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Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of gas flow -- General
This International Standard deals with the measurement of gas flow in conduits by using tracer methods.
In a steady flow of compressible fluid, the only conservative parameter is the mass rate of flow qm. Therefore the whole of this International Standard will refer to mass rate of flow qm.
However, for those fluids for which the composition (and therefore, the mass density) may not be known accurately, the volume rate of flow qv could be measured, it being understood that this volume rate of flow is only valid for the conditions of temperature and pressure at which it has been measured.
This International Standard applies to flow measurement in conduits into which a tracer can be injected in such a way that effective mixing in single phase with the gas flowing in the pipe can be achieved.
The fluid in the conduit can be a mixture of several gases provided the thermodynamic state and conditions of flow of this mixture are well defined.
Two fundamental test procedures are used:
The advantages and disadvantages of these two methods are considered in clause 4. The distance between injection and measuring sections shall be sufficient to achieve mixing of the tracer with the gas flowing in the conduit according to the methods; the adequate mixing distance is considered in clause 6.
A large number of different tracers may be used, such as radioactive or non-radioactive, mineral or organic materials. The choice of tracer depends on the circumstances of the measurement (see clause 5). The uncertainty of the measurements may be less than 1 % under good conditions (see clause 7).
| SDO | BSI: British Standards Institution |
| Document Number | 5857-2.1 |
| Publication Date | March 31, 1980 |
| Language | en - English |
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| Committee | CPI/30/5 |