Standard: ISO - 5167

MEASUREMENT OF FLUID FLOW BY MEANS OF ORIFICE PLATES, NOZZLES AND VENTURI TUBES INSERTED IN CIRCULAR CROSS-SECTION CONDUITS RUNNING FULL

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Scope:

SCOPE AND FIELD OF APPLICATION

This International Standard specifies the geometry and method of use (installation and operating conditions) of orifice plates, nozzles and venturi tubes when they are inserted in a conduit running full, to determine the rate of the fluid flowing in the conduit. It also gives necessary information for calculating the flow-rate and its associated uncertainty.

This International Standard applies only to pressure difference devices in which the flow remains subsonic throughout the measuring section, is steady or varies only slowly with time and the fluid is single-phased. In addition, each of these devices can only be used within limits which are specified, for example of pipe size and Reynolds number. Thus this International Standard cannot be used for pipe sizes less than 50 mm or more than 1 200 mm or for pipe Reynolds numbers below 3150.

It deals with devices for which direct calibration exper· iments have been made, sufficient in number and quantity to enable coherent systems of application to be based on their results and coefficients to be. given with certain predictable limits of uncertainty.

The devices introduced into the pipe are called "primary devices". The term primary device also includes the pressure tappings. All. other instruments or devices required for the measurement are known as "secondary devices". This International Standard covers the primary devices; secondary devices 1) will be mentioned only occasionally.

The different primary devices dealt with in this International Standard are as follows :

- orifice plates, which C:an be used with the various following arrangements of pressure tappings :

corner pressure tappings,

- D and D/2 pressure tappings,2) 

- flange pressure tappings,

- nozzles:

- ISA 1932 nozzle3),

- long radius nozzle,

which differ in shape and/or in the position of the pressure tappings,

- venturi tubes :

- classical venturi tube4),

- venturi-nozzle,

which differ in shape and/or in the position of pressure tappings.

1) See ISO 2186, Fluid flow in closed conduits - Connections for pressure signal transmission betwt1enprimary and secondarv devices.

2) Orifice plates with vena contracta pressure tapping$ are not considered in this International Standard.

3) ISA is the abbreviation for "International Federation of the National Standardizing Associations", the body which was succeeded by ISO in 1946.

4) In the U.S.A. the classical venturi tube is sometimes called Herschel venturi tube

Organization: International Organization for Standardization
Document Number: 5167
Publish Date: 1980-01-01
Page Count: 70
Change Type: NEW ADDITION
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: YES
Status: Inactive

Standards That Reference This Standard

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