×
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

electromagnetic flowmeter for partially full pipe

electromagnetic flowmeter for partially full pipe

electromagnetic flowmeter for partially full pipe

(OP)
I am trying to convince a local sewer authority to allow my client to utilize an electromagnetic flowmeter for partially full pipe specifically a Parti-Mag II for process wastewater (vegetable washwater).  The Authority uses magmeters but only on sewer mains that are constantly full.  Their engineer has no experience with electromagnetic flowmeter for partially full pipes, thus he wants us to utilize weirs or flumes.  Do you have any documentation or testimony that can be use to convince their engineer that electromagnetic flowmeter for partially full pipes is a viable metering device?
 

RE: electromagnetic flowmeter for partially full pipe

(OP)
Yes, but all manufacturers hype-up their products just ask any of them and they will tell you their product is the best on the market and it will do whatever you asked for...anyway everything I read on magmeters for partial flow shows accuracy of 3% to 5% of the actual flow rate, the processing plant's discharge is approximately .33 mgd.  Maybe the authority is worried they will lose revenue or they will miss out on a $10,000 fine if the factory discharges more than allowed. But I don't believe measuring through weirs or flumes are more actuate. The authority's operators are hands-on people and if there is literature or study's done on actual operating systems or even other operators' testimony of using these products would be beneficial.

RE: electromagnetic flowmeter for partially full pipe

Conventional magmeters by major or minor manufacturers make no claim to measure partially full pipes and specifically state flows are accurate only with a full pipe.   However, this ABB model does make a claim to measure a partially full pipe.   ABB is not a fly-by-night outfit which I presume has some integrity in its product offering.

I side with IRstuff, asking why can't ABB provide some references for this product? Have you asked them? (or their rep?)

 

RE: electromagnetic flowmeter for partially full pipe

Also, try to modify the installation to include a rise after the meter to help maintain the meter segment liquid full.

RE: electromagnetic flowmeter for partially full pipe

I would contact Krohne. They have a partially filled mag meter offering and they have extensive waste water experiance.  They will likely have a reference.

RE: electromagnetic flowmeter for partially full pipe

The ability of a magflo meter to measure flows in partially filled pipes is heavily dependent on the design of the coils in relationship to the pickup electrodes.

I only have limited experience on actual applications, but believe that the Toshiba make a specific meter for this application that wraps the coils around an armature to distribute the magnetic field in a way that compensates for the partial fill.

http://www.toshiba.com/ind/product_display.jsp?id1=9&id2=91&id3=157

  

I trust this helps,
Mlv
http://www.coulton.com

RE: electromagnetic flowmeter for partially full pipe

consider a flapper check valve downstream.  This will keep the pipe full.

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