Sökning - 3 resultat för 'TK 413'

Kommittébeteckning: SIS/TK 413 (Provning av flytande och gasformiga bränslen)
Källa: CEN
Svarsdatum: den 27 dec 2022
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This document specifies Procedure A, using manual glass viscometers, and Procedure B, using glass capillary viscometers in an automated assembly, for the determination of the kinematic viscosity, ν, of liquid petroleum products, both transparent and opaque, by measuring the time for a volume of liquid to flow under gravity through a calibrated glass capillary viscometer. The dynamic viscosity, η, is obtained by multiplying the measured kinematic viscosity by the density, ρ, of the liquid. The range of kinematic viscosities covered in this test method is from 0,2 mm2/s to 300 000 mm2/s over the
temperature range –20 °C to +150 °C.
NOTE The result obtained from this document is dependent upon the behaviour of the sample and is intended for application to liquids for which primarily the shear stress and shear rates are proportional (Newtonian flow
behaviour). If, however, the viscosity varies significantly with the rate of shear, different results can be obtained from viscometers of different capillary diameters. The procedure and precision values for residual fuel oils,
which under some conditions exhibit non-Newtonian behaviour, have been included.

Kommittébeteckning: SIS/TK 413 (Provning av flytande och gasformiga bränslen)
Källa: ISO
Svarsdatum: den 27 dec 2022
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This International Standard specifies a method for the determination, using an oscillating U-tube density meter, of the density of crude petroleum and related products within the range 600 kg/m3 to 1 100 kg/m3 which can be handled as single-phase liquids at the test temperature and pressure.
This International Standard is applicable to liquids of any vapour pressure as long as suitable precautions are taken to ensure that they remain in single phase. Loss of light components will lead to changes in density during both the sample handling and the density determination.
This method is not intended for use with in-line density meters.

Kommittébeteckning: SIS/TK 413 (Provning av flytande och gasformiga bränslen)
Källa: CEN
Svarsdatum: den 27 dec 2022
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This document covers statistical methodology for assessing the expected agreement between two test methods that purport to measure the same property of a material, and deciding if a simple linear bias correction can further improve the expected agreement.
This document is used for analytical methods which measure quantitative properties of petroleum or petroleum products resulting from a multi-sample-multi-lab study (MSMLS). These types of studies include interlaboratory studies (ILS) meeting the requirements of ISO 4259-1 or equivalent and
proficiency testing programs (PTP) meeting the requirements of ISO 4259-3 or equivalent, but is not limited to these data providers as long as the data quality requirements are met.
A methodology is presented for establishing the limiting value, designated as the between-method reproducibility. This value is expected to be exceeded with a probability of 5 % under the correct and
normal operation of both test methods due to random variation for the difference between two results where each result is obtained by a different operator using different apparatus and each applying one of the two methods X and Y on identical material of the result of the X-method has been appropriately bias-corrected in accordance with this practice.
NOTE Further conditions for application of this methodology are given in 5.1 and 5.2.