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FOREWORD

This foreword is for information and is not part of this standard. Chapter 14, Section 3, Part 2, of the Manual of Petroleum Measurement Standards furnishes the specifications and installation requirements for the measurement of single-phase, homogeneous Newtonian fluids using concentric, square-edged, flange-tapped orifice meters. It provides the specifications for the construction and installation of orifice plates, meter tubes, and associated fittings. Users of pipe tap orifice meters are referred to Chapter 14, Section 3, Part 3, for specifications relevant to those meters. Pipe tap information for allocation measurement is contained in Chapter 20.1 "Allocation Measurement."

This standard has been developed through the cooperative efforts of many individuals from industry under the sponsorship of the American Petroleum Institute, the American Gas Association, the Gas Processors Association and Management Service, with contributions from the Chemical Manufacturers Association, the Canadian Gas Association, the Commission of the European Communities, Canada, Norway, Japan, and others.

The methods and criteria used to analyze data applied for this revision are described in the relevant white papers and GRI research reports (see references in Appendix 2-A).

API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to ensure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may conflict.

Suggested revisions are invited and should be submitted to Measurement Coordination, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005.