Joining 2 rounded tanks ends

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dolickc
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Joining 2 rounded tanks ends

Post by dolickc » February 7th, 2017, 5:37 pm

Hi everybody! I'm looking to build my first RF and I have 2 propane tanks that I am getting ready to cut into. I would like to mate the smaller one as a FB to the larger one (CC) and am perplexed as to how to scribe and join the 2 rounded ends. I am also confused as to how to calculate this throat dimension to see if it works ok as per the calculator. Of course it would be simpler if I cut both ends off and used flat plat to join them but this expense is considerable if there is an easy way to utilize the already formed ends and just cut an opening in each.
Any advise please?

Thanks in advance,
Craig



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Re: Joining 2 rounded tanks ends

Post by ajfoxy » February 7th, 2017, 5:42 pm

:welcome:

I'm sure someone will come along shortly to give the why's and wherefore's in joining two rounded ends.


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Re: Joining 2 rounded tanks ends

Post by SAFETYHARBORREDNECK » February 7th, 2017, 8:05 pm

Here's what I did.BTW-what size tanks have you using?
13419080_1322897611058485_6692305384207256616_n.jpg
thumbnail_IMG_20160314_131903.jpg
thumbnail_IMG_20160314_131850.jpg
IMG_20160427_171645.jpg
IMG_20160428_122556.jpg
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Re: Joining 2 rounded tanks ends

Post by dolickc » February 7th, 2017, 10:36 pm

Well, I never thought to make the fire box like that. Interesting idea!
I have a 200 gal CC and I think the FB tank is 125 gal. Slightly smaller dia.

Craig



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Pete Mazz
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Re: Joining 2 rounded tanks ends

Post by Pete Mazz » February 8th, 2017, 4:30 am

You'll need to shrink the size of the FB anyway. Have you used the PitCalc? There's a link near the top of every page.


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Re: Joining 2 rounded tanks ends

Post by dolickc » February 8th, 2017, 10:55 am

Well, I never thought to make the fire box like that. Interesting idea!
I have a 200 gal CC and I think the FB tank is 125 gal. Slightly smaller dia.

Craig



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Re: Joining 2 rounded tanks ends

Post by dolickc » February 8th, 2017, 11:02 am

Pete Mazz, yes, I planned to chop one end off the FB and put a flat plate on it to build a door and this also will reduce the volume suitably as well. I didn't plan on using the complete tank as a FB but I am hoping not to have to chop both ends off the FB tank in order to join to the CC. I can see the advantage of a simple shape FB for joining however and would hate to screw up the cut on the CC.



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Re: Joining 2 rounded tanks ends

Post by SAFETYHARBORREDNECK » February 8th, 2017, 8:38 pm

dolickc wrote:Well, I never thought to make the fire box like that. Interesting idea!
I have a 200 gal CC and I think the FB tank is 125 gal. Slightly smaller dia. Craig
I can't find the other pic right now(with a larger pot),but we use the top of the FB to cook a pot of beans or whatnot on.
It gets pretty hot so when it begins to boil I use the bricks(I call them simmer stones) to slow down the boiling.
IMG_20160514_140930.jpg
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Re: Joining 2 rounded tanks ends

Post by dolickc » February 10th, 2017, 12:54 pm

I bet that top gets real hot! With my present cheapo Chargriller (the reason for the build) I keep a kettle of water on top of the FB so I can add hot water to my water pan. Other than my lack of capacity the other issue I have is that I struggle with getting good cook temps Yes, I live in the frozen north but even in the summer I just don't seem to get great heat transfer from the FB in to the CC. With your design how hot can you get the CC?
I have done a ton of mods to that little smoker of mine to seal it up and add mass to it to retain heat btw.



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Re: Joining 2 rounded tanks ends

Post by Rodcrafter » February 11th, 2017, 10:52 am

Like Pete said you have to cut the small tank since it is way too big for the FB. You may be able to find some scrap plate at your local welding shops. Just ask them about drops in the sizes you need. So you don't have to buy a whole sheet. There will still be other steel items that are going to be needed like angle iron for racks and slide rails expanded for grates and stack material. Then what ever you frame it with that being a trailer or legs. I say all that to try and encourage you not to make choices in the beginning of your build that will cause you trouble down the road.


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Re: Joining 2 rounded tanks ends

Post by ajfoxy » February 11th, 2017, 11:53 pm

:yth:
I reckon RC has built enough of them to know what works and what does not.


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Re: Joining 2 rounded tanks ends

Post by dolickc » February 12th, 2017, 12:52 am

Thanks for the input guys. I really appreciate it. I'll do some scrap hunting and see what I can find around town. Simplifying the build for my first one makes a lot of sense. I will need a bunch more materials than I have right now anyways and a bit more cutting isn't a big deal.
The setup that SAFETYHARBORREDNECK uses looks rather interesting but I think I would like to insulate the top of the FB and so a horizontal mounting still makes more sense I think. I'll chop off both ends of the smaller tank for the FB.
Thanks guys!
Craig



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Re: Joining 2 rounded tanks ends

Post by Pete Mazz » February 12th, 2017, 5:05 am

If you cut off the FB end of the CC you can use a single piece of sheet steel to cap off both tanks.


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Re: Joining 2 rounded tanks ends

Post by dolickc » February 13th, 2017, 12:50 am

Pete Mazz wrote:If you cut off the FB end of the CC you can use a single piece of sheet steel to cap off both tanks.
hmm, simplicity. Cool idea! thx.

c



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Re: Joining 2 rounded tanks ends

Post by p3ripperfw » February 20th, 2017, 8:24 pm

If it's your first build or you are not accustomed to figuring and making coping cuts I would do like Pete mentioned. Then you could use the bell end you cut off for a fire pit at home or a cowboy cooker or Santa Maria style grill.



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Re: Joining 2 rounded tanks ends

Post by dolickc » February 20th, 2017, 11:37 pm

yes, any number of good things can be made with the ends. I will move towards simplity. thanks p3ripperfw!



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