BS ISO 5389:2005 pdf download.Turbocompressors ——Performance test code.
6.42.8 M.asurlng systems
Since the measured value is generally dispLayed on measuring instruments at the end of a rneasuflng system.
the rules for measunng systems specified in applicable standards. e.g. Reference 171. shall also be observed.
64.3 ConfIdence ranges for gas data
6.4.3.1 General
Whore gas composition fluctuates, particular care shale be devoted to suitable and correct sampling. The confidence ranges for gas data shall be Increased It these fluctuations exceed the ranges that can be balanced out by me of suitable sampling.
The information in 6.4.3.2 to 6.4.3.4 also presupposes suitable chemical or physical analytical methods for determination of gas composition.
6.4.3.2 Gas constant
6.4.3.2.1 Pure gases
Where the gas constant is taken from recognized equations of state. its confidence range, ‘1 can be nored,
6.4.3.2.2 Gas mixtures
The confidence range. v of the gas constants can be ignored, provided the conditions of 6.4.3.1 are met. If the gas constant Is determined by means of measurement of density using precision measuring instruments as specified in 5.4, a relative confidence range 1R1 of ±0.5 % should be used.
6.4.3.3 CompressibilIty factor
6.4.3.3.1 Pure gases
The confidence range. P2, ot the compressibility factor can be Sound in trte reievant literature for the pure gases most commonly compressed; see Reference (9J.
Where the cornpressib.ly factor Is determined usWtg equations of state, confidence range. V. should be estimated.
6.4.3.3.2 Gas mixtures
The greatest accuracy level can be acbieved by means of measurement of the compressibility factor of the gas mixture.
For the estimation of me confidence range of a compressibility factor determined from equations of state. it is pflnclpally the confidence range. l,. of the compressibility factor of the component occuplng the greatest proportion by volume and the confidence range. V, of the component vAiose compressibility factor most greatly deviates from 1 that should be used.
Since the measured value is generally dispLayed on measuring instruments at the end of a rneasuflng system.
the rules for measunng systems specified in applicable standards. e.g. Reference 171. shall also be observed.
64.3 ConfIdence ranges for gas data
6.4.3.1 General
Whore gas composition fluctuates, particular care shale be devoted to suitable and correct sampling. The confidence ranges for gas data shall be Increased It these fluctuations exceed the ranges that can be balanced out by me of suitable sampling.
The information in 6.4.3.2 to 6.4.3.4 also presupposes suitable chemical or physical analytical methods for determination of gas composition.
6.4.3.2 Gas constant
6.4.3.2.1 Pure gases
Where the gas constant is taken from recognized equations of state. its confidence range, ‘1 can be nored,
6.4.3.2.2 Gas mixtures
The confidence range. v of the gas constants can be ignored, provided the conditions of 6.4.3.1 are met. If the gas constant Is determined by means of measurement of density using precision measuring instruments as specified in 5.4, a relative confidence range 1R1 of ±0.5 % should be used.
6.4.3.3 CompressibilIty factor
6.4.3.3.1 Pure gases
The confidence range. P2, ot the compressibility factor can be Sound in trte reievant literature for the pure gases most commonly compressed; see Reference (9J.
Where the cornpressib.ly factor Is determined usWtg equations of state, confidence range. V. should be estimated.
6.4.3.3.2 Gas mixtures
The greatest accuracy level can be acbieved by means of measurement of the compressibility factor of the gas mixture.
For the estimation of me confidence range of a compressibility factor determined from equations of state. it is pflnclpally the confidence range. l,. of the compressibility factor of the component occuplng the greatest proportion by volume and the confidence range. V, of the component vAiose compressibility factor most greatly deviates from 1 that should be used.
