What is BS 5857-2.1 - Measurement of gas flow about?
BS 5857-2.1 is an International Standard that discusses the gas flow in closed conduits, using tracers.
BS 5857-2.1 applies to flow measurement in conduits into which a tracer is injected in such a way that effective mixing in a single phase with the gas flowing in the pipe is achieved.
The fluid in the conduit is a mixture of several gases that provide the thermodynamic state and the conditions of the flow of this mixture are well defined in BS 5857-2.1.
BS 5857-2.1 considers the adequate mixing distance. The distance between injection and measuring sections is sufficient to achieve the mixing of the tracer with the gas flowing in the conduit according to the methods.
Who is BS 5857-2.1 - Measurement of gas flow for?
BS 5857-2.1 on measurement of gas flow is useful for:
- Manufacturers of gas flow measuring meters
- Power industries, cement industries, steel, and smelters industries
- Testing laboratories
- Quality control and testing authorities
- Regulatory authorities
Why should you use BS 5857-2.1 - Measurement of gas flow?
The volumetric flow rate should be converted to standard conditions for temperature and pressure, to check gas flow effectively. It is the volume that gas occupies at atmospheric pressure (14.7 psi), which is defined as standard cubic feet per minute (SCFM).
BS 5857-2.1 is devoted to the measurement methods of gas flow. BS 5857-2.1 states two fundamental test procedures which are:
- The first, known as the constant rate injection method, is based on the dilution principle which is a tracer solution that is injected into the conduit and the dilution (ratio) of the tracer in the gas flowing in the conduit is determined
- The second is a method of measurement of the transit time (formerly called Allen velocity method) in which 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 BS 5857-2.1.
BS 5857-2.1 describes the various methods based on transit time measurement for measuring the gas flow and helps in selecting the tracers. BS 5857-2.1 also helps in the selection of measuring length and adequate mixing distance.
By adopting, BS 5857-2.1 you can learn about the methods for measurement of fluid flow in closed conduits, using tracers.