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Typical Overall Heat Transfer Coefficients

Refining Applications

Alkylation

Range, (Btu/h.ft².°F)
Debutanizer Condenser 75 90
Debutanizer Reboiler (STM) 85 100
Deisobutanizer Feed Preheater (STM) 75 100
Deisobutanizer Condenser 80 90
Deisobutanizer Reboiler (STM) 90 100
Depropanizer Feed Preheater (STM) 90 100
Depropanizer Condenser 90 100
Depropanizer Reboiler (STM) 75 95
Depropanizer Feed/Btms Exchanger 60 80
Olefin Feed Chiller 70 80
Refrigeration Condenser 90 100
Rerun Tower Preheater (STM) 60 80
Rerun Tower Condenser 65 80
Rerun Tower Reboiler (STM) 80 100
Rerun Tower Bottoms Cooler 50 70

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Amine Treating

Range, (Btu/h.ft².°F)
Rich/Lean Amine Exchanger 75 90
Regenerator Condenser 70 90
Regenerator Reboiler (STM) 100 120
Lean Amine Cooler 80 90

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Catalytic Cracking

Range, (Btu/h.ft².°F)
Naphtha Cooler 55 65
Feed / DFO 35 45
DFO Cooler 45 55
DFO Cooler (300-400 °F) 80 100
Gas Oil / DFO 40 50
Gas Oil / Quench 35 50
Gas Oil / Tar 30 40
Quench or STB / Feed 35 45
Quench / BFW 60 80
Quench or STB Cooler 30 50
Quench and/or STB Cooler (300-400 °F) 50 70
Quench Steam Gen. 70 90
Reduced Crude / Quench 35 45
Reduced Crude / Tar Sep. Btms. 30 40
SYN Tower Condenser 30 40

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Crude Distillation

Range, (Btu/h.ft².°F)
Crude / Heavy Gas Oil 40 50
Crude / Kerosene 35 45
Crude / Light Gas Oil 40 50
Crude / Naphtha 40 50
Crude / Reduced Crude 25 35
Crude / Vac. Tar 25 30
Heavy Gas Oil Cooler 50 50
Heavy Gas Oil Steam Gen. 100 120
Kerosene Cooler 55 65
Light Gas Oil Cooler 45 55
Lube Dist. / Crude 40 50
Naphtha Cooler 60 70
Reduced Crude / Gas Oil 35 45
Reduced Crude / Naphtha 40 50
Reduced Crude Cooler 20 30
Tower Overhead / Crude 30 40
Tower Condenser 45 55
Vac. Tar / Steam Gen. 45 55
Vac. Tar Cooler (box) 10 20

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Hydrodesulfurization

Range, (Btu/h.ft².°F)
Charge / Reactor Effluent 60 70
Charge / Gas Oil Product 55 65
Charge / HTS Off Gas 50 60
HTS Off Gas / Water Condenser 75 85
Stripper Feed / Gas Oil Product 55 65
Stripper Bottoms Cooler 65 75
Stripper Condenser 55 65
Total Gas / Gas Oil Product 55 65

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Light Ends Processing

Range, (Btu/h.ft².°F)
Absorber Intercooler 60 70
Compressor Contactor Cooler 75 90
Deethanizer Condenser 80 100
Deethanizer Reboiler 80 100
Debutanizer Feed / Btms 60 70
Debutanizer Feed Preheater (STM) 80 100
Debutanizer Condenser 75 90
Debutanizer Condenser Aftercooler 40 50
Debutanizer Reboiler (STM) 80 100
Depropanizer Feed / Btms 70 90
Depropanizer Condenser 90 100
Depropanizer Reboiler (Hot Oil) 55 65
Depropanizer Reboiler (STM) 80 100
Fractionating Abs. Reboiler 75 90
Gasoline Cooler 70 80
Lean Oil / Rich Oil Exchanger 45 55
Lean Oil Cooler 60 70
Propane and/or Butane Cooler 75 85
Stabilizer Btms. / Feed 65 75
Stabilizer Condenser 70 90
Stabilizer Reboiler 75 100

