Steve,
Have you been using scrounged gear from the reject bin again?
Like you I would be looking at the diaphragm valve after ensuring that there is no random floating object moving around in your system as indicated by others.
The process valve you speak of (and is locked) will likely have an external position indicator; you have found nothing obviously wrong here?
Did you flush the system prior to commissioning to rid the pipe of excess Kiwi's?
We all would be interested in your findings.
Cheers,
Robin
P.S. The magflow you speak of, this is the meter you were enquiring about on previous postings? Is it serving your purpose?
Cheers,
Robin
>
> Oops
> Ok up to Magflow
> then across 1.5m to offset
> up 0.3m through offset
> across 1.5m to exit
> out the end
>
> sorry bout that chief.
>
> Cheers
>
> Steve
>
> -----Original Message-----
> From: Steve McKenzie [mailto:Mechproj@xtra.co.nz]
> Sent: Thursday, March 17, 2005 10:11 PM
> To: <a href="/group/PipingDesign/post?postID=G5zO5RUcGt96TQFbecpchYtgV_fIRjv0klDpADsUm9Psm3iq6ShymE6niPvxTJRooe47Y9LQsXZngXurUSm8Xb_TY0M">PipingDesign@yahoogroups.com</a>
> Subject: [PipingDesign] Curly One
>
>
>
>
> Gents + 2
>
> Last week I put in a mill feedwater system.
> It is fed from an existing shaky process warer supply. Oversized as per
> my usual practice, but am having severe (zero to 80
> m^3/h) flow fluctuations. The fluctuations are real because I can see
> where the water comes out.
>
> System is:
> Tap into existing horiz 150NB pipe (end of line), vertical.
> Up 150mm to 150NB isol butterfly valve
> Up 150mm to 150X100 reducer.
> Up 1000mm to 100NB butterfly control valve
> Up 1400m to diaphragm 100NB manual regulating valve
> Up 200mm to 100X150 reducer
> Up 200mm to vert/horiz elbow
> Across 3m to magflow.
> Up 300m through offset
> Across 1.5m to elbow
> Across 1.5m to exit
> out the end.
>
> Checked pressure at inlet and it stays within 5%
> Looked at outlet flow and its all over the place, confirmed by
> Magflow. Control valve is software locked so no control generated
> stability problems.
> There is a 100NB branch off the same line drawing 60m^3/h and its
> discharge is steady so its not a supply issue.
> Suspect the guts of the diaphragm valve is loose, and have asked it
> to be pulled out and checked. Also the control valve just to be sure.
> Never had such a problem with such a simple system before.
>
> Any suggestions?
>
> Cheers
>
> Steve
>
>
>
>
>
>
>
>
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Received on Thu Mar 17 14:57:00 2005
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