how many gallon tank?? help!!

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boredcpl

Feeder Fish
MFK Member
Aug 16, 2005
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lawrencburg,indiana
how can you figure how many gallons a hex tank is?? i have 2 hex tanks one around 20 or more and one around 40 or more..
 
Correct me if I am wrong, It has been a long time since school, but shouldn't you be plugging in the circumference instead of the radius? If I remember right a 3' wide 3' tall circular tank should hold around 150g, not 33g. I think the formula for the volume of a cylinder is hieght x [pi x (radius squared)], the volume of a hex should be close to the volume of a cylinder the same hieght.
 
complicated way: based on the measurements of the tank, construct a cube (on paper) and get the total volume. then obtain the volume for each triangular shape made between your tanks actual dimensions and your imaginary cube. Subtract the total of all your triangular volumes from the total volume of the cube. If i remember correctly from my days building speaker boxes, this should get you your total volume, from this point you mulitply that by the gallons per cubic foot(or inches) ratio, which i believe is approx. 7.45 gallons per cubic ft. Total volume of Hex tank X 7.45 = Total gallons.
(this is based on a formula used for caluclating airspace) its been awhile but i believe this is correct, but it has been awhile so dont bash me if im wrong..lol

Easy way (IMO): Fill up each tank a gallon at a time and dont lose count
 
guppy said:
Correct me if I am wrong, It has been a long time since school, but shouldn't you be plugging in the circumference instead of the radius? If I remember right a 3' wide 3' tall circular tank should hold around 150g, not 33g. I think the formula for the volume of a cylinder is hieght x [pi x (radius squared)], the volume of a hex should be close to the volume of a cylinder the same hieght.
Click to expand...

Ahh..yea i agree with Guppy, this should get you your approx. capacity as well.
 
islander671 said:
complicated way: based on the measurements of the tank, construct a cube (on paper) and get the total volume. then obtain the volume for each triangular shape made between your tanks actual dimensions and your imaginary cube. Subtract the total of all your triangular volumes from the total volume of the cube. If i remember correctly from my days building speaker boxes, this should get you your total volume, from this point you mulitply that by the gallons per cubic foot(or inches) ratio, which i believe is approx. 7.45 gallons per cubic ft. Total volume of Hex tank X 7.45 = Total gallons.
(this is based on a formula used for caluclating airspace) its been awhile but i believe this is correct, but it has been awhile so dont bash me if im wrong..lol

Easy way (IMO): Fill up each tank a gallon at a time and dont lose count
Click to expand...

oh by the way i think i probably shouldnt have used the word Cube (as in a perfect cube) but instead a 3d rectangular shape.
also if you wondering how to get the cubic volume of a triangular shape, just add an identical triangle onto the original. calculate the volume of the rectangular shape, then divide it by 2.
sorry if my terminology is off or sounds inaccurate, the highest math i took in highschool was Alg I. lol
 
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