×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Testing a peristaltic pump

Testing a peristaltic pump

Testing a peristaltic pump

(OP)
Hi all!

I have set up a simple flow line to test our peristaltic pump. It turns out to be that the flow rate is so small. I think it is even smaller than the one given by the manufacturer.

The pump was made by verder. Instead of using water, I am using glycerin-water mixture.

My flow line is: reservoir-tube(25.4mm inner dia.)-adapter-pump-adapter-tube(25.4 mm ID)-flow meter-reservoir

The adapter is self made by our workshop. The reason is that up to four heads can be installed on the pump.

Is it because I am choosing too big diameter for the tube? My adapter is also quite large.

It turns out that I can only use 3 out of 4 heads. If I use 4 heads then the motor's power won't be sufficient.

I have no idea why this is happening?

Any suggestions would be much appreciated.

Thanks!

RE: Testing a peristaltic pump

If the peristaltic tube, the one within the pump head, is too thin, or the shoe against which it's squeezed is too distant from the rollers, the pump capacity is essentially zero.

Once you get that fixed, you might want to test the pump against a restriction representing the installed system head.  If you make the restriction variable, you will find that the pump's capacity curve is not a straight vertical line on the Q-h diagram, and that it may not even be a straight slanted line.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Testing a peristaltic pump

(OP)
Hi Mike!

How do I check the distance between the roller and the shoe? Have you ever used verder's pump? The shoe cannot be adjusted. For each head, I used 45-50 cm long tube. The tube inner diameter is 15.9 mm and the wall thickness is 3.2 mm, and that is in accordance with the manual.

Thanks

RE: Testing a peristaltic pump

1.  Maybe you can get a telescope gage in there.
2.  No, I haven't used verder's pumps.  I've bought a few of other brands, and had a hand in designing and/or fixing custom versions in half a dozen products.  I know lots of ways to make a peristaltic pump that isn't quite as good as I think it should be.

It's beginning to smell like you're not using Verder's official tube.  That may be your problem.  

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Testing a peristaltic pump

Driga: Can you tell us the Verder pump model?

And can anybody tell me what "four heads" on a peristaltic pump mean?

RE: Testing a peristaltic pump

(OP)
Hi Mike,

Do you think tube selection plays a big role here? What I use is Noprene A-60-F. I do have verderprene. I did call verder's representative but their response is quite slow.

What is telescope gage?

To mica,

Hmm.. four heads mean it has four channel. Four tube can be used simultaneously.  

RE: Testing a peristaltic pump

Verder's website tells me that the hose size of a Silicone hose is 16 x 3.2 mm while the Verderprene hose shall be 16 x 4.8 mm.  

RE: Testing a peristaltic pump

important is that the shoe seals off the hose
(check by trying to blow through it)

RE: Testing a peristaltic pump

(OP)
What I had from the invoice is verderprene with an inner diameter of 15.9 mm and wall thickness of 3.2 mm.

The type of the pump is S30 L-series.

To CH50H: I will do your suggestion.

RE: Testing a peristaltic pump

(OP)
I have checked by blowing air into the tube. The shoe perfectly seal the tube.

I changed our noprene tube with verderprene (same inner diameter and wall thickness).

I thought it is going to work but it is not. I have attached a short movie about the error.
 

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!


Resources