Seed Density Chart

Hi farmatt,

Agreed, I tried Google also - useless in this case.

Do you have an elevator (grain not people) in your area? The operator there may be able to help you or may have a source that could help you.

Another idea, maybe an outfit like Gurneys - http://gurneys.com/default.asp

I read a while back that they used to do their own packaging, or at least maybe they could steer you in the right direction.

Good Luck!

farmatt,

This isn't gravity feed, but you might find something here:

1. Pneumatic conveying characteristics of some agricultural seeds ...by M Güner - 2007
2. Pneumatic Conveying Characteristics of Cotton Seeds - Elsevier Show more results from linkinghub.elsevier.com
3. Bulk-Blog » Pneumatic Conveying, Performance and Calculations!
4. Pneumatic conveying characteristics of some agricultural seeds
5. Handbook of pneumatic conveying engineering - Google Books Result

Good luck!

You might also try the local university's ag department.

All of these seem to be with powered flow,

What I am looking for is more like a minimum angle of flow at maximum flow through minimum pipe size

These guys were helpful when I used to work in a pasta plant. Had to move dry ingredients every concievable direction and distance. Might be worth a look.

Thank you all for your help. I learned some things.

After much time on the internet searching and asking questions, I got mad and bought about $1000 worth of pipe.

Varying in size in material, I mounted them into a framework that would hold them all at the same angle and started pouring various types of seed down them at a minute adjustment to the angle every time.

This is what I found:

Stainless Pipe worked the best (no surprise there)

Almost ALL materials even mildly related to plastic (including PVCs) caused a build up of static electricity and thus created build up and cross contamination of materials.

my results are written in pencil on the nearest wall to my experiment but it looks like I will most likely go with a galvanized ducting type pipe about 10 to 14 inches in diameter and maintain as steep an angle as I can and still fit in the building I am working in.

By the way, Egyptian Brome (a type of grass) was the most difficult to work with, it flowed like dumping damp feathers through the pipe.

Arrowleaf Clover was the easiest and flowed the best like pouring 1/16" ball bearings.

Thanks again,

Matt