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Life Time of V-Belt

02/28/2012 8:08 PM

I want to know, how to calculation lif time of V-belt in a system like blower ?

Fan Type Centrifugal ( backward inclined blade ), SWSI c/w Box,, Motor 10kW,

V-BELT;SPB2240, 5 rows. Pulley Motor 200mmD, Pulley Blower 280mmD, ?Tq

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#1

Re: Life Time of V-Belt

02/28/2012 8:24 PM

What did the seller of the equipment say when you asked him how to do this???

He might be more familiar with the operating environment than we are.

Rhetorical question, to be sure.

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#2

Re: Life Time of V-Belt

02/28/2012 9:10 PM

You should ask to the vendor of v-belt. To extend its life, you should set the belt tension according to the recommended tension, otherwise the slippage / overstress of the belt will shorten its life (and also bearings of your blower/motor).

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#3
In reply to #2

Re: Life Time of V-Belt

02/28/2012 9:24 PM

when i was working here, thats blower have installed, and i did'nt know about vendor recomended.

that blower is very criticals, and belt as transmision always broken after 3 or 4 month, i want try to extend life time, with don't distrubs process production that blower resulted know.

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#7
In reply to #3

Re: Life Time of V-Belt

02/29/2012 3:13 AM

It sounds like the lifetime of the belt is 3-4 months, then.

Have you actually picked up the telephone and talked to someone at the blower manufacturers or did you think it would be better to ask a bunch of random people instead to see if they new better?

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#10
In reply to #3

Re: Life Time of V-Belt

02/29/2012 7:49 AM

dedek

The belts should have been selected to match the motor. There are different types of belting material that have different lives.

I suggest going to a website of a manufacturer of belting and sheaves. Some of these websites have engineering calculations for sizing of belts. you will need to know things like motor RPM, sheave (pulley) ratio, etc.

If you don't have the background to do that, you should contact a local sales rep for the v-belts. If you're buying from a local store, get the name of the manufacturer from the packaging material and find their website.

You may have an alignment problem, a belt tension problem, wrong type of belting material, wrong number of belts, exposure to sunlight, chemicals, etc.

good luck.

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#4

Re: Life Time of V-Belt

02/28/2012 9:37 PM

No, no, no. We are supposed to come up with a complete, preposterously precise, arcane equation that generates a Gaussian distributed value between 100 and 50,000 hours of operation to exonerate the use of this product. Knowing the belt tension, variability of the load or composition of the belt material is obviously superfluous information to the cause. The alignment and surface condition of the pulleys do not matter. Obviously there is no belt tensioner so tension is red herring here.

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#5

Re: Life Time of V-Belt

02/28/2012 10:03 PM

From the picture, that drive is way too flimsy. No wonder its lifetime is low.

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#6

Re: Life Time of V-Belt

02/28/2012 11:23 PM

If you have followed all the installation procedures correctly, it lasts as long as it lasts. Belts are cheap compared to lost production, so have an extra one on hand at all times. Also MAKE SURE you are following correct installation procedures!

Trying to predict the lifetime of the belt is a fools errand.

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#8

Re: Life Time of V-Belt

02/29/2012 4:25 AM

5 rows of belts for 10kw is is unbelivable, and last only 3 or 4 months ????????

SPB belts are one of the good quality belts specifications. SPB section belts are suitable as good as normal C section belts.

From a good manufacturer's specifications, for 8 inch pitch dia of small pully running at 1750 RPM, one B section belt has capacity of 13.39 kw.

There seems some major mistake.

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#12
In reply to #8

Re: Life Time of V-Belt

02/29/2012 9:01 AM

Mr.Mukesh0861:::::therefore , I want find how came like that

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#16
In reply to #12

Re: Life Time of V-Belt

02/29/2012 9:20 PM

dedek,

You give all the relevent data, like motor rpm, blower required rpm, motor power and centre line distance between two shafts. Also see what is power requirement of your blower.

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#9

Re: Life Time of V-Belt

02/29/2012 5:38 AM

I hope there's a guard around that belt. I wouldn't like to get my uniform caught in it....

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#11

Re: Life Time of V-Belt

02/29/2012 8:45 AM

Does the motor run all the time?

Some possible info here:

http://www.pennbarry.com/engdocs/pdf/ED16002.pdf

If you don't have one installed, have you considered purchasing a soft starter? It would extend the life of both the motor and the belts substantially.

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#13

Re: Life Time of V-Belt

02/29/2012 12:55 PM

Why bother? Whether the belt breaks now or when you think it will, you will have to go through the same procedure of changing the belt.

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#14
In reply to #13

Re: Life Time of V-Belt

02/29/2012 1:33 PM

I agree.

just keep some spare belts around and change it when neededd.

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#15

Re: Life Time of V-Belt

02/29/2012 6:11 PM

If these are banded together I would go with a set of matched separate belts and double the pulley sizes...with a soft starter if you don't already have one...

