Fully Developed Flow Past Orifice Plate: 20-40x Diam.

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The distance required for fluid to achieve fully developed flow past an orifice plate is generally accepted to be 20 to 40 times the diameter of the constriction. However, for accurate calculations, a standard of 15 diameters of the pipe's internal diameter is recommended downstream of the orifice before any disruptions occur. This requirement can vary based on the beta ratio, with specific guidelines provided in ASME specifications. Users seeking more information can refer to the ASME website for relevant tables and documents, although some have reported difficulty finding these resources. Overall, understanding these specifications is crucial for accurate fluid measurement and flow analysis.
Isoho
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Hi!

what is the distance that a fluid has to go to become fully developed flow past an orifice plate pressure meter?

I have read somewhere that it is 20 to 40 times the diameter of the constriction. Is this correct?
 
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The standard one has to follow for printed calculations to be valid is 15 diameters of the pipe ID, not the orifice diameter, downstream before any kind of disruption or change in flow path for. This does depend on beta ratio however. There is a table in the ASME specs that spells this out and gives the ranges required.
 
Thanks Fred!

I was wondering where you sourced that information from as I have just been on the ASME website and found a few papers relating to the matter but I was unable to find the table that you mention? (my beta number is 0.66). I would also really like to read up on the factors behind the 15D if you have any web links to how you know that.

Thank you for your help already though!
 

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