/28/02
Posts: 39806
Loc: Pottstown, PA
Doesn't this need qualification?

I think that gasoline is volatile enough to not have enough % of O2 to support combustion (whatever the proper term for explosive limit is)

but 5 gallons of gasoline properly atomized with blow up a city block.

OTOH
A guy cutting up empty heating oil tanks (bulk) killed himself and blew the tanks sky high with his torch.

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#413667 - 07/09/05 06:43 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
acranox Offline


Registered: 04/17/03
Posts: 137
Loc: Massachusetts
diesel has about 10% more BTUs than gasoline. (about 125K for gasoline, and 140K for diesel, per gallon)
it looks like crude is actually slightly lower than diesel.
So the diesel has more potential energy than the others.
Diesel has a higher flash point, but a lower ignition point than gasoline.
I'd say the diesel has more explosive power.

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#413668 - 07/09/05 08:49 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Pablo Offline


Registered: 10/28/02
Posts: 46693
Loc: Duvall WA - Pacific NW USA
acranox - I am afraid you might be correct - it's the only question that's been nagging me and I'll bet lots of other folks got it wrong. The 1/2 tank thing and the word "explosive" is what tripped me up. If they said potential energy I would have gone diesel and thought long and hard on the crude....

Except one thing I didn't mention - these are rapid fire questions - VERY SHORT timed sections, with MANY questions....I'm drained right now.

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#413669 - 07/09/05 08:28 PM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Pablo Offline


Registered: 10/28/02
Posts: 46693
Loc: Duvall WA - Pacific NW USA
NOW if they did this by weight not volume - say 1000 pounds - what would the answer be?

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#413670 - 07/10/05 09:11 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Drew99GT Offline


Registered: 10/11/02
Posts: 20764
Loc: Colorado Springs
Gasoline?

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#413671 - 07/11/05 09:14 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
MolaKule Offline


Registered: 06/05/02
Posts: 14654
Loc: Midwest
Crude oil has more "Potential" energy available, with Diesel fuel next, but gasoline has more volatility and higher VAPOR Pressure, so I would have to say it has the greatest potential for explosiveness.

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#413672 - 07/11/05 09:29 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
Pablo Offline


Registered: 10/28/02
Posts: 46693
Loc: Duvall WA - Pacific NW USA
Mola - thanks for taking the time to answer.

As I stated above I chose gasoline so we agree - but the question was "What has the greatest explosive power?".....To me this is vague.

well one missed shouldn't kill me [Smile]

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#413673 - 07/11/05 09:32 AM Re: More explosive power - 1/2 storage tank of gasoline, diesel, crude oil?
MolaKule Offline


Registered: 06/05/02
Posts: 14654
Loc: Midwest
right. Since they said something about 1/2 tank, I think they were giving a clue as to vapor pressure and it's potential volatility as well.

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