g/cc = gram/cubic centimeter

1' = 12" = 12x2.54 cm = 30.48 cm. With this conversion factor you compute your volumes in cc and x by the specific weight in g/cc. You obtain a weight in grams, divide it by 1000 and get the result in kg as you want to have it.

For your information if you ask google for "units conversion" you have a lot of free calculators for all possible units.

Thank you nick name. Indeed a great help.

Now please help me out in calculating with the Volume data given and bulk density ft3.

Thanks n Rgds.

My dear "Guest" - my "know-it-all" mystic buddy ! Thank you.

I've been desperately looking around to calculate this for now nearly 2 months but afraid to ask for, others might think I'm asking a stupid question. Well as it says in over 90% drawings " When in doubt - ask". I told myself, 'what the heck, go ahead ask my friends'.

Thank you. now I can calculate both in ft3 & g/cc on bulk density of any solids.

I am actually not so mystic now - I have registered and have a profile

But apparently did not sign in for that answer.

I may have missed it. Please name?

My name is "Guest." - you can click on my profile to the left

MYSTIC AGAIN!!! Ok atleast I can adress as 'Guest'.

However, you mention that the full volume is only 1583 ft³,

I have been very closely following thread " Recovery in Belt Conveyor and Bucket Elevators" raised by Gussosa with Babybear, DaveB & Phoenix911 contributing in.

Babybear vide thread# 38 mentions a site : www.powderbulk.com.

I went there and came across Calculator for Silo among other calculators. So I put in a dia 12ft x 20 ft (Eave height) and came across 1583 ft3 as level full mentioning.

Now I have a site where I can calculate exact size of Silos as well as work on with your calculation for any solids for its volume.Thanks again.

PS

I'll be thanking Babybear too in his thread.

I am sorry but I thought that you had a conversion problem not a product one, I assumed that you can compute a volume and a weight. Now you have from the other answer the result you wanted.

Yeah I think the problem could have been what exactly is "bulk density". So I will offer this:

Bulk density is the density of a volume of material, usually soils, powders, particulates that includes the material and the air trapped in between particles. Because each "particle" can not pack completely tight to the surrounding particles (and most particles will be different sizes with different edges), there will always be open space in the volume.

Regular "Density" or absolute density only accounts for the material itself.

In this case it is proper to use the bulk density.

As a side note: the absolute density is always higher than the bulk density. If you were to accurately weigh a single particle (a very small number), such as a single crystal of sugar and determine it's volume accurately (another very small number) - you could calculate the absolute density - but that would only be for academic purposes and would not really be of a practical nature.

No problem nick name my mistake. You nevertheless have been a great help. and Thank you.

Are you taking the angle of repose into account?

Or do you have a leveling screw?

Angle of response? When I went to www.powderbulk.com and worked on their calculator with example of Silo 12 ft x 20ft (Eave height)it mentioned :

Dia Eave Hopper Outlet Clear- Response Hopper Hopper Strgt. Level Shell Working Sp.

ft Ht. degree ft ance Ht. Vol Wall Full Vol cap. Elev

12' 20' 45 1' 2.5' 25' 5.5' 226 ft3 12' 1583 1357 1327 8'

Now by angle you mean 45? & Response 25?

Sorry :

Dia : 12 ft, Eave Height:20', Hopper degree: 45, Outlet: 1ft, Clearance 2.5ft, Response:25, Hopper height: 5.5ft, Hopper Volume:226 ft3, Straight Wall: 12 ft, Level full: 1583 ft3, Shell volume: 1357 ft3, Working capacity: 1327 ft3, Specific Elevation: 8 ft.

Repose- the angle a pile of what ever slumps to by gravity, add more and it slides off to form the same angle of repose. Different materials have different angles. It is a base to hight relationship.

is this by chance your school work?

Brad

Nay! I'm a grand dad. My real job is Energy Conservation in thermal-field of processing industries. Look up my web page: www.duconems.com. A client of mine because of my association with for over 30 years has entrusted me with helping him undertake Flour & sugar transfer to silos & processing (mixing plants of biscuit manufacturing). Never was my field but he'd not listen or trust anybody else.

Don't forget to take into account some materials may bridge. By this I mean, as the material is unloaded it may pack above the "unloading" screw conveyor and needs to be "broke" up.

Hi Ducon

If you want to design silos you need this book, or any other one of the Reimbert brothers.

For bulk handling conveyors this one is the best. This other one has been quite recommended to me.

The angle of repose is the angle of the slope of a pile of grain. Most silos are designed using a 27º slope. This means that your maximum capacity would be the lower cone (only if it is a hopper silo), the volume of the cylinder and then this cone at the top that has a slope of 27º. The roof has a slope of 30º. The bottom of the silo usually could be flat (to be emptied using bulldozers, shovels, brooms or a screw conveyor), 45º conical (dry loose material) or 60º conical (wet granules or powders). Those are the rules of thumb. If you do the maths something else may prove to be good.

