ISO/TR 9464:2008 pdf download.Guidelines for the use of ISO 5167:2003.
Any manufacturers specification of error should be studied carefully to ensure that the limits of error are known at the measured value concerned. Some points to note include the following:
a) uncertainties are often expressed as a percentage of full scale or range:
b) uncertainties are often defined at specified reference conditions. Mditional uncertainties may arise when
operating conditions differ from reference conditions,
5.2 Guidance specific to the use of ISO 51 67-2:2003
5.2.1 Scope
This part of ISO 5157:2003 is concerned solely with orifice plates and their geometry and installation. It is necessary to read ISO 5167-2 In conjunction with ISO 5167-1.
Orifice plate meters with three arrangements of tappings are described and specified: flange tappings; corner tappings; and 1) and 1)2 tappings.
5.2.2 Normative references
No comments on this clause.
5.2.3 Terms, definitions and symbols
No comments on this clause.
5.2.4 PrInciples of the method of measurement and computation
The density and viscosity of the fluid cen be measured (see 6,4) or calculated (see Annex B) from the gas composition. A number of computer programs are available for carrying out the calculation of density and viscosity. In the case of a compressible fluid, the isentropic exponent at working conditions is necessary for the flow calculation and this can be calculated from gas composition.
52.5 Orifice plates
5.2.5.1 Description
5.2.5.1.1 General
No comments on this subclause.
a) uncertainties are often expressed as a percentage of full scale or range:
b) uncertainties are often defined at specified reference conditions. Mditional uncertainties may arise when
operating conditions differ from reference conditions,
5.2 Guidance specific to the use of ISO 51 67-2:2003
5.2.1 Scope
This part of ISO 5157:2003 is concerned solely with orifice plates and their geometry and installation. It is necessary to read ISO 5167-2 In conjunction with ISO 5167-1.
Orifice plate meters with three arrangements of tappings are described and specified: flange tappings; corner tappings; and 1) and 1)2 tappings.
5.2.2 Normative references
No comments on this clause.
5.2.3 Terms, definitions and symbols
No comments on this clause.
5.2.4 PrInciples of the method of measurement and computation
The density and viscosity of the fluid cen be measured (see 6,4) or calculated (see Annex B) from the gas composition. A number of computer programs are available for carrying out the calculation of density and viscosity. In the case of a compressible fluid, the isentropic exponent at working conditions is necessary for the flow calculation and this can be calculated from gas composition.
52.5 Orifice plates
5.2.5.1 Description
5.2.5.1.1 General
No comments on this subclause.