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#17

Re: Life Time of V-Belt

03/01/2012 2:23 AM

All, thank U for all your suggest,

it is important to me, and i will try the correct steps for install my belting with same belt specification before, and i see what happen for the next.

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#18
In reply to #17

Re: Life Time of V-Belt

03/01/2012 3:43 AM

"when i was working here, thats blower have installed, and i did'nt know about vendor recomended."

Are you sure, the both pulleys are in alignment (parallel) within norm for that speed. OEM may not recommend vendor, they recommend type size and specification of pulleys and belts. It may be possible that pullies are worn out and not offering enough grip from sides and belt is touching & slipping at bottom. Also check whether belts correctly suit pulley design.

I suggest to replace both pulleys and all belts together, once from same manufacturer like Fenner, install and align as per their recommendation and see the life.

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#24
In reply to #18

Re: Life Time of V-Belt

03/03/2012 5:42 PM

GA for this answer. I would just like to stress always change the belts as a complete set for max lifespan

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#26
In reply to #17

Re: Life Time of V-Belt

01/10/2013 8:58 PM

It seems that the belt contact area over the pulley is not sufficient to transmit the torque. You can try increasing the diameter of both the pulleys maintaining the same ratio as now to keep the blower RPM same. This will reduce belt slip over the pulley and life will be enhanced.

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#19

Re: Life Time of V-Belt

03/01/2012 7:36 AM

Looking at your picture I would believe that you need a multi pulley and use three or four belts.

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#20

Re: Life Time of V-Belt

03/01/2012 7:56 AM

Belts should last longer than this. I agree with the others that the pulleys may be worn out. Use a straight edge and check the surfaces the belts ride on. Inspection gages are available for this as well. A V-belt should never bottom out in the groove and the gage will help show if the groove is worn to the point this can happen as well if they have worn sides. Can you post pictures of the failed belts? Then we can see the wear patterns on the sides of them. This will help indicate alignment issues.

Depending on your conditions you may consider a different type of v-belt. You can get raw edge as well as covered. Each has its own advantages. When getting new belts talk to the vendor. Tell them the history and what the working environment is. They should be able to help select the best choice. If you just call and say you want a certain belt they will be happy to sell it to you because that is what you asked for.

How are the bearings in the blower? Does the blower shaft turn freely? Failing bearings will increase the load on the belts and cause premature wear of the belts and pulleys.

Are the belts being installed as a set or one at a time as they fail. Used belts will have stretched some. Not replacing all of the belts places more if not all of the load on the new belt(s). So instead of spreading the load over 5 belts it is reduced to just 1 or 2. Sure the others are going around in circles but they are not really doing anything. One thing I do when changing out a set of belts is line up the writing on the belts such as the name of the manufacturer. This gives a reference to see if there is slippage. If, in your case, 3 of the belts stay lined up then 2 are slipping and not carrying their share of the load.

On single belt set-ups alignment can be a little off and still work ok. On multi-belt installations angular alignment becomes more critical as you place more load on just 1 or 2 belts and the rest do very little work. Be sure to check axial alignment relative to the groove the belt rides in and not the face of the pulleys. The wall thickness from the face to the groove is not always the same on the motor and the driven unit. You still check at the face but use a feeler gage or shim to bring the face of the thinner wall out to match the thicker wall if you use a straight edge to check axial alignment. If you use a string then use a steel rule or tape measure at the thinner pulley and check across the face of the thinner at both sides of the outer rim. If you are going through belts as fast as you say you are then a laser alignment tool would definitely be a justified purchase. Greatly simplifies alignment and speeds up the process.

Good Luck

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#21

Re: Life Time of V-Belt

03/01/2012 2:29 PM

There had been a lot of good information provided by the commentors. just do the process of ellimination what really causes the belt damage. Start with the basic like alignment, belt tension, pulley condition, load (check bearing), length of belt, foundation (especially the drive and blower are having different foundation.), try putting a base jackbolt to hold the drive and blower from moving in due the belt tension. Keep the pulley and belt clean. Before increasing the number of belts or changing belt type, using laser alignment, etc.

You may find a belt life calculator but it is not guarranted hence it only assume on an ideal working condition.

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#22

Re: Life Time of V-Belt

03/01/2012 2:38 PM

ps. it looks like you need to increase belt angle of wrap. Increase the pulleys diameter or install a belt tensioner. Also reduce the center distance (reduce belt lenght). base on the picture shown.

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#23

Re: Life Time of V-Belt

03/01/2012 3:58 PM

Use the Gates calculator, which is available on line.

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#25

Re: Life Time of V-Belt

01/09/2013 11:37 AM

Dear Mr. dedek,

!. Select Right Type of Belt B or C or D size, and ensure CORRECT GROOVES.

2. No. of Belts Required, should not be COMPRAMISED.

3. Use of Idlers to increase Belt/Pulley CONTACT AREA to avoid SLIPPAGE.

4. Correct Tension. Lesss Tension will result in Slippage.

5. If possible use one No. extra belt or next higher size, or both.

DHAYANANDHAN.S

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