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Lube & Wax Processing

Extraction Range, (Btu/h.ft².°F)
Solvent Vapor / Extract Mix (75% Solvent) 225
Treating Tower Intercooler 60 100
Solvent / Charge Oil 20 40
Solvent Water Cooler 90
Raffinate Oil / Raffinate Oil Mix 20 60
Raffinate Oil / Water Cooler 25 60
Solvent / Raffinate Oil Mix 30
Raffinate Oil Mix / Steam 35
Raffinate Oil Mix / Steam Evaporator (80% Solvent) 90
Raffinate Oil Mix / Steam Evaporator (45% Solvent) 70
Raffinate Oil Mix / Steam Evaporator (13% Solvent) 40
Atmospheric Solvent Vapors / Extract Mix 60
Extract / Water Cooler (Submerged Coil) 10 15
Dry Solvent Vapor (Vacuum) / Water Condenser (+Subcooling) 60
CBM / Water Condenser (Subcooling to 150°F) 120
Vacuum Pump Aftercooler 10
Steam / Steam Superheater 15
Extract Mix / Steam Evaporator (80% Solvent) 90
Extract Mix / Steam Evaporator (45% Solvent) 70
Extract Mix / Steam Evaporator (13% Solv ent) 40
Extract Mix / Solvent Vapor (80% Solvent) 90 115
Extract Mix / Solvent Vapor (45% Solvent) 55
Extract Mix / Solvent Vapor (13% Solvent) 35
Wet Solvent Vapor (Vacuum) / Water Condenser (+Subcooling) 105
Extract Mix (10% Solvent) / Extract Mix (80% Solvent) 15
Dewaxing
Cold Pressed Oil Mix / Solvent 30
Cold Slack Wax Mix / Steam 45
Flue Gas / Ammonia Chiller 6 10
Flue Gas / Water Cooler 10 20
Hot Solvent / Wax Oil 65
Pressed Oil / Pressed Oil Mix 30 40
Pressed Oil / Water Cooler (to 150°F) 25
Slack Wax / Slack Wax Mix 30
Solvent / Ammonia Chiller 60
Solvent / Cold Slack Wax Mix 10
Solvent / Water Cooler (5# delta P) 90
Solvent / Water Cooler (1# delta P) 70
Solvent Vapor / Pressed Oil Mix 45 100
Solvent Vapor / Slack Wax Mix 65
Solvent Vapor / Pressed Oil 80
Solvent Vapor / Pressed Oil 90
Solvent Vapor / Slack Wax Mix (3:1 Solvent Ratio) 80
Solvent Vapor / Slack Wax Mix (4:1 Solvent Ratio) 90
Solvent Vapor / Water Condenser (No Subcooling) 100
Steam / Steam Superheater 15
Steam / Pressed Oil (2:1 Solvent Ratio) 15 70
Steam / Pressed Oil (3:1 Solvent Ratio) 35 100
Steam / Pressed Oil (4:1 Solvent Ratio) 125
Steam / Slack Wax Mix (1:2 Solvent Ratio) 15 70
Steam / Slack Wax Mix (2:1 Solvent Ratio) 60
Steam / Slack Wax Mix (3:1 Solvent Ratio) 70
Steam / Slack Wax Mix (4:1 Solvent Ratio) 125
Warm Wash Heater 100
Wax Oil Mix / Ammonia DP Chiller (with Scrapers) 30
Wax Oil Mix / Ammonia DP Chiller (without Scrapers) 20
Wax Oil Mix / Pressed Oil Mix DP Exchanger 15 20
Wax Oil Mix / Water Cooler 30
Wet Solvent Vapor Condenser (with Subcooling) 75

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Naphtha Hydrotreating & Reforming

Range, (Btu/h.ft².°F)
Pretreater Reactor Effluent / Charge (Cold End) 65 75
Pretreater Reactor Effluent / Charge (Hot End) 70 80
Pretreater Reactor Effluent Condenser 80 90
Naphtha Splitter Feed / Botomms 65 80
Naphtha Splitter Condenser 65 75
Reactor Effluent Condenser 80 100
Reactor Effluent / Feed (Cold End) 70 85
Reactor Effluent / Feed (Hot End) 80 90
Splitter or Stripper Feed / Pretreater Effluent 75 85
Stabilizer Reboiler (Hot Oil) 75 95

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Thermal Cracking

Range, (Btu/h.ft².°F)
Coker Combination TWR Condenser 40 50
Gas Oil / Gas Oil 30 40
G.O. Cracker O'hd Condenser 45 65
Gas Oil Reflux Steam Gen. 80 90
Gasoline / Naphtha Charge 60 80
Thermal Tar Cooler (box) 10 20
Thermal Tar Steam Gen. 40 50
Top Reflux / BFW 60 80
Top Reflux / Naphtha 60 80
Top Reflux / Naphtha Charge 50 60
Top Reflux Cooler 55 65

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