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About This Item


Full Description

This document describes the background and development of the equation for the coefficient of discharge of flange-tapped square-edged concentric orifice meters and recommends a flow rate calculation procedure. The recommended procedures provide consistent computational results for the quantification of fluid flow under defined conditions, regardless of the point of origin or destination, or the units of measure required by governmental customs or statute.

The procedures allow different users with different computer languages on different computing hardware to arrive at almost identical results using the same standardized input data.

Document History

  1. API MPMS Chapter 14.3.4


    Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters, Part 4: Background, Development, Implementation Procedure, and Example Calculations, Fourth Edition

    • Most Recent
  2. API MPMS Chapter 14.3 Part 4 (R2011)

    Natural Gas Fluids Measurement: Concentric, Square-Edged Orifice Meters - Part 4: Background, Development, Implementation, Procedures and Subroutine Documentation

    • Historical Version