Project Details:

International standard for viscosity at temperatures up to 473 K and pressures below 200 MPa

There are two independent projects attempting to determine a standard for viscosity with a nominal value of about 20 mPa×s at temperatures of 473 K and pressure of 200 MPa: one within Europe the other North America. This proposal will link these otherwise independent activities and provide one International standard.

The research will select fluids that are suitable for the intended purpose and determine the viscosity with instruments that have different sources of systematic error. The results will be combined to determine the proposed standard viscosity including the expanded uncertainty. 

 

The industrial requirement is for a viscosity standard with a nominal value of 20 mPa·s at a temperature of 473 K and pressure of 200 MPa and a relative expanded uncertainty of <±5 %. The viscosity and density must be known over a range of temperature and pressure. There are no commercially available certified viscosity reference liquids that fulfill this requirement. The viscosity will be determined at 6 locations with apparatus that have different sources of systematic error and the results combined with a statistical analysis to provide the standard values and relative expanded uncertainty. Fluid that plausibly fulfill the requirements have been identified. Measurement will be performed to select a fluid for which independent measurements will then be performed in both Europe and America. 

The Task Group has its first meeting during the PPEPPD 2013 (May 26-30) in Iguazu Falls, Argentina.

 

Last update 31 May 2013

• Goodwin, Anthony

• Assael, Marc
• Enick, R.
• Fernandez, J.
• Trusler, J. P.