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Old 01-31-2009, 03:41 AM   #1
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floating a fishing platform with 250 gal. propane tanks


Im building a fishing platform that is 21ft. long and 12ft. wide with 7ft elevated deck on it. I have access to 250 gal. propane tanks. So my question is how many will it take to float 10,000 lbs. If anyone can help me calculate how many it will take i would sure appreciate it!

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Old 01-31-2009, 08:38 AM   #2
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floating a fishing platform with 250 gal. propane tanks


You need to calculate the weight of the deck first. Then take the weight of the 250 gallon tank and subtact 2000# from it. That negative number is the approximate amount of flotation provided by each tank.

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Old 01-31-2009, 09:07 AM   #3
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floating a fishing platform with 250 gal. propane tanks


Ayuh,...

Each Gallon of displaced water will float about 8lbs.....

Personally,....
I'd use 55gal. Plastic Drums,+ stuff as Many as Possible under it.....

The Plastic Drums weigh less than steel tanks, Don't Rust,+ are much Cheaper....

By using More floation than is absolutely Necessary, insures that it don't Sink when some of the floation is compromised...
Which Will Happen,... Eventually.....

Last edited by Bondo; 01-31-2009 at 04:30 PM. Reason: Editted to reflect the brain fart
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Old 01-31-2009, 04:15 PM   #4
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floating a fishing platform with 250 gal. propane tanks


The weight of a US gallon of water is about 8.3 lbs. To support 10,000 lbs you will have to displace 10k/8.3=1205 gallons of water!
For your tanks to float half way out of the water, use a total of 2400 US gallons in total tank volume!
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Old 01-31-2009, 04:32 PM   #5
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floating a fishing platform with 250 gal. propane tanks


Doh! Double post.
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Old 01-31-2009, 04:32 PM   #6
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floating a fishing platform with 250 gal. propane tanks


Does US water weigh more than, say, Ethiopian water?
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Old 01-31-2009, 04:36 PM   #7
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floating a fishing platform with 250 gal. propane tanks


Ayuh,...

You're Absolutely Right Wildie,...

I edited my post to Fix it...
I was thinking of Cubic Foot of course, which is about 60lbs buoyancy...

21ft. long and 12ft. wide
That would be 6 runs of 7 barrels each,.... That's about 2300 gallons...
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Old 01-31-2009, 04:40 PM   #8
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floating a fishing platform with 250 gal. propane tanks


Quote:
Does US water weigh more than, say, Ethiopian water?
Ayuh,... I donno about that,...
But,..
Did you know a Steel tank Full of Freshwater will Float in the Ocean,..??
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Old 01-31-2009, 04:59 PM   #9
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floating a fishing platform with 250 gal. propane tanks


Don't forget about the weight of the tanks, the weight of the people, the weight of the grill and charcoal and the fish they will catch. - At least 6 to 8 tanks unless you have inflated the deck weight.
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Old 01-31-2009, 05:04 PM   #10
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floating a fishing platform with 250 gal. propane tanks


If it wouldn't, there would be no life on Earth as we know it. (It would depend upon the size and composition of the tank, technically).
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Old 01-31-2009, 06:10 PM   #11
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floating a fishing platform with 250 gal. propane tanks


The weight of a gallon will depend on temp. if you really want to get technical about it.Ethiopian water would probably weigh less.
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Old 01-31-2009, 09:51 PM   #12
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floating a fishing platform with 250 gal. propane tanks


If the Ethiopians use imperial gallons instead of US gallons then the Ethiopian gallon will weigh 10 pounds, definitely more than US.
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Old 01-31-2009, 11:01 PM   #13
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floating a fishing platform with 250 gal. propane tanks


Freshwater, assuming it is relatively free of 'too many pollutants' (good luck finding any 'PURE WATER' - since greedy, moneygrubbing industries have polluted about all of it on the planet), is nearly always listed at 8.33 lbs. per gallon. However, according to my 'very accurate scales', a single (U.S.) gallon of 'freshwater' weighs-in at 8.44 lbs. per gallon.
Saltwater ('pure saltwater': meaning 'purified- freshwater' with a synthetic sea salt completely mixed to a specific gravity of 1.022 (again, the 'recommended' specific gravity measurement is another argument altogether). However, this mixture (at 76 degrees Fahrenheit) is much heavier than Freshwater, coming in at 11.2 lbs per gallon; which is (obviously) 1.54 lbs per-gallon heavier.
And...

Even though nobody asked:

There is 231-cubic inches in a standard U.S. gallon. Therefore, to find the volume of air in a Cylinder would go back to the fun of Algebra and V= tt (as close as I cold get to the symbol for pi 3.14) * R (radius) squared * the hight of the cylinder divided by 231 would give you the volume few the cylinder portion of the propane tanks in cubic feet.

One cubic foot of saltwater is approx. 7.5 U.S. gallons and 'true' weight is determined by the 'exact' salinity (and in a minuscule way, the temperature & water purity, as well...

You don't really want to know how to figure out the volume of the domed portion of the cylinders, do you?

Ethiopian water would be worse than “Don't drink the water” Mexican water so would weigh more than US water depending on the amount of contaminates dissolved in it.

As for water in the US, the water that comes out of a modern sewage refinery plant is better (lack of contaminates, etc.) than 98% of the tap water in the country.

Other than being manufactured by combining hydrogen and oxygen ie. the Space Shuttle launching minus the solid boosters there is no such thing as “fresh water”. All of it's gone through something, so we call it “Dino Pee.”



So, I'm the President and Technical Director of an environmental organization and figure out things like all of the fresh water entering Tampa Bay and have to allow for evaporation.

It ain't rocket science unless your building rockets!
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Old 02-01-2009, 02:35 AM   #14
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floating a fishing platform with 250 gal. propane tanks


thanks guys i appreciate it, i was thinking 6 tanks which would give me 1500 gallons. i believe the deck will weigh with the tanks approximately around 7500lbs. which 6 tanks should float 12495lbs. so it will leave me with 4995lbs. to accomidate people, fish, gear, etc. By putting extra air in the tanks would that help float more? people have told me to fill them with foam. i think the sidewalls (5/16") of the tanks are rigid enough to withstand a impact from a small boat in the night or whatever kind of accident like that.
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Old 02-01-2009, 09:17 AM   #15
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floating a fishing platform with 250 gal. propane tanks


Quote:
By putting extra air in the tanks would that help float more? people have told me to fill them with foam.
Ayuh,...

Neither idea will increase the bouyancy,...

Actually,... It'll add Weight,+ lower the bouyancy...

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