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  • BSI
    BS 5857-2.1:1980, ISO 4053-I:1977 Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of gas flow - General
    Edition: 1980
    $313.97
    / user per year

Description of BS 5857-2.1:1980 1980

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 first, known as the constant rate injection method, is based on the dilution principle: a tracer solution is injected into the conduit and the dilution (ratio) of this tracer in the gas flowing in the conduit is determined, this dilution being proportional to the rate of flow.
  • — The second is a method of measurement of the transit time (formerly called Allen velocity method): the tracer is injected into the conduit and the time taken by the tracer to travel a specified length between two cross-sections in each of which it is detected, is measured.

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).



Compares the dilution method with the method based on transit time measurement. Also covers choice of tracers and measuring/mixing lengths.

Standard NumberBS 5857-2.1:1980, ISO 4053-I:1977
TitleMethods for measurement of fluid flow in closed conduits, using tracers. Measurement of gas flow - General
StatusConfirmed
Publication Date1980-03-31
Identical National Standard OfISO 4053-1:1977
DescriptorsFlow measurement, Errors, Statistical distribution, Tracer methods, Channel flow, Dilution, Measurement characteristics, Gas flow, Testing conditions, Flow, Selection, Enclosed, Radioactive tracer methods, Flow rates
ICS17.120.10 Flow in closed conduits
CommitteeCPI/30/5
ISBN0 580 11246 2
PublisherBSI
Pages18

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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