... Back to the Drawing Board. But you definitely don't have anything resembling that fine tool.

How might you intend to contain the powder within the bin? According to your shocking drawing the large bore delivery pipe will spew dust all around the neighborhood as soon as it reaches height.

You'll never get this, may I quote? "half arsed" scheme beyond a design review. If the working pressure into the tub is 1.8 bar^g where does the unloading pressure of 2bar^g come from? I've seen a similar idea in Saath Efrika, way back, where an 85t off road tipper truck allegedly supplied 7bar^g to the brake system from a suspension system tank charged to 5bar^g.

An 8"NB pipe is far too big. Before this big upcomer the ash will have passed through a flexible spiral wound coated hose, normally stowed on the tub and dropped into a 2 bolt flange socket and secured by swing bolts (does it sound like I know about tank unloading?) Your upcomer should be the same bore as the hose, which to my shame I can't recall (my Class I licence expired when I turned 65 and I never bothered renewing that, or my ADR certificate, or my tachograph card). The thing is that a larger bore pipe slows the exigent flow down and makes it very difficult to blow out the product at the end of the job because material just falls down the standpipe. ■

Originally Posted by sumeet

Dear All,

Could anyone suggest on the detail calculation to arrive at Compressor Sizing.

Vertical = 30m

Horizontal = 50m

No of Bends /angle = 2 / 90deg

Fly ash Bin = 90 Tons ( Its an open system to atmosphere...refer attachment pls)

Pie Dia from bulker to Bin = 200NB

Bulker capacity = 30 Tons

Unloading rate of Bulker = 40 TPH

working pressure set at bulker = 1.8 bar(g)

Unloading pressure at bulker = 2 bar(g)

FAD of single stage screw compressor = in m3/hr ???

Is this information sufficient ...if not what more input required..

Thanks

Sumeet

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Dear Sumeet,

For sizing the compressor, it is easy to run the calculations your self. Just use my article "MOVING AIR IN PNEUMATIC CONVEYING SYSTEMS", published in Chemical Engineering magazine in the September 2011 issue. I will be glad to send a PDF copy of this article if you need one.

Regards,

Amrit Agarwal

Pneumatic Conveying Consulting

polypcc@aol.com ■

Dear Sumeet,

Fly-ash: particle size?

Has the bulker its own compressor, if so, what compressor volume?

What request is ruling?

-The capacity of 40 tons/hr

-The pipe size

Anyway, the combination Atlas Copco GA 110 and the 8” pipeline is not correct.

The 8”pipeline is too big or the compressor alone is too small.

Have a nice day ■

Hi Sumeet,

If you have already bought the compressor, don´t worry. Follow my first instructions and

use a frequency inverter and adjust and control airflow and pressure.

Best regards

Klaus Schneider ■

Dear Sumeet,

I would like to give you some short advise:

1) Forget the open system - it´s stupid!

2) Forget the 8"- Line -it´s also stupid!

3) Use a 5" line instead

4) Use a compressor with a capacity of approx. 850- 900 m3/h and 2 barg

5) Close the receiver hopper and fit him with a jetfilter (approx. 30m filter)

And all your problems are solved! If you need a more detailed advise, please ask.

Best regards from Cologne (Germany)

Klaus Schneider ■

Originally Posted by sumeet

Dear All,

Could anyone suggest on the detail calculation to arrive at Compressor Sizing.

Vertical = 30m

Horizontal = 50m

No of Bends /angle = 2 / 90deg

Fly ash Bin = 90 Tons ( Its an open system to atmosphere...refer attachment pls)

Pie Dia from bulker to Bin = 200NB

Bulker capacity = 30 Tons

Unloading rate of Bulker = 40 TPH

working pressure set at bulker = 1.8 bar(g)

Unloading pressure at bulker = 2 bar(g)

FAD of single stage screw compressor = in m3/hr ???

Is this information sufficient ...if not what more input required..

Thanks

Sumeet

==================================================================================================== ================================================================================

As my friends John and Teus have said you need to go back to the drawing board.

Any elbow IS YOUR ENEMY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Any large diameter pipe transfering material with a small air supply will clog and accomplish nothing

Substituting an "air compressor" for a positive displacement blower for material transfer wastes energy.

Due to;

reduction in transfer speed

material buildup at elbow affecting the air speed in piping and affecting particle speed

due to gravity and compaction of dust at elbow

Any pipe conveying material requires a huge amount of "POSITIVE DISPLACEMENT OF CONVEYING AIR"

from a rotary lobe blower.

This means the entire cross section of said pipe has a pressure gradient that is equal across the square area of the inside diameter

of the pipe.

Compressed air is like water and electricity its lazy and tries to escape and cause mayhem and does little work when loosed "into the wild of a large diameter pipe"

Surge tanks/storage tanks for compressed air are simply tanks containing and restricting the "compressed air" flow and nothing more.

YOU need to spend time talking to a qualified vendor rather than attempting to do this by yourself as it will only end badly for you and accomplish nothing other than creating a huge mess.

An open reciever is just that AN OPEN RECIEVER which places no restriction at the point of exit to allow effective restraint on the conveying air

and control of the material and the exiting air

Spend some time studying the gas laws and the noble gasses and you will see "WHERE YOUR MISTAKES" lay in wait to attack you.

AS My dear friends would say thats a huge cock up(screw up/mess/mistake in the making). ■