Menentukan Material Factor Berdasarka

ctor Berdasarkan Index

Ethyline memiliki Mf : 2
thyline memiliki Mf : 24
 Evaluate the process unit to eliminate over estimating penalties:
General Process Hazards (F1)

For Example : Ethylene

1 General Process Hazards

Base Factor
p-16 A Exothermic Chemical Reactions Type = None
p-17 B Endothermic Processes Type = None
p-17 C Material Handling & Transfer (Table 1) Type = None
p-17 D Enclosed or Indoor Process Units Type = Open
p-18 E Access Type = Two Sides
p-18 F Drainage and Spill Control Notes Meets NFPA 30? No USG =
General Process Hazards Factor (F1) =
penalties:

Penalty Penalty
Factor Factor
Range Used
1.00 1.00
0.3 - 1.25 0.00
0.2 - 0.4 0.00
0.25 - 1.05 0.00
0.25 - 0.9 0.00
0.2 - 0.35 0.00
No USG = 1.73E+05 0.25 - 0.5 0.50
1.50
 Evaluate the process unit to eliminate over estimating penalties:
Special Hazards (F2)

2 Special Process Hazards

Base Factor =
p-20 A Toxic Material(s), Use (0.2)(Nh) Nh = 1.00 Note
p-20 B Sub-Atmospheric Pressure (<500 mm Hg) Possible vacuum? No P
p-21 C Operation Near In or Near Flammable Range Padding? None P
p-21 1 Tank Farms Storage Flammable Liquids Note C1:
p-21 2 Process Upset or Purge Failure Note C2:
p-21 3 Always in Flammable Range Note C3:
p-21 D Dust Explosion (See Table 3) Type = None Micron Sz = 0 Inerted?
p-22 E Pressure (See Fig. 2) Operating Psig = 58.4 Relief Set psig =
p-25 F Lowest Temperature = -155 F Material Suitable ? = Yes
p-25 G Quantity of Flammables / Unstable Material lb = 217,000 Heat Comb BTU/lb =
p-26 1 Liquids or Gases In Process (See Fig. 3) Penalty =
p-28 2 Liquids or Gases in Storage (See Fig. 4) Type = A Penalty =
p-30 3 Combustible Solids in Stg (See Fig. 5) lbs = 0 Density =
p-32 H Corrosion and Erosion Rates = 0.00 mil / Yr. Penalty =
p-33 I Leakage - J oints and Packing Type = Minor Penalty
p-33 J Use of Fired Equipment (See Fig. 6) Dist = 600 ft. Penalty C
p-35 K Hot Oil Heat Exchange System (See Table 5) Volume = 0.00 Penalty
p-36 L Rotating Equipment Type = Comp Penalty
Special Process Hazards Factor (F2)
Process Unit Hazards Factor (F1 x F2) =F3 =

Fire and Explosion Index (F3 x MF =FEI) =

Fire and Explosion Class (See Table 6) = FEI Range = 128 - 158
penalties:

1.00 1.00
Note 0.2 - 0.8 0.20
cuum? No Penalty 0.50 0.00
one Penalties
0.50 0.00
0.30 0.00
0.80 0.00
0 Inerted? No 0.25 - 2.0 0.00
elief Set psig = 125 0.16 - 1.5 0.24
ble ? = Yes 0.2 - 0.3 0.00
eat Comb BTU/lb = 20,800
Penalty = 2.18 2.18
A Penalty = 0.96 0.00
0 Density = 0 0.00
Penalty = 0.00 0.1 - 0.75 0.00
Penalty 0.1 - 1.50 0.10
Penalty Curve A-2 0.10
0.00 Penalty 0.15 - 1.15 0.00
Penalty 0.50 0.50
4.32
6.47

155.36

128 - 158 Heavy

F3 = F1 X F2
F3 = 1.5 X 4.32
F3 = 6.48
 F & EI USED TO DETERMINE:
An area having a potential for impact from a flammable or over pressure ev

F & EI = Material Factor X F3

1 - 60 Light

61 - 96 Moderate

97 - 127 Intermediate

128* - 158 Heavy

159+ Severe
Hazard

e
Area Exposure : Berdasarkan FEI 155.52 exposure akan
mempengaruhi hingga Radius 130 ft
ure akan
 Determine damage factor from empirical relationship of Unit Hazard (F3) a
Material Factor (MF)
Figure 8 - Damage Factor

1.200

1.000
Da m a g e F a cto r

0.800

0.600

0.400

0.200

0.000
0 5 10 15 20 25 30 35 40 4
Material Factor (MF)
Unit Hazard (F3) and

F3 = 6.48
MF = 24
F3 = 1
Damage Factor = 0.85
F3 = 2
F3 = 3
F3 = 4
F3 = 5
F3 = 6
F3 = 7
F3 = 8
Case Pt.

35 40 45
 Base Maximum Probable Property Damage (Base MPPD)

= Value of the area of exposure X Damage Factor

Area exposure diasumsikan berbentuk lingkaran sehingga