Hi

Your silo looks quite small (Diameter < 20 m), so that a sloped floor or how do you say ''triangular pramids'' is the better way to encrease your live capacity.

Best regards,

Martin Wuerth

http://www.wuerthconsulting.ch

wue@wuerthconsulting.ch ■

Dear douglnij,

You haven’t given the silo dimensions, however, looking at the picture and scaling the shovel to the silo edge, I estimate the silo diameter approx. 15 m

Assuming a standing wall angle of 60 degr. of the dead cement, I calculate a dead load of approx 200 to 250 tons.

Placing triangular pyramids between the air slides does not increase the live load of the silo. You replace the dead volume of cement by another structural volume.

I expect no improvement of flow ability of the dead cement as there is no dead cement anymore.

The only solution is to fluidize the dead volume of cement and that can be done by extra airs slides, using the same air slide blower with alternating valves.

Whether the investment is worthwhile, depends on the profit gain compared to the cost.

Have a nice day

Teus ■

Gentleman,First of all the area of internal open air slide is very less,please increase the area.

The extraction air slide arrangement is also not correct.The best way is--

1.Increase the area.

2.Bring all the material from all the points to centre of silo.

3.Take out the material from centre of silo in to a small bin 5 to 10 cap,this bin will have fluidisation system at the bottom.

4.Finally take the material where ever you want.

The pressure in the open air slides inside the silo 630 mb

In the closed bin 63 mb.

We can design the internals and the outer system provided you have budget for the same.We can even supply you fabrication dwgs, for the entire system.

Our Experiance--Worked with I Bau Hamburg--Collaborator In India and designed more then 30 systems in India and also visited I BAU'S OFFICE IN HAMBURG.

Regards, Anil Seth

www.libranengineering.com ■

Hi

As you have the extraction airslide in the silo. I think that you have an issue with preferential feed due to this.

The extraction airsldie creates a flow channell in the silo and then all other discharghe flows acc.

You have rhe risk of eccentric loads on your silo walls which may or may not be an issue.

There are some ideas

Place the extraction airslide under a tunnell system > so it is a tranpsort airslide only (and also connect this up to a separate air supply)

Look at separate conections for the air suplly to each section and then rotate the supply. Air will flow to the path of least resistance - when an airslide is exposed, then this will use the most air.

Look at installing more airslide as a percentage of floor areas...typ is 50% coverage.

Cheers ■

Gentleman, By Introducing pyramid your capacity of silo may reduces down but it will not effect the motion of cement.Please note that famous I-BAU silo are with INVERTED CONE DESIGN and working fine throughout the world.

Please go by references and not by ---

Please also keep the forum members in the list of your colleagues.

In fact I have prepared a dwg. for you which I was going to send you.Since, you have intelligent colleague, I think, there in no need to send the dwg. now.

Regards, Anil ■

Gentleman, This is still incorrect.Please note that the cone should be in centre,This shall be a hollow cone with opening on the periphery of the cone to suits open airslide size.I hope this time you will not repeat the mistake of doing engineering which will trouble you up the existence of your silo.Please note that you have to change the existing airslide also for better flow and aeration.

Regards, Anil

www.libranengineering.com ■

Dear douglnij,

When placing the tapered pyramids between the radial air slides, you might create zones where the cement can form arches between the converging slopes above the air slide.

The concerned air slide will lose all its air without fluidizing the cement. Instead having a dead load, you will end up with a dead silo.

Insert tangential air slides between the radial air slides, whereby each tangential air slide is aerated from a radial air slide.

The radial air slides are then aerated one by one in a rotating sequence from outside the silo.

Take care

Teus ■

My suggestion was to place the extraction airslide in a tunnell - this is the airslide that goes to the silo wall and outside.

This was you re create a true centree discharge silo - there is no short circuiting of cement flow directly to the extraction airslide

Your silo is discharging un eveenly and this is going to have structural implications.

I would also suggest more airslides and have them piped/valved separaetly.

Do one thing at a time - cheap first and then more $$ .

Over and out ■