Originally Posted by rushabh

I want to know that what is defination and difference between the design capacity, rated capacity, and average capacity for the bucket wheel type stacker cum reclimer handling the coal? Please give me some referance book that gives the definition. also tell me reference book for design the equipment.

Thanks and regards

rushabh shah

+919909027268

rushabh.shah@pmcprojects.com

The best sources to obtain this information are the manufacturers of the reclaimers themselves as they wil be the ones where you can obtain reclaiming capacity charts/figure for the tonnages per hour.

The capacity of the mac hine is entirely dependent on the bucket size, motor sizes and conveyor belt width that is installed with the system simply because belt and bucket speed are identicaL as they operate as one system for mining reclaiming and stockpiling.

lzaharis ■

Design capacity of equipment is the absolute maximum allowable performance of the machinery.

Rated capacity is the perfomance that the customer specifies.

Average capacity is vague and often refers to the output after accounting for working pile edges, machine movements and operator shift changeovers etc.

So if the specification is worded sufficiently ambiguously perhaps rated and average will gel.

A manufacture's reasonable fallback figure is the rated capacity on the simple grounds that he is not responsible for the day to day machine operation: But!

If you wish I can design your bucket wheel machine to save you trying to source a copy of the TransTech Handbook which I believe went out of print some years back. ■

Kind attn. : Shri Rushabh Shah,

The discharge rate from bucket wheel on boom reclaimer is cyclic in nature. The discharge rate variations are related to bucket wheel location across stockpile face at a particular instant, stockpile total shape / dimensions, whether reclaiming is at top bench or lower bench, whether at stockpile ends, etc. Such bucket wheel reclaimer has peak reclaiming rate as occurring during reclaiming. The peak reclaiming rate can be said peak design capacity. The word design capacity is somewhat vague although it is often understood as maximum handling capacity.

The material quantity actually (or calculated) reclaimed during say 4 hours, considering all movements during 4 hours time, as it will normally occur, is used to calculate average reclaiming rate. The average reclaiming rate is this quantity in tonnes divided by 4 hours. The guaranteed average capacity (rate) will be somewhat less than the average expected value, as a contingency or commercial safety.

The ratio of average reclaiming rate divided by peak reclaiming rate is called reclaiming efficiency. The reclaiming efficiency of this machine can range from 70% to 90%.

The more flat portion at the top of the stockpile will tend to increase the efficiency. Higher the degree of automation, more will be the efficiency. In general longer boom also tends to increase the efficiency.

The peak reclaiming rate, average reclaiming rate and expected reclaiming efficiency are calculated quite precisely and reliably. Such kind of work or its application training is a part of design engineering services.

Regards,

Ishwar Mulani

Author book - Engineering Science and Appication Design for Belt Conveyors

Author book - Belt Feeder Design and Hopper Bin Silo

Tel. No. : 0091 (0)20 2587 1916

Email : parimul@pn2.vsnl.net.in ■

I am reminded of the old phrase "When I use a word, it means just what I choose it to mean -- neither more nor less.."

In the case of customers and suppliers both parties should be sure they are talking about the same thing less one is disadvantaged.

There is always a danger in expecting any book to

1) contain the information being sought

2) containing a definition acceptable to all parties ■

Originally Posted by I G Mulani

Kind attn. : Shri Rushabh Shah,

..... The word design capacity is somewhat vague although it is often understood as maximum handling capacity.

..........

The peak reclaiming rate, average reclaiming rate and expected reclaiming efficiency are calculated quite precisely and reliably. Such kind of work or its application training is a part of design engineering services.

Regards,

Ishwar Mulani

Author book - Engineering Science and Appication Design for Belt Conveyors

Author book - Belt Feeder Design and Hopper Bin Silo

Tel. No. : 0091 (0)20 2587 1916

Email : parimul@pn2.vsnl.net.in

You seem to mean "....vague design engineering services".

Is the Trans Tech book still available? ■

Dear Mr. Shah,

Rated capacity is capacity at which machine has to work on continious basis to meet the process requirement.

Design capacity is the max. capacity of machine at which it can work.

Average refers to the total reclaimed material divided by time elasped.

Book I refer ' STACKING, BLENDING & RECLAIMING " EDITED BY DR. R.H. Woblier.

Regards.

A.Banerjee ■

Originally Posted by A.Banerjee

Dear Mr. Shah,

Rated capacity is capacity at which machine has to work on continious basis to meet the process requirement.

Design capacity is the max. capacity of machine at which it can work.

Average refers to the total reclaimed material divided by time elasped.

Book I refer ' STACKING, BLENDING & RECLAIMING " EDITED BY DR. R.H. Woblier.

Regards.

A.Banerjee

Thank you for that clarification. Now that we know where the book is; can we address more future questions your way? ■

Dear Mr. Izaharis,

Can you explain me the following.

1. How capacity is related to motor size. I know that capacity is

Q = NZI/60 cub, m

N= RPM of bucket wheel

Z = no. of bucket

I= Bucket capacity. cub. m

2. Belt speed is always higher than bucket wheel RPM.

3. S/R is generally not in use in mining application.

Regards.

A.Banerjee ■

Dear Sirs,

Publisher is TRANS TECH. Yes , it is available. For proper understanding of capacities one should read chapter no-10 written by Jhon .F . Oyler.

Regards.

A.Banerjee ■