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8. Notes on some flowmeters for closed pipes
The remarks that follow provide some pointers.
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Orifice flowmeters
For all these flowmeters, the density of the fluid must be known, even if the mass flow rate is not being measured. In the case of gases, if high accuracy is required, it may be necessary to use standard temperature and pressure measurements, or to measure density directly. These are the only flow rates fully defined by a standard (ISO 5167).
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Orifice plate
Some orifice plate models, such as diaphragms, are interchangeable, sometimes under pressure, without stopping the unit. Worn orifice...
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Notes on some flowmeters for closed pipes
Contractual aspects
Bibliography
Standards and norms
French Standards Association (AFNOR)
- Flow measurement of fluids by means of depressors inserted in loaded pipes of circular cross-section – Part 1: General principles and requirements - NF EN ISO 5167-1 - 2003
- Flow measurement of fluids by means of depressors inserted in loaded pipes of circular cross-section...
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