Abstract
PreviewISO 7194:2008 specifies velocity-area methods for measuring flow in swirling or asymmetric flow conditions in circular ducts by means of current-meters of Pitot static tubes.
ISO 7194:2008 specifies the measurements required, the precautions to be taken, the corrections to apply, and describes the additional uncertainties which are introduced when a measurement in asymmetric or swirling flow has to be made.
Only flows with a negligible radial component are considered, however. Furthermore, it is not possible to make a measurement in accordance with ISO 7194:2008 if, at any point in the measuring cross-section, the local velocity makes an angle of greater than 40° with the axis of the duct, or where the index of asymmetry Y (defined within ISO 7194:2008) is greater than 0,15.
ISO 7194:2008 deals only with instruments for measuring local velocity as defined in ISO 3354 and ISO 3966. If Pitot static tubes are used, ISO 7194:2008 applies only to flows where the Mach number corresponding to local velocities does not exceed 0,25.
-
Status: PublishedPublication date: 2008-07
-
Edition: 2Number of pages: 27
-
- ICS :
- 17.120.10 Flow in closed conduits
Buy this standard
| Format | Language | |
|---|---|---|
| std 1 145 | ||
| std 2 145 | Paper |
- CHF145
Got a question?
Check out our FAQs
Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)
Keep up to date with ISO
Sign up to our newsletter for the latest news, views and product information.