Measurement of Liquid Flow in Closed Conduits Using Transit-Time

Ultrasonic Flowmeters

A N A M E R I C A N N A T I O N A L S T A N D A R D

ASME MFC-5.1–2011

(Revision and Partition of ANSI/ASME MFC-5M–1985)

ASME MFC-5.1–2011

(Revision and Partition of ANSI/ASME MFC-5M–1985)

Measurement of Liquid Flow in Closed Conduits Using Transit-Time Ultrasonic Flowmeters

AN AMERICAN NA TIONAL S T AND ARD

Three Park Avenue • New York, NY • 10016 USA

Date of Issuance: June 17, 2011

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CONTENTS

Foreword iv

Committee Roster v

Correspondence With the MFC Committee vi

1. General 1

2. General Ultrasonic Flowmeter Descriptions 2

3. Transit-Time Flowmeter Descriptions 2

4. Uncertainty Sources and Uncertainty Reduction 7

5. Installation and Selection Guidelines 10

6. Calibration, Verification, and Diagnostics 11

Figures

1. Wetted Transducer Configurations 3

2. Protected Configuration With Both an External Mount and a Wetted Smooth

   Bore 5

3. Acoustic Path Configurations 6

4-1 A Typical Cross Path Ultrasonic Flowmeter Configuration 9

Tables

1. Symbols 3

2. Subscripts 3

iii