Viscosity Redwood

KINEMATIC VISCOSITY-STOKES REDWOOD VISCOSITY-SECONDS... 

Redwood viscosity—method for determining the viscosity of petroleum products it is widely used in Europe, but has limited use in the U.S. The method is similar to Saybolt Universal viscosity viscosity values are reported as "Redwood seconds."... 

In addition to kinematic viscosity, there are other methods for determining viscosity, including Saybolt Universal viscosity, Saybolt Durol viscosity, Engler viscosity, and Redwood viscosity. Since viscosity... 

Although it is considered a technical advantage to specify kinematic viscosity, the conventional viscometers are still in wide use and it may be convenient, or even necessary, to be able to convert viscosities from one system to another. Provision is made (ASTM D-2161) for the conversion of kinematic viscosity to Saybolt Universal and Furol viscosity and (in IP standards) for conversion to Redwood viscosity ... 

TABLE 2.13 Viscosity Conversion Table Centistokes to Saybolt, Redwood, and Engler units. 

Saybolt Universal Viscosity at Redwood Seconds at Engler Degrees at all Temps. 

Bunker-fuel specifications for merchant vessels are described by ASTM D 2069, Standard Specification for Marine Fuels. Deep draft vessels carry residual (e.g., No. 6 fuel oil) or distillate-residual blend for main propulsion, plus distillate for start-up, shutdown, maneuvering, deck engines, and diesel generators. Main-propulsion fuel is identified principally by its viscosity in centistokes at 373 K. Obsolete designations include those based on Redwood No. 1 seconds at 100°F (311 K) (e.g., "MD 1500 ) and the designations "Bunker A for No. 5 fuel oil and "Bunker B and "Bunker C for No. 6 fuel oil in the lower-and upper-viscosity ranges, respectively. 

V = oil fuel viscosity at handling temperature (Redwood I scale),... 

Heavy fuel oil feedstock of viscosity 900 seconds Redwood One (2.57 x 10-4 m2/s) at 100°F with the following analysis ... 

SSU Seconds Saybolt Universal SSF Seconds Saybolt Furel Kinematic Viscosity Centistokes (cSt) Seconds Redwood (standard)... 

The viscosity is then determined in the usual way with a Redwood s... 

There are other, empirical, scales in use such as SUS (Saybolt Universal Seconds) or the Redwood scales, and conversion scales are available. Base oil grades are sometimes referred to by their SUS viscosities. 

Red Ware. See Rockingham ware. Redwood Cup. An orifice-type viscometer. See flow cup. Redston-Stanworth Annealing Schedule. A procedure for determining the optimum conditions for annealing small glass articles it is based on the Maxwell model of stress release, modified to take account of the variation of viscosity with time. (G. D. Redston and J. E. Stanworth, J. Soc. Glass Tech., 32,32,1948.)... 

Figure 23 (a) Effect of adding soy lecithin [initial viscosity of plain chocolate (cocoa butter content, 34.8%), >200 s] on the viscosity of chocolate, (b) Fat and lecithin contents of chocolate of identical viscosity (42 s). (c) Effect of adding soy lecithin to suspensions of ( ) cocoa butter and (A) ground sugar in cocoa butter on viscosity. Viscosity was measured at 50°C on Bournville Redwood-type viscometer. 

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