Difference between revisions of "Cone bottoms for tanks"

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[[File:Cone_Calculator_grab.png|500px|thumb|right|Cone calculator. Source: Tony.]]
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Cone bottomed tanks facilitate accurate splitting of oil and water, oil and glycerol (if you [[Glycerol wash]]) or glycerol and biodiesel.
  
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The easiest way to generate the shape or development for a conical bottom is to use the calculator complied by Tony.  For security reasons this has to be located outside of the wiki, but it can be accessed via this link or via the forum menu …
  
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[[File:Cone_Calculator_grab.png|500px|thumb|right|Cone calculator: source Tony.]]
 
  
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[[File:Cone_bottom_tab.png‎]]
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[http://www.biopowered.co.uk/forum/tools/cone.php Biopowered cone calculator.]
  
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[[File:Conebottom1.png]]
 
  
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Use of the calculator should be self explanatory, but you will need to enter the following information.  Tank or drum diameter.  Required cone height or required cone angle and the outside diameter of the fitting you intend to use.  For these three parameters the calculator will provide all the dimensions to manufacture a cone.
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Forget the hole in the top for the time being so, to find length of sloping side ‘L’
 
  
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Base dia ‘D’ = 570mm (typical for a 205 litre steel drum, but check before proceeding)  hence base radius ‘R’ is half this = 285
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[[File:Conical_bottom_JamesRL.jpg‎|400px|thumb|left|Fabricated cone bottom.  Source: JamesRL.]]
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Desired angle ‘a’, say = 45°
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For any size cone where angla '''a''' is 45° L = Square root of 2 (1.414) x R
 
  
  
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To address the hole in the top, use the same formula but substitute the diameter of the fitting you want to use for the base diameter, say 30mm
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Before making a start with a metal cone it may be advantageous to check everything fits correctly by making a paper or card test cone, it could save you a great deal of time in the long run!
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Hence if  D = 30, R will = 15
 
  
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l = Square root 2 (1.414) x 15 = 21.21
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[[File:Cone_bottom_tab.png‎]]
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We are aiming for this shape to roll into the cone,
 
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[[File:Conebottom2.png]]
 
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so we need to know the angle between the two edges (b°).
 
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We’ve already calculated L, 403mm.
 
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The Included angle is simple to work out it's 180 x D / L
 
  
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Giving us 180 x 570 / 403 = 254.59°
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If required a tab can be added to the development to assist in assembly and welding.
  
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To fabricate a 60° cone draw a semi-circle with a radius equal to the finish diameter, for a steel drum that's 570mm.
 
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The hole at the apex is the same, use a radius the same as the finished diameter.
 
  
  
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[[File:Cone development.png]]
 
  
  
 
<gallery caption="Steps in producing a cone bottom" widths="400px" heights="500px" perrow="2" align="left">
 
<gallery caption="Steps in producing a cone bottom" widths="400px" heights="500px" perrow="2" align="left">
 
File:Conebottomphoto1 source rob-b.jpg|Blank for cone. Source: Rob-b
 
File:Conebottomphoto1 source rob-b.jpg|Blank for cone. Source: Rob-b
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File:Conebottomphoto2 source rob-b.jpg|Arc for cone cut from blank. Source: Rob-b
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File:Conebottomphoto2 source rob-b.jpg|Development for cone cut from blank. Source: Rob-b
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File:Conebottomphoto3 source rob-b.jpg|Arc formed to cone and tack welded Source: Rob-b
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File:Conebottomphoto3 source rob-b.jpg|Development formed to cone and tack welded Source: Rob-b
 
File:Conebottomphoto4 source rob-b.jpg|Finished cone with fitting welded to tank. Source: Rob-b
 
File:Conebottomphoto4 source rob-b.jpg|Finished cone with fitting welded to tank. Source: Rob-b
 
</gallery>
 
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Revision as of 22:13, 12 September 2012

Cone calculator. Source: Tony.

Cone bottomed tanks facilitate accurate splitting of oil and water, oil and glycerol (if you Glycerol wash) or glycerol and biodiesel.

The easiest way to generate the shape or development for a conical bottom is to use the calculator complied by Tony. For security reasons this has to be located outside of the wiki, but it can be accessed via this link or via the forum menu …


Biopowered cone calculator.


Use of the calculator should be self explanatory, but you will need to enter the following information. Tank or drum diameter. Required cone height or required cone angle and the outside diameter of the fitting you intend to use. For these three parameters the calculator will provide all the dimensions to manufacture a cone.


Fabricated cone bottom. Source: JamesRL.




















Before making a start with a metal cone it may be advantageous to check everything fits correctly by making a paper or card test cone, it could save you a great deal of time in the long run!

Cone bottom tab.png

If required a tab can be added to the development to assist in assembly and welding.



  • Steps in producing a cone bottom

  • Blank for cone. Source: Rob-b

  • Development for cone cut from blank. Source: Rob-b

  • Development formed to cone and tack welded Source: Rob-b

  • Finished cone with fitting welded to tank. Source: Rob-b

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