Standard: ISO - 5167
MEASUREMENT OF FLUID FLOW BY MEANS OF ORIFICE PLATES, NOZZLES AND VENTURI TUBES INSERTED IN CIRCULAR CROSS-SECTION CONDUITS RUNNING FULL
This standard is available with a subscription to IHS Standards Expert.
IHS Standards Expert subscription, simplifies and expedites the process for finding and managing standards by giving you access to standards from over 370 standards developing organizations (SDOs).FEATURES & BENEFITS
- Maximize product development and R&D with direct access to over 1.6 million standards
- Discover new markets: Identify unmet needs and discover next-generation technologies
- Improve quality by leveraging consistent standards to meet customer and market requirements
- Minimize risk: Mitigate liability and better understand compliance regulations
- Boost efficiency: Speed up research, capture and reuse expertise
HOW TO SUBSCRIBE
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,
- ISA 1932 nozzle3),
- long radius nozzle,
which differ in shape and/or in the position of the pressure tappings,
- venturi tubes :
- classical venturi tube4),
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|
|Change Type:||NEW ADDITION|
|Most Recent Revision:||YES|