Multiple outlet designs are possible, and I have seen twin, triple and quadruple outlets on conical silo designs. Where you will have to be very careful is in considering the structural implications when you have one or two outlets operating only - or sequential operation of the outlets. Considering the size of you proposed silo, the last thing you should run the risk of generating are bending moments in the shell of the silo at the boundaries of flowing and non flowing regions of material. As with any storage vessel design/modification you really ought to invest resource at the start of the project to characterise the bulk particulate to be stored and base the design (for reliable flow and structural considerations) on the data obtained.

In summary, what you are proposing could be undertaken - but you must consider the structural implications imposed by the flow patterns that will develop and the way in which you will operate the outlets. Proceed with caution.

Regards

Richard Farnish

The Wolfson Centre for Bulk Solids Handling Technology

University of Greenwich

Chatham, Kent

UK

www.bulksolids.com

r.j.farnish@gre.ac.uk ■

DEAR Ghadridjan , Please note that a steel silo having 5000 m3 cap. is not adviseable,you can go for 2x2500 t cap.,It is posible to have 4 outlets at the bottom of the hopper,the advise given by Mr.Richard Farnish is very logical.

libran seth ■

DEAR SIR

I have Designed 5000 T silo for storing DRI to MP Iron And Steel Gwalior India

This silo is having !2 m Diameter and 4 openings at bottom. Each opening is provided with vibrating feeders and material is discharged to common belt conveyor

I donot think any problem Silo can be designed for 3 openings as Desired

A R SINGH ■

Dear ghadridjan

four opings will be in two rows However you can change orentation of vibrating feeders for making suitable for feeding to thee conveyors.

Altenatly you can provide three openins at 120 degree and each opening can feed to individaul conveyor

A R SINGH ■

You provide three opening @120 degree or four opening @ 90 degree . Each opnig will be connected with individual cone and sutably joined at top with sufficient valley angle to a common culinderical hopper. In both the cases proper design can be provided to have free flow

A R SINGH ■

Dear Ghadridjan

First of all you fix location of all three openings by Centre line of conveyors. Considering about 800 mm belt width and 1000mm walkway center to center shall be about 2300 mm between two conveyors . outer to outer of thee conveyors will be about 6000 mm Based on above requirement all the three openings should be inside 6 m Radius

You can reduce 18 m dia silo to about 6 m dia silo considering 55 degree side angle. You can join this bottom to 3 nos of 600 dia openings through transition piece Sides of transition piece to be properly designed to have atleast 50 degree valley angle

Shell thickness will be based on your Structural design calculation requirement considering corrosion allowance

As rough estimate you can check design with 12 mm thickness at conical portion and 8 mm at vertical portion considering 800 mm stiffner spacing

You may consider following

!.0 While discharging DRI in 30 m silo material will be degraded, you may have to

consider rock ladder or spiral chute inside the silo to avoid material degradation

2.0 To avoid spontaneous combustion you may have to provide nitrogen perging

3.0 Some times client changes product tlike DRI To HBI Discuss with End User and design silo considering HBI density

In case you need Any other Help Please send me Details

best regard

A R INGH ■