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LUBRICANT LUBRICANT &&
LUBRICATIONLUBRICATION
Crude Oil
Gasoline Kerosene Fuel Oil Oil Lubricant
H.C. Oil
Wax AromaticS & N
Contaminant
Hydrocracking
Catalitic Treatment
1000-3000 psi
430 – 550 C
H.C. Lube Oil
Additives
n-Parafin
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)
Tabel hal. 25
Synthetic Oil
Hydrocarbon Poly Alpha-Olefins (PAOs)
Viscosity
Y
X
UF
Newtonian Fluid = dU/dy
h
F/A = U/h = (F/A) / (U/h)
= Shear Stress / Shear Rate
= Absolute Viscosity (Dyne.s/cm2 - Poise)
v = Kinematic Viscosity
v = / (Stoke – St)
(cSt – mm2/s)
= Density (grm/cm3)
Saybolt Universal Seconds (SUS)
SUS
SUSvityVisKinematic
180)(22.0)(cos
Tabel hal, 28
Viscosity vs Temperature
log. log (v + 0.7) = A – B log T
T = Temperature
v = Kinematic viscosity
A, B = Constants – given oil
T
BA
''log
Tbea /''
Vogel Equation
)( refTTref e
= Viscosity-Temp. Coeff
12
12 )/ln(
TT
Viscosity Index
HL
ULVI
L = Viscosity (40C) dari zero-VI oil
H = viscosity (40C) dari 100-VI oil
U = vsicosity (40C) dari Unkown-oil
ASTM
Y
UHN
NantiVI
log
loglog
10000715.0
1)log(
Y = Viscosity cSt(100 C) unkown oil
Viscosity vs Pressure
P
e P
0
0
ln
= Pressure-viscosity Coeff.
Roelands Equation
Z
C
P
1)2.1(log2.1log 0
C = konstanta – unit (196.1 MPa atau 28440 psi)
Z = 0.6 = 0.4 – 0.8 synthetic oil
)864.0885.0(
)2.1)log(log
)2.1)log(log
81.7
4040
100100
4040
405.1
10040
HF
H
H
FHHz
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