Jump to content

Flow Rate Change

Recommended Posts

The client wants to capture flow rate over pressure data for a pump under test. Pressure is increased steadily over time. At some point the pump's relief valve opens up and the flow rate increases proportionately. The resulting graph shows an abrupt 'dogleg' bend of approximately 20 degrees resulting from the increased flow. The 'legs' of data both before and after are relatively straight lines.

The problem is to identify the point at which this dogleg occurs. Any ideas?



Link to post


I cannot present any screens yet as the system hasn't yet been commissioned. The image I'm describing is from the end user's hand drawn graph. Their people ran a few manual tests and recorded the data by hand just to verify that it was doable.

I met with my client today who described how he thought the data should be tested. The idea is to run it through a filter first to remove the noise and then through a differentiation function to identify the bends (turns out there are two 'doglegs' per test, not one). I guess the only remaining question is which filter to use.

Thanks for the response though.

Jeff :thumbup:

Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.