For inert materials like flour, sand, sugar and coal you may fill the silo "up to the mouth", as long as the structure can handle the pressure. For grains you really don't want that cone to ever exist, as it will lead to bad aeration and decay / infestation in the center of the silo. As UV said, in grain storage the top of the mass must be leveled.

Storing bulk solids is not like storing water. During the unloading the silo suffers friction in the walls and it WILL collapse if you designed it as if it was a water tank. It is hard for me to give the details here.

Start by reading the chapter on solids at Perry's Chemical Engineer Handbook. Then read Reimbert's book.

Gussosa Thanks. I'll look up the books mentioned.

If you want to design silos you need this book, or any other one of the Reimbert brothers. - This book sold out & not available.

For bulk handling conveyors this one is the best. This one too sold out.

This other one has been quite recommended to me. Available .

When I go to Toronto/NY coming march I'll fish around and see whatever I can get my hands on.

Meanwhile thanks for these references, Now i know what types of books to look around for.

The publisher of Reimbert's book is Lavoisier. Look for other books at the site.

http://www.lavoisier.fr/fr/livres/index.asp?texte=reimbert&select=motcle&exact=on&togo=&support=NULL&from=

This is another book that deals with silo design:

http://www.amazon.com/exec/obidos/ASIN/3540737677/powdeandbulkdotc

However, it isn't as straightforward as Reimbert. It deals mostly with the physics of bulk solids and not that much with the silo problem.

In the meanwhile, you can read this article for free:

http://www.jenike.com/TechPapers/load-dev-silo-design.pdf

And check other stuff at Jenike's site.

http://www.jenike.com

If you want to throw yourself in this business, maybe attending a seminar of Jenike's company would pay.

Hello ducon,

I think you will find these tables and charts useful from powderandbulk.com

http://www.powderandbulk.com/resources/bulk_density/material_bulk_density_chart_a.htm

The site also has everything else needed to move the grain etc to port and load/unload ships.

It is a really interesting site and can save a lot of time if you can find the bulc grain or item you need details of.

Good luck and happy holiday....................

Hello ducon,

I found these Bulc capacity calculors which calculate according to the shape of the 'Tank' shape and size.

	Dry Bulk Capacity Calculator This calculator is for welded or bolted silos. Options include silos elevated by skirts, legs or other structural support members. Yields working volume and other values. Liquid Flat-Bottom Capacity Calculator Basic ground storage tank with a flat bottom calculator. Yields the working and total volume of the tank. Allowance made for free board. Liquid Slope-Bottom Capacity Calculator Basic ground storage tank with a flat, sloped bottom calculator. Yields the working and total volume of the tank. Allowance made for free board. Liquid Hopper-Bottom Capacity Calculator Elevated conical bottom storage tank calculator. Yields the working and total volume of the tank, plus springline elevation. Allowance made for free board. Horizontal Tank Capacity Calculator Horizontal storage tank calculator with options for ASME, dished, standard, elliptical or hemi-spherical tank ends. Yields the working and and total volume of the tank. Liquid Dished-Bottom Capacity Calculator Elevated dished bottom storage tank calculator with options for ASME, dished, standard, elliptical or hemi-spherical tank bottom. Yields the working and total volume. Capacity Calculators Provided by Tank Connection Copyright © 2004 The Tank Connection. All rights reserved.

I forgot to send these with the last post............

Dear babybear,

Yes because of you I was able to reach these sites and work on the calculators. I don't care what others would say but, you are worth cuddling.The 'Guest' too, for I am in constant email communication with him for the past 3/4 days and he has emailed me a couple of really good books . babybear thank you very very much.

Addition - sorry, Gussosa too. The Book he sent me too is helping me a lot.

Based on several previous cases I would suggest that in your spec you include the delivery of a total compputational proof that the conveyor corresponds to the functional specification and that under given functional conditions it will offer the required life expectancy and the MTBF which economical to you. Of course under different conditions those parameters will be different but it is good to have a reference value.

Hello Nick,

Based on several previous cases I would suggest that in your spec you include the delivery of a total computational proof that the conveyor corresponds to the functional specification and that under given functional conditions it will offer the required life expectancy

Clever advice from you Nick. Maybe even, where possible, give the client the choice of two or more Manufacturers conveyors or systems?

Take care and happy holiday..............

Hello ducon:

I am pleased I helped a little. Umm, you can cuddle me any time you want! Please say you are a girl?.........Just don't tell anyone I said this OK?

So all my hours spent helping gussosa were worth it then. Can I ask what work you are doing?

Keep in touch please, OK?

Take care and happy holiday.....................

Honestly not Conveying. see my web. www.duconems.com . But, I'm now involved with conveying system for the first time.

I may have sent you this already, but this caculator can save you a lot of time and has how to convert weight to volume also. (could,t find a better sime;y with a BIG smile. That's Sparky's work)

Hello ducon,

I may have sent you this already, but this caculator can save you a lot of time and has how to convert weight to volume also.

Take care.....................