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Participant

Join Date: Mar 2010
Posts: 4

# tank weight calculation

03/20/2010 1:59 AM

May i know how to calculate the weight(kg) of empty tank which is 6m length,1.2m width,1.2m height & used of 6mmt ms plate for fabrication.

This discussion was "closed" on 03/29/2010 7:15 AM. No new comments are allowed.
Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 19986
#1

### Re: tank weight calculation

03/20/2010 3:30 AM

For each piece of plate that makes up the tank, W = lwtρ, where the variables mean weight, length, width, thickness, and density; all in compatible units. Then add up all the individual weights: Σpieces lwtρ.

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Participant

Join Date: Mar 2010
Posts: 4
#2

### Re: tank weight calculation

03/20/2010 5:08 AM

Thank you for your precious advice but do u mind to make it more clear by substitute with numbers accordingly in the equation .When i look into your equation,height(1.29m) is excluded !Doesn't required to add?

regards.

Guru

Join Date: May 2009
Location: Richland, WA, USA
Posts: 19986
#4

### Re: tank weight calculation

03/20/2010 4:27 PM

If a piece of plate is vertical, the height will be the same as either the length or width. If a plate is rolled into a cylinder, the circumference will the same as the length or width. No new terms need to be added to the formula; it is quite complete and general for plate shapes.

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Guru

Join Date: Jan 2007
Location: Centurion, South Africa
Posts: 3918
#3

### Re: tank weight calculation

03/20/2010 7:05 AM

Instead of having to think about every detail you can calculate the volume as outside - inside = lo x wo x ho - li x wi hi. The 3 outside dimensions can be measured easily.

and then multiply by the density.

Li (lengthy inside) can be taken as lo (length outside) - 2 x thickness of plate.

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Member

Join Date: Oct 2009
Posts: 5
#5

### Re: tank weight calculation

03/20/2010 11:59 PM

You need to find the amount of the material use to fabricate the tank(let say it is steel plate)

formular for calculate weight of standard steel are as following:

Square Plate=W(cm)*L(cm)*T(mm)*0.000785Kg

Round Plate =R(cm)*R(cm)*T(mm)*0.00247Kg

Case 1. Square tank

Weight are the total of 4 ea. of side plate plus 2 ea. of end plate

4*(120*600*6*0.000785)+2*(120*120*6*0.000785)

Case 2. Round tank

Weight are totle of 1 ea. circular square plus 2 ea. of round end plate

1*{(2*22/7*60)*600*6*0.000785}+2*(60*60*6*0.00247)

Note: This is the weight of pure tank not include welding weight or other accessories

you attach to the tank

Participant

Join Date: Mar 2010
Posts: 4
#6

### Re: tank weight calculation

03/21/2010 1:26 AM

Thnak u.

But according to your equation as below,

Square Plate=W(cm)*L(cm)*T(mm)*0.000785Kg

How did you get 0.000785kg? I believe for example if the tank is open at top side facing upward,the equation becomes from

4*(120*600*6*0.000785)+2*(120*120*6*0.000785)

to

3*(120*600*6*0.000785)+2*(120*120*6*0.000785)

Do you agree with me?PLs correct me if i am wrong.

Member

Join Date: Oct 2009
Posts: 5
#8

### Re: tank weight calculation

03/21/2010 8:54 PM

You are right if the tank are open on top,but I think tank should have all side.

The constant nunber I acquire from the steel industry weight calculation handbook which there are difference no. on difference shape of steel.

Guru

Join Date: May 2009
Location: Red Hook, New York (Mid-Hudson River Valley)
Posts: 4370
#7

### Re: tank weight calculation

03/21/2010 10:34 AM

Hello,

Many of you forgot to take into account the plate thickness of 6mm in your calculations. I'm assuming that there is only a bottom plate and the top is open.

Side Plates Vol. = 2* [6,000mm * (1,200mm - 6mm)] * 6mm = 85,968,000 mm^3

End PLates Vol. = 2 * [(1,200mm - 6 mm - 6mm) * (1,200mm - 6mm)] * 6mm

= 17,021,664 mm^3

Bottom Plate Vol. = 6,000mm * 1,200mm * 6mm = 43,200,000 mm^3

Sum Vol, of PL. = 146,189,664 mm^3 = 0.1461897m^3

Unit Weight of Rolled Steel = 7,929.2 kg/m^3

Therefore, the weight of the tank = 1,159.167 kg <<<ANS.>>>

Note: do to time constraints that I have presently, I have not had the chance check my own work,,,,someone please check it for accuracy!

Have a great day!

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Anonymous Poster
#9

### Re: tank weight calculation

03/22/2010 9:16 AM

I remember that 1 foot square of steel 1 inch thick weighs 40lbf, but I am old fashioned.

Anonymous Poster
#10

### Re: tank weight calculation

03/22/2010 10:50 AM

Weight =Total surface area of six sided tank X plate thickness X density of mild steel

or sum of surface area of each side of tank X plate thickness X density of mild steel

M.S. Plate thickness 6mm (0.006M) Mild Steel density - 7861.093 kg/cu.M

Participant

Join Date: Mar 2010
Posts: 4
#11

### Re: tank weight calculation

03/23/2010 1:29 AM

Million thanking you