Crude Distillation Unit-I
Presented By: Mrinal Patowary,PNM
Date: 08/03/2022
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Areas under CDU-I
✓ PH-I and Related Tank Farm
✓ CDU-I Unit
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Pump House-1 and related Tank Farm
✓ Crude ,RCO and Slop pumps
✓ Crude ,RCO and Slop Tanks
✓ Melting Pit
✓ Refinery Flare
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Pump House-1 and related Tank Farm
•Pump House-1
Service fluid Tag No. Capacity (m3/hr)
11-P-01A/C/D/E 218
Crude
11-P-01B 168
47-P-02A/B 75
RCO
47-P-02C/D 80
47-P-401/402 15
SLOP
47-P-04A/B 44
• Tank Farm Area
Tank No. Type Capacity (KL)
501,502,503,504,507 Crude (Imported) 20,000
505,506 Crude (Assam) 20,000
801,802,803,804 RCO 10,000
808,809 RCO 5,000
805,806,807 SLOP 1,000
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CDU-I
Commissioned on : 6th Feb,1979
Capacity : 1.35 MMTPA
Technology : EIL
Fractionation (Distillation): Separation of crude oil in a distillation column into
groups of hydrocarbon compounds of different boiling-point ranges called
"fractions" or "cuts”.
Feed to unit: Crude Oil
Products:
❖ LPG
❖ SRN (Straight Run Naphtha)
❖ RFN (Reformer Feed Naphtha)
❖ KC (Kero Component)
❖ Kero-I
❖ Kero-II
❖ SRGO (Straight Run Gas Oil)
❖ RCO (Reduced Crude Oil)
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Process Flow Diagram
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Critical Equipments and their functions
Equipment Function
Exchanger Transfers heat from one fluid to another
Desalter Reduces the salt content of crude
Furnace Heats crude to high temperature required for it
to flash in the fractionator
Fractionator Separates crude into different fractions
Stripper Removes light components from the products
Stabilizer Separates LPG from heavy naphtha
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Critical Process Parameters
Parameter Design Range Unit
Preheat Temperature 258-269 ̊C
Furnace COT 355-365 ̊C
Fractionator Top
Temperature 140-145 ̊C
Fractionator Pressure 1-1.2 Kg/cm2
Stabilizer Top
Temperature 64-67 ̊C
Stabilizer Bottom
Temperature 190-204 ̊C
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Product Specifications
Product Specification Range Unit
Weathering -2 to +2 ̊C
Not worse
LPG
Cu-strip Corrosion Test than Class I -
Lead Acetate Test Clear -
SRN 45-115 ̊C
IBP- FBP
RFN 118-155 ̊C
Flash Point >39 ̊C
KC
Smoke Point >= 18 mm
Flash Point >= 44 ̊C
K-I
Smoke Point >= 17 mm
K-II Flash Point >= 66 ̊C
Dependant on
Gas Oil Recovery DHDT demand %
RCO Recovery <10 %
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Utilities
✓ Raw Water
✓ Cooling Water
✓ Plant Air
✓ Instrumentation Air
✓ Flare
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