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Old 08-11-2017, 06:27 AM #1
HWY36
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propane limit 100# tank

I have a 100 lb tank from open source steel that can hold 100 lbs of butane and be 80% full. If I switch to propane can I still fill it to a 100 lbs and be safe? The kid at Open Source Steel said yes but didn't sound confident in his assertion. Second opinion anyone?

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Old 08-11-2017, 09:40 AM #2
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Propane should be just over 8 grams per cubic inch. Butane is about damn close to 10 g/in^3.
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Old 08-11-2017, 02:25 PM #3
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I would double check the rated capacity versus actual capacity, because 100# capacity is typically based on water and butane has a specific gravity of .601, with propane at .585.

As LPG tanks can only be filled to 80% capacity, that means the 100# tank holds 80# of water, 48 lbs of butane, or 46.8 lbs propane.
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Old 08-11-2017, 05:50 PM #4
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Quote:
Originally Posted by Gray Wolf View Post
I would double check the rated capacity versus actual capacity, because 100# capacity is typically based on water and butane has a specific gravity of .601, with propane at .585.

As LPG tanks can only be filled to 80% capacity, that means the 100# tank holds 80# of water, 48 lbs of butane, or 46.8 lbs propane.
GW, This is from their website. The Q and A claims the tank is rated for 100lbs of butane with 80% safe capacity. Does this sound right? I don't want anything to go wrong wrong wrong! THX

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i have your 100lb solvent tank. what should the weight be of the tank when filled. what is your guys recommendation for amount of solvent in them.
Our 100lbs solven tanks are rated for 100lbs of N-Butane storage and 80% safe capacity.*
Your 100lb solvent tank is a height of only 19 in? Is that a typo?
Yes, Sorry about that! The height is*55 inches
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Old 08-11-2017, 06:25 PM #5
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Originally Posted by HWY36 View Post
GW, This is from their website. The Q and A claims the tank is rated for 100lbs of butane with 80% safe capacity. Does this sound right? I don't want anything to go wrong wrong wrong! THX

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Ask a Question
i have your 100lb solvent tank. what should the weight be of the tank when filled. what is your guys recommendation for amount of solvent in them.
Our 100lbs solven tanks are rated for 100lbs of N-Butane storage and 80% safe capacity.*
Your 100lb solvent tank is a height of only 19 in? Is that a typo?
Yes, Sorry about that! The height is*55 inches
What are the dimensions? 55" tall X what diameter?

100#/.8= 125#

125#/ (.0361X.601)= 5761 in3

5761 in3 / 55" = 104 in2

Square root of (104 in2/.7854) =11.55" ostensible diameter

Is it that big?
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Old 08-11-2017, 11:12 PM #6
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Originally Posted by Gray Wolf View Post
What are the dimensions? 55" tall X what diameter?

100#/.8= 125#

125#/ (.0361X.601)= 5761 in3

5761 in3 / 55" = 104 in2

Square root of (104 in2/.7854) =11.55" ostensible diameter

Is it that big?
It's just shy of 12 inches (whatever that exactly means) according to the rep.
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Old 08-12-2017, 02:05 AM #7
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It's just shy of 12 inches (whatever that exactly means) according to the rep.
A 12" dia tank 55" long would hold 100# butane at 80% fill.

It would hold exactly the same amount of propane, but would only weigh 97.3#.
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Old 08-12-2017, 07:44 PM #8
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Originally Posted by Gray Wolf View Post
A 12" dia tank 55" long would hold 100# butane at 80% fill.

It would hold exactly the same amount of propane, but would only weigh 97.3#.
Thank you sir. May I ask how to do the math to arrive at the numbers?
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Old 08-12-2017, 09:00 PM #9
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Originally Posted by HWY36 View Post
Thank you sir. May I ask how to do the math to arrive at the numbers?
The specific gravity of n-Butane is .601 and n-Propane is .585.

(100#/.601) X .585 = 97.3#
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Believing is seeing and ignorance is bliss until it bites you in the ass!

Fervor is the weapon of the impotent. The harder the sell, the poorer the product.

Alas, my ignorance abounds; the more I've learned, the less I know that I know..........

Thou shalt seek and respect the opinions of operators, even unto the third helper, for theirs is a wisdom unknown to technicrats.

Wise men learn more from fools, than fools from wise men.

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Old 11-10-2017, 09:06 PM #10
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Originally Posted by Gray Wolf View Post
The specific gravity of n-Butane is .601 and n-Propane is .585.

(100#/.601) X .585 = 97.3#
Does anyone know why propane has a specific gravity of .585 and both .495 on the engineers toolbox sight? It's the only gas on there with two different specific gravity.
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