solids flowrate in gravity lines
solids flowrate in gravity lines
(OP)
Where can I find a good reference source for predicting/calculating gravity solids flowrate capacities in various line sizes?
Nothing in Perry's or any of my other design books, perhaps its a mechanical engineers gig?
Thanks
Tony





RE: solids flowrate in gravity lines
The "Piping Handbook" by Nayaar contains information about gravity drainage of piping versus the slope and material.
For quick, ballpark estimates, use 1.5-2 ft/second average velocity and calculate a line size.
Let us know waht you find out about the best source for this information....
MJC
RE: solids flowrate in gravity lines
Hope this helps.
saxon
RE: solids flowrate in gravity lines
Let me be more clear about the question... I was specifically looking for dry solids flow only, not slurry piping. For example, solids out of a dryer with a drop chute.
Thanks
Tony
RE: solids flowrate in gravity lines
Hope this helps.
saxon
RE: solids flowrate in gravity lines
For flood-feeding an extruder, I believe you just look at the volumetric capacity of the extruder screw flights; and provide a flood feed line sufficient in size to fill the screw at its maximum rate AND to cover the flights at the pellet feed inlet.
Also, it is a good idea, to require the supplier of your equipment to guarantee his equipment with demonstrated rate testing after installation.
If you find a good web site let me know.
Last, one thing you will need to know is the bulk density of the pellets in order to equate volumetric displacements to the actual mass flow in pph. Note this is not the same as the density of the material; bulk density reduces the density to allow for the void fraction.
The more you learn, the less you are certain of.