×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Pumping charcoal particulate through a venturi jet pump against back pressure

Pumping charcoal particulate through a venturi jet pump against back pressure

Pumping charcoal particulate through a venturi jet pump against back pressure

(OP)
I am trying to set up a system where I can dose a charcoal granule into a line using a water-powered eductor system. Problem is that I would be working against an overall back pressure of about 150 PSI.

I'm not an expert on using jet pumps for transporting solids but I have set up an initial test that seemed to work well with a discharge hose that was just open to atmosphere, and pumped at low pressure (probably around 20 psi). This test was just to ensure that the charcoal does not sand out or otherwise clog the jet pump. Now when I hooked it up to a 100 foot line to continue, I get a backup into the vacuum side of the pump, I assume this is due to friction loss and the back pressure.

My question is, will this still work against the back pressure so long as I supply enough discharge pressure from my pump to overcome the back pressure?

I am using a .5in discharge line (100 foot hydraulic hose) which is connected to a jet pump (McMaster 4979K52). Again this was just my initial test set up to try to validate that it can transport the material without clogging, which it seems to do just fine. Discharge line is also smaller than the outlet of the jet pump (1in to .5in) which is also causing loss. I will be using a pressure washer with a 1hp motor and running at about 3 GPM.

Thanks to anyone who may be able to help!

RE: Pumping charcoal particulate through a venturi jet pump against back pressure

Some slurries do not behave well in pipelines, as they are not usually Newtonian with shear friction varying widely with small changes in velocities.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

RE: Pumping charcoal particulate through a venturi jet pump against back pressure

There are lots of very good papers on handling slurries, especially coal and other minerals.
This will be incredibly abrasive. You will likely need to end up having the jet section made from Stellite or ceramic.
The size ratios and driving pressure will need to be adjusted, but in theory it should work.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close