The April 2000 revision to the API 14.3 part 2 Standard includes the results of considerable test work over the past few years.Numerous changes are noted,some of which will have major effects on users of orifice measurement.The most significant impact will be in the upstream length and flow conditioner areas.This paper will discuss most of the changes and go into some detail on the more important ones.Items not mentioned essentially remain as stated in the previous issue of the Standard.
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