hi sulaiman,

capacity= density of cement(kg/cu.mts)X volume of flat(cu.mts) ■

Dear mailmeravi, This is not so simple.There are various methods for storage and extraction of cement from the Flat storage.

Libran Seth

www.libranenineering.com ■

As Libran Seth has so eloquently stated there are many variables to your puzzle.

Your stated dimensions for desired storage occupy 1404 cubic meters of volume.

This begs the questions:

Will the cement you are inquiring about be bulk in quantity-loose unpackaged powder?

Or will it be bagged cement?

Or will it be a mortar mix?

Or wii it be an aggregate bag mix?

Or a sand/cement mix?

Packaged cements are typically packed in 80 lb. bags with either sewn or a valve pack bag package and each pallet has 40 bags per pallet if my recollection of it is correct.

The dimensions you has mentioned in your posting leads one to think it is a warehouse.

A rough estimate for storing pallets of cement using your stated dimensions gives us:

pallet storage stack:

164 by 73 by 5 pallets high in warehouse.

equals 59,860 palllets:

164 by 73 by 5 pallets tmes 40- 80 bags per pallet weight of

bags per pallet equals 191, 552, 000 pounds of cement.

Which equates to two million three hundred ninety four thousand

four hundred bags.

2, 394,400 eighty pound bags.

A pallet stack being one hundred sixty four pallets long

by seventy three pallets wide by five pallets high giving us a total of fifty nine thousand eight hundred sixty pallets of bagged cement times fourty bags of 80 pound each equals.

One hundred ninety one million five hundred fifty two thousand pounds of portland cement in bagged palletised storage.

Storing the bagged cement without pallets gives us a little more:

In additional two hundred thirty nine thousand fourty bags for an additional weight of nineteen million one hundred twenty three thousand 200 pounds of cement in bag storage.

Until we have all the pieces of the puzzle you have presented to us in part we can be of little help to you as forum members.:^(0 ■

Dear Mr Sulaiman,

20.000 tons to 25000 tons, depending on the design and layout of your flat storage.

After you have made a preliminary design, you can calculate more precisely.

The last step is recalculate your definitive design.

I quessed the bulk density at abt 1400 kg/m3

success

teus ■

Dear Mr Sulaiman,The size you have mentioned shall not be used entirely for storage of cement,in flat type storage you will have to take care for the following faclities/equipment---

1.Passage for small dumpers for conveying of the cement to nearby points.

2.Place for silo extration system/pit,bulk loading(some times inside the shed) ect.

3.You can not fill this flat storage as you are allowed in other type of silos.

4. The above system is very attractive price wise, in the begiining but requires lot of maintainence and enviromental problems ect.

5. This type of system is mostly reccomended for temporary purposes.

Libran Seth ■

I wish you had said this from the beginning.

It wont work very well at all due to the nature of the product and its individual parts-sand/aggregate/cement

You need height for for bagging hoppers and bulk load outs and thier is really no way around that unless you want to invest in a huge vacuum system to fill small bins for premix but-it will require numerous fillings to move any substantial amount of cement and unless you can guarantee mixing proportions for dry mix it will be nearly impossible.

A pnuematically filled six silo set up is best simply because of height and the ability to premix before bagging and bulk loadout and a small building is all that is required for bagging.

In addition you will need a bucket elevator to lift the aggregate to the top of the aggregate silo for storage and premixing before itr is bagged or dry loaded in its proper proportioning.

You will need augers to properly mix and blend it then feed it to the bagging plant and simply elevating the whole things takes advantage of gravity and reduces work. ■

Dear Mr Sulaiman,

Dividing your flat storage into 6 sections with fluidized bottoms is, of course, possible

but will lead to a rather inefficient installation.

The fluidized bottom reduces the cement content significantly.

Investment per ton storage increases (which actually is a trade off against future labor).

Requirement of fluidization installation and extraction system (vacuum, screws, elevators etc.)

Mr Izaharis described already the implications that have to be faced.

It is a good procedure to question all possible solutions.

Each possible solution has to be evaluated in an overall preliminary design followed by an operating cost estimate.

(Not much work for an experienced expert/contractor)

It is sometimes better to know why you did not build your installation otherwise than you did.

The money you are going to spend justifies the efforts.

Success

teus ■

Dear Sulaiman, Please find below answers of your querries--

If I divide the flat storage (50 m x 90 m x 8 m(h)) into six room each 25 m x 30 m x 8 m(h) and have filling point to each room

is it possible--Yes, everything is posible but the best would be-to go for six nos. off 25 diax6 m ht.silo,you will get aprrox. 15-16000 t capacity,by providing divertor valves at the bottom you can extract cement from any silo,the bottom of the silo shall be 8-10 deg in slope with fluidisation system,In india similar type of silos are installed in the state of Gujrat,please note that you need to have pre engineering done for this type of custom built system.No supplier will do pre engineering for this type of custom built system.

The positive point of this system are--

1. You can shift the same.

2. Can get some of your money back after using it say for 15-20 years.

3. Very less pollution.

4. Less maintenence.

5.Less running cost.

to have fluidization floor to extract the cement from the storages and convey it to either bulk loading or packing plant?

What I am trying to do:

1- Not to use front loader

2- To have more then one storages to give flexibility of storing more then one type of cement

3- To reduce the runing cost

4- use the best we can from the space available to store cement

5- have higher loading rate per h (for both bulk and bagging plant)

6- two loading bulk spot

8- two Rotery 8 spot bagging

(please note that the height is the max we can go to which is 8 meter)

**** The other question ****

can the rotary packing plant fit under 8 meter height store with all the other parts such as the control bin, reject screen, …etc

or what other type of packing can be used to fit under 8 meter hieght--

Answer--In 8 spout packing plant generally the ht. of the building is 25 m and the ht. of the Bucket Elevator is 22 m,if you want every thing with in 8 mt. ht., this can be done by using inclined screw conveyor for feeding the bin above packing plant.Similar type of system can be designed for bulk loading also.I also suggest you to go for 6 spout machines instead of 8 spout otherwise ,you need extra space of 6-7 m for two machines of 8 spouts.

best regards

Anil Seth

0091-9811055650

www.libranengineering.com ■