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Published byOswaldo Crain Modified over 2 years ago

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LUBRICANT&LUBRICATION

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Crude Oil GasolineKeroseneFuel OilOil Lubricant H.C. Oil Wax Aromatic S & N Contaminant Hydrocracking Catalitic Treatment psi 430 – 550 C H.C. Lube Oil Additives n-Parafin

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Chemical Additives 1. Oxidation Inhibitor (O) 2. Rust Inhibitor (R) 3. Anti Wear & Extreme Pressure (EP) 4. Friction Modifier (W ) 5. Detergent & Dispersant (D) 6. Pour-point Depressant (P) 7. Foam Inhibitor (F) 8. Viscosity Index Improver (VI)

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Tabel hal. 25

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Synthetic Oil Hydrocarbon Poly Alpha-Olefins (PAOs)

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Viscosity Y X U F Newtonian Fluid = dU/dy h F/A = U/h = (F/A) / (U/h) = Shear Stress / Shear Rate

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= Absolute Viscosity (Dyne.s/cm2 - Poise) v = Kinematic Viscosity v = / (Stoke – St) (cSt – mm2/s) = Density (grm/cm3) Saybolt Universal Seconds (SUS)

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Tabel hal, 28

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Viscosity vs Temperature log. log (v + 0.7) = A – B log T T = Temperature v = Kinematic viscosity A, B = Constants – given oil

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Vogel Equation = Viscosity-Temp. Coeff

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Viscosity Index

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L = Viscosity (40C) dari zero-VI oil H = viscosity (40C) dari 100-VI oil U = vsicosity (40C) dari Unkown-oil

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ASTM Y = Viscosity cSt(100 C) unkown oil

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Viscosity vs Pressure = Pressure-viscosity Coeff.

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Roelands Equation C = konstanta – unit (196.1 MPa atau psi) Z = 0.6 = 0.4 – 0.8 synthetic oil

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