Viscosity blending chart

Figure 12-7. Fuel viscosity blending chart. HIgh-vIscosIty oil = 10,000 SSU. Low-vlscoslty oll = 40 SSU.

Figure I Polysaccharide viscosity blending chart. Reprinted with the permission of Hercules, Inc., Wilmington, DE.

Figure 5. Cellulose ester viscosity blending chart.

Percentage of tow viscosity component Fig. 4-44. ASTM-type viscosity-blending chart showing one set of experimental blends. 

The blending chart in Fig. 1 in Chapter 5 shows an exponential dependence of solution viscosity on concentration, within the range of maximum measurable concentration (100%). Rheometry permits higher c, than does viscome-try. As a prerequisite to construction of a linear polysaccharide blending chart, the linear range of t sv/ci vs ci should first be established, because it is only then that the viscosity of the blend will be equal to the sum of the viscosities of the components. Each ordinate in Fig. 1 in Chapter 5 is labeled with the maximum ct of the two polysaccharides of interest or its equivalent as 100%. 

Anomalous viscosity in residual fuel oils is best shown by plotting the kinematic viscosity determined at the normal test temperature and at two or three higher temperatures on viscosity-temperature charts (ASTM D-341). These charts are constructed so that, for a Newtonian fuel oil, the temperature-viscosity relationship is linear. Nonlinearity at the lower end of the applicable temperature range is normally considered evidence of non-Newtonian behavior. The charts are also useful for the estimation of the viscosity of a fuel oil blend from knowledge of the component viscosities and for calculation of the preheat temperature necessary to obtain the required viscosity for efficient atomization of the fuel oil in the burner. 

For unknown resins, use several solvents and/or blends which appear at varying points on the chart (see Figure 1). Determine by observation which solvents will dissolve the resin. The non-volatile content should be kept low at the outset so that solubility is not masked by an overload of solute. By increasing the level of solute, the capacity of the solvent for the resin is observable. The viscosity at any solute concentration can be measured, and a cost calculation of the solvents can be made. Using... 

Petroleum Products and Lubricants, D341, ASTM, 1916 Race St., Philadelphia, Pa. Four large charts, low and high range, for Universal and for Kinematic viscosity may be purchased. The 0-100 F part of the temperature scale is used as 0-KX) per cent of blending agent. 

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