ash silo

[Giuss]

I have to design an ash silo

ash density is 1,44 ton/cum

the capacity shall be 90 cum.

Internal pressure is due to the statichead of ash

which will be the optimal ratio between height and diameter??

thanks

 

[MJCronin]

Giuss...

Your volume at about 90 cubic meters (~3178 cu ft) is very modest and tells me that you are looking for a shop-built silo.

for a shop-built silo, I would consider the use of a ~ 11 ft (~3.5 m) diameter silo with about about a 34 ft (~10.0 m)shell. The hopper section volume should suit the specifics of the material stored.

You probably want an aggresive angle on the hopper below - perhaps 60 degrees from the horizontal - to promote flow.

If the material is sticky, they you may want a device on the hopper to induce flow.

My guess only...

-MJC

 

[Giuss]

At the end of the hopper a vibrating feeder...


Thank you

 

[LSThill]

Giuss (Mechanical)


Pressure Vessel Design Manual Third Edition, Dennis R. Moss
Design of Vessel Supports
Procedure 3-5
Vessel on Braces Legs (7): Bin or elevated Tank page 133

Reference:
Structural Engineering Handbook Edwin H. Gaylord, Jr. and Charles N. Gaylord.

1)Other option using Bentley: STAAD products has a templet for Bin or elevated Tank.

2) USE any ASME Sect. VIII, Div. 1 software application for your design.


L S THILL

 

[LSThill]

Giuss (Mechanical)

Reference Pip.org

http://pip.org/practices/vessels/index.asp#BI

VEDBI003 - Vessels for Bulk Solids Data Sheet

This Practice is the data sheet required to define options covered in PIP VESBI002, Design and Specification of Vessels for Bulk Solids, and other specific requirements applicable to the particular vessel under consideration for service (startup, normal operation, upset, shutdown), location, maintenance, etc. This data sheet contains sections titled "Engineering Requirements," Process Data for Contained Product," Supplementary Data to be Provided by the Supplier," Materials," Summary of References," "Engineering Notes," "Nozzle Schedule," and an area for a sketch of outlines of equipment and dimensions that the manufacturer must hold.


VESBI002 - Design and Specification of Vessels for Bulk Solids

This Practice describes the materials, design, fabrication, inspection, testing, and documentation requirements for the construction of atmospheric and low-pressure, welded, shop- and field-fabricated dry bulk solids bins, hoppers, silos, and gravity blenders for various chemical facilities. These bulk solids bins, hoppers, silos, and blenders generally meet the philosophy and requirements of Section VIII, Division 1, of the ASME Boiler and Pressure Vessel Code, henceforth referred to as the Code; however, Code inspection and stamping are not required.

This Practice designates requirements for the design and construction of welded, cylindrical shell, single-wall vessels having internal design pressures not exceeding 15 psig and/or full vacuum external pressure at the top of the vessel in its normal operating position. Data sheet PIP VEDBI003 is required to define options covered herein and other specific requirements applicable to the particular vessel under consideration for service (startup, normal operation, upset, shutdown), location, maintenance, etc.





L S THILL

 

[rmw]

You don't need to guess at the hopper angle, you need to KNOW the angle of repose of the ash that the silo will store.

rmw

 

[MJCronin]

rmw..

I agree with your comment about angle of repose......

My mention of the 60 degree slope was an estimate in order to enable Banu to get an overall height of the silo.

I am not sure that anyone who asks questions about silo diameters and heights even understands "angle of repose"

I think that the Gaylord text is the one most widely used in industry.

-MJC