DEAR NEERAJ,

PLEASE CLARIFY THE FOLLOWING POINTS--

1.FEEDING OF THE SILOS SHALL BE DONE PNUEMATICALLY OR BY BUCKET ELEVATORS.THIS WILL ALSO HELP US TO DESIGN THE DUST LOADING FOR SELECTING THE DUST COLLECTOR.

2.FOR 10 TONNES SILOS WE SUGGEST TO GO FOR SEEL SILOS.

3.A PROPER FLUIDISING SYSTEM TO BE PROVIDED FOR THE EXTRACTION OF CEMENT.

3.AFTER EXTRACTION WHERE U WOULD LIKE TO CONVEY THE CEMENT.

4. IS THIS PROJECT IS FOR READY MIX?

WE HAVE DESIGNED MORE THEN 50 SILO SYSTEMS FROM 10 TONNES TO 25000 T CAPACITY.

WE WILL NOT MIND TO PROVIDE YOU THE COMPLETE SYSTEM

DESIGN,TECH.SPECIFICATIONS.FABRICATION DWGS. AND VENDOR

SELECTION.

U CAN ALSO CONTACT ME ON 9811055650(MOBILE NO.)

REGARDS,

ANIL SETH-LIBRAN ENGINEERING AND SERVICES ■

dear neraj,are u looking for a cheaper method.feeding a 10 tonne

hopper manually is not advisable.in that case the bags have to be slit on first floor and then drop in to the silo which is also not advisable,there are automatic bag slitting machines are available in the market.how often you will empty the silo?.there is no need of feed hopper also for feeding silo.we can design a proper feeding and extration system.please be clear about your system.

regards,

anil seth-9811055650(mobile) ■

Dear Neraj,

it´s right was Anil tell to you.It´s much easier to fill Silo from ground as from top. You can fill the silo with a pneumatic conveying system or with bucket elevator. We have all this goods in our programm so we can quote for you if you will be interest.

Normally is to fill the silo with a conveyng system. If you fill material in the top of the silo inside you don´t need a rotary feeder at the top. But you use a filter with fan at the top of the silo so that there is an underpressure in the silo.

If you fill from ground you need a blower for blow the material.

if you only fill some times material in the silo it´s perhaps much cheaper to fill from the top.

If you interest we also can quote you bag emptying stations.

please visit our webside for more information.

www.bs-vertrieb.de ■

Our Primasonic Acoustic Cleaners have been employed in over 35 countries worldwide to solve material bridging and flow problems in a wide range of hoppers/silos in an equally wide range of dry materials process/storage and transportation industries.

For example within the cement industry our acoustic cleaners have proved to be a low cost, automatic and effective solution in silos ranging from a few tonnes to over 25,000 tonne capacity. Plus we offer our new clients a free trial. If you visit our web site at - www.primasonics.com - you will see many examples, plus you can download a silo questionnaire which you can complete and sent to us.

We will provide you with the appropriate acoustic cleaner solution. Should you wish to contact some of our many satisfied clients, let us know.

Best regards

Donald F Cameron

Primasonics International Limited

sound@primasonics.com

www.primasonics.com ■

Sir,

Very interested in your plans for the 10 tonne cement silo. As you will appreciate, cement in silos can give discharge problems because of its hygroscopic nature and tendency to fluidise if agitated excessively. Robin Engineering suggests you seriously consider our circle feeder silo discharge mechanism to provide a controlled, non-fluidised product discharge. Using a combination of two mechanisms rotating at different speeds, product flow is guaranteed and all possibility of bridging or hang-up in the silo is eliminated.

Kind regards,

Brian Milnes

Director

Robin Engineering Services Ltd. ■

A 10T bin is very small - are U sure of the size.

Depends u[pon your feeding arrangement eg pneumatic lean phase, or mechanicl eg bucket elevator.

The bin roof will need some sort of de-dusting equipment - either bin vent or ducted type to suit the de-dusting requirements eg pneumatic conveying (dust collector cap to be 2 x FAD of blower).

U may need a balance vale on the roof to cater for excessive over or under pressure esp for pneumatic conveying.

If outside, roof to be sloped and all hatches to be weather tight with lips (this includes all flanges).

Bin cone to be 60degrees - concial with a small live bottom outlet.

Use a round and flat floor with aeration pads - 2m3/m2/min aeration with PD blowers - 60-80kPa.

Discharge to be side from floor - depending upon flow rate needed, use proportional control gate - aperature can suit the flow rate control required. Consider power failoure and safe mode ie closing eg electro- pneu. control. Suggest min 200mm wide gate, have a manual op. slide gate upstream of the PG gate.

Use HP fans for air pad aeration of the downstream air slides.

U will also need de-dusting capacity for the downstream air slides.

This is it, nice and simple..do not worry about anything else.

Cheers

James ■

During storage cement will get compacted and will not discharge from the bin unless you prevent compaction or take measures to maintain flow. The bottom cone must be at least 60 degrees from the horizontal and the bin designed as a mass flow bin. To promote flow after storage, you can use aeartion cones installed around the conical bottom or use air cannons to prevent bridging.

Use smooth internal surfaces.

To transfer cement from bags, use a bag slitter and a pneumatic conveying system. Cement is abrasive, therefore, use a low velocity conveying system such as dense phase. If you use dilute phase keep the velocity as low as you can and use abrasion-resistant bends.

Amrit T. Agarwal

Pneumatic Conveying Consultants

polypcc@aol.com

www.powderandbulk.com/pcc ■

I'm an engineer of a company specialised in flat silos. In my opinion a 10T silo is too small, the investments for the installations are superior than the benefits.

Joan Manel Mulet

www.metalmollet.com ■

I suggest that you contact Portosilo Ltd, at York.UK. They make standard silos for cement and have great experience in site batching plant and the like. ■