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Spoke to the guys on site and we agree with your comments, we're definitely going to change the inlet 6" pipe, we can't do much about the 10" T's, but we have a lot of flexibility with running the 6" line, so we're going for max D between the flow meter and the bend!

Thanks BigInch and Dave, Think we will drop the theory of the ejector and focus on getting the flow meter away from the bend!

Typical.... forgot to complete the upload, here's the rough sketch.http://files.engineering.com/getfile.aspx?folder=03388cdf-3cd3-4f06-9ec3-40f4d146161c&file=pipe_layout.JPG

thanks David, sounds like I can discount the ejector effect, but what you said about the "pop bottle" effect sounds worth investigating. BigInch, see enclosed the arrangement I have at present, the flow meter is 2D from the elbow. We are thinking of taking the 6" line for a walk and move...

Ah- thanks for that BigInch - the problem is that I know I am getting the flow of 125 m3/h, but the flow meter is jumping around the measurement point - I have fluctuations between 70 to 150 m3/h. We have checked the grounding on the instrument and this is fine, i also do not believe the...

I have a problem with flow measurument in two joining water lines that seems to be caused by an ejector effect at the connection. The main header is a 10 inch line with normal velocity of 1.75 m/s. I then have a 6 inch line connecting via a reducing T. After the connection the line velocity in...

Does anyone know where I can start looking for a top hat orifice design tool/ guidelines? I have an application where we have to take quite a large pressure drop in a water line and I believe I might be able to get away with less cavitation if I use a top hat style design.

Thanks, will dig out the old material properties handbook!

Thanks, my experience has been a bit ropey with stainless corroding in seawater systems, so prefer plastic nozzles although they do suffer from wear and tear (Super duplex or hasteloy simply isn't an option). If I convert the 1 nozzle per square foot to metric this is about 10 per m2, Any...

Does anyone have a rule of thumb for the density of filtration nozzles per m2 for a pressurized dual media filter with a nozzle floor design? The filter will be operating on seawater feed.

Hi Burtis, What is it you are trying to filter, what's your medium, are you protecting anything such as RO or just want a high purity filtrate? Agree with sbush, have a look under the membrane forum, your'e bound to find something of interest there.

Can ayone advise what the major differences between the API 598 and DIN 3230 part 3 for valve testing are? Is the DIN standard more onerous?