Simple Torque Calculation for Belt Conveyor

**simhup** · 28th June 2005, 6:17

hi...

i need a simple (or estimate) formula to calculate torque (to turn)for belt conveyor application based on belt length, overall load, belt speed, pully drum diameter, and incline angle.

As these are the standard information available at site and I don't have any calculating tools available.

Thanks!

Dave Miller · 28th June 2005, 23:31

Dear Sir,

Formulae for Horsepower are available from NIBA, CEMA, RMA, and ISO. Once you have the Horsepower requirement, it is a simple calculation to develop torque requirements.

If you do not haved access to any of these sources, you may contact me via e-mail for the formulae set.

Regards,

Lawrence K. Nordell · 28th June 2005, 23:40

There are many books that fully cover your subject. Some are advertised on the internet as software ranging in cost from $50 USD and up. The technique is covered in this forum from books, standards, and authors such as : CEMA 1-5th editions, belt manufacturers manuals such as Goodyear, Contitech, Bridgestone, Standards such as Din 22101 or ISO 5048 and a single author's book by I. G. Mulani.

Gary Blenkhorn · 29th June 2005, 2:22

Dodge offers a simple program for designing small belt conveyors on their PT Wizard cd. The program will give you the HP and then you can calculate the torque as Dave suggests. The program is quite limited and is geared to Dodge products of course. But for short and simple conveyors it is a very nice program. Here's a link so you can check it out for yourself.

http://www.dodge-pt.com/pt_wizard/pt_wizard.html

There is also another very simple program that will calculate toque for you after you give it all the input data. "Engineering Power Tools" has a section on belt conveyors but again is very limited for conveyors. But it is a free download and it is also loaded with other very useful programs and information.

http://www.pwr-tools.com/

Good Luck

Gary Blenkhorn

Graham Spriggs · 4th August 2005, 11:16

Hello Simhup..

If I ever need to calculate approximate conveyor power, for example on simple in-plant inclined conveyors, I often do the following simple calculation.

Power = t/h x lift x 2.72 x 1.3 kW

From this you can easily calculate the torque, if you have the speed and pulley diameter from the following:

Torque = 9.55 x power divided by pulley rpm kN-m

When I was young and bright I could do the power one in my head by simlifying it to:

Power = t/h x lift x 3.5

Nice to use as a guide, especially if you don't have a calculator or even a pencil and paper on you. (Only works for inclined ones though)
Good luck
LSL Tekpro

Ishwar G Mulani · 31st October 2005, 4:49

Dear Simhup,

In case you wish to make approximate calculation for driving torque for the belt conveyor, you can refer to your national standard on belt conveyor or DIN or ISO, etc. This will enable you to get approximate value. The result will be approximate because the inputs you will be putting in to the formulae will be approximate in view of inadequate understanding.

Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916

Lawrence K. Nordell · 31st October 2005, 6:05

Good Job Graham,

I would add and correct your metric formulae:

Power (kW) = capacity (t/h) x lift (m) x 3.75 (not 3.5) /1000

The 3.75 includes a factor for drive efficiency (0.95) and some other small add-on factors for rolling drag and then divided by 1000 to get the units right. I checked it with BELTSTAT. It is close at > 10% slope.

Maybe, for really rough go, we could say 4.00 instead of 3.75 for those over 60. Then we get:

Power (kW) = capacity (t/h) x lift (m) x (4/1000) or .004

I hope I can remember this. Maybe give I'll do the tatoo up my sleeve. A birth mark from Graham.

Graham Spriggs · 1st November 2005, 12:06

Thank you Larry..
Now that I am over 60, I think I will also use a factor of 4 as you suggest...
LSL Tekpro

raj_ramesh · 14th November 2005, 15:45

Originally posted by simhup
hi...

i need a simple (or estimate) formula to calculate torque (to turn)for belt conveyor application based on belt length, overall load, belt speed, pully drum diameter, and incline angle.

As these are the standard information available at site and I don't have any calculating tools available.

Thanks!

nhondo · 9th March 2006, 2:46

Thank you all for the usefult tips, just a quick question also on the conveyor power that I usually use to do a quick calculation without allowances for the efficency as below:

Power (kW) = Lift (m) x tph x 1/367

Not sure how is this formulae compare to those posted ones.

Also anyone here using Helix Delta T? Is there any discrepancy between this program and BELTSTAT and how?

Thread: Simple Torque Calculation for Belt Conveyor

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Simple torque calculation for belt conveyor

Dave Miller

Consultant

ADM Consulting

Lawrence K. Nordell

President and CEO

Conveyor Dynamics, Inc., USA [eDir]

Gary Blenkhorn

President

Bulk Handling Technology Inc.

Belt Conveyor Calculations

Graham Spriggs

MD

LSL Tekpro

Ishwar G Mulani, B.Eng.

Technical Advisor Consultant

Ishwar Mulani

Lawrence K. Nordell

President and CEO

Conveyor Dynamics, Inc., USA [eDir]

Graham Spriggs

MD

LSL Tekpro

Re: Simple torque calculation for belt conveyor

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