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Online Viscosity Systems. Multi-curve Referral. Temperature Vs. Kinematic Viscosity: ASTM D341. log.log ( v + 0.7) = A-BlogT v = kinematic viscosity; cst T = temperature deg Kelvin. using ASTM D341 log.log (v + 0.7) = A-BlogT. two process variables kinematic viscosity (cst)

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Online Viscosity Systems

Multi-curve Referral

temperature vs kinematic viscosity astm d341
Temperature Vs. Kinematic Viscosity: ASTM D341

log.log (v + 0.7) = A-BlogT

v = kinematic viscosity; cst

T = temperature deg Kelvin

using astm d341 log log v 0 7 a blogt
using ASTM D341 log.log (v + 0.7) = A-BlogT
  • two process variables
    • kinematic viscosity (cst)
    • temperature (OK)
  • two constants A & B
  • therefore with two sets of calibration data.... A&B can be found
calculations
Calculations

log.log (v + 0.7) = A-BlogT........(i)

let v = 128.58cst at 40 OC

log.log (129.28) = A-Blog(313).............(ii)

let v = 15.00 cst at 100 OC

log.log (15.70) = A-Blog(373)...............(iii)

(ii) - (iii) and solve for B: B=3.24

substitute B in (ii) and solve for A

log.log (15.70) = A-3.24log(373).............(iv)

calculating base viscosity
calculating base viscosity
  • now substitute A and B in (i)
  • log.log (v + 0.7) = 8.41-3.24logT........(v)
  • and now:
    • enter the temperature of interest in T, e.g. 50 OC, the base temperature
    • find v
  • log.log (v + 0.7) = 8.41-3.24log(323)
  • v = 80.0cst at 50 OC
the multi curve method
the multi-curve method
  • for products where quality changes dramatically
  • for multiple products
  • combines ASTM equation with ratio technique
  • for bunker monitoring and blending control
heavy fuel oils
Heavy Fuel Oils

Calibration Curves

Product Curve

Viscosity

Temperature

determining base viscosity

The viscosity at the base temperature

Find the calibration curve viscosities at the base temperature and then apply the ratios to find the viscosity for the process curve

a

Find the Ratio of calibration curve viscosities at the process temperature to the measured value

Viscosity measured at process temperature

b

a

a

b

b

determining base viscosity

Logarithmic scale