I:\Design\Fired Heater Cepu\1500 BOPD\CONVECTION BARE TUBE.htri

API 530 Tube Thickness Design Page 1Released to the following HTRI Member Company: CV. Alpha Omega Mohammad Firmansyah

MKH Units CONVECTION COIL (BARE TUBE)VERTICAL CYLINDRICAL FIRED HEATER

TitleElastic design pressure (kgf/cm2G) 10.544Max operating pressure (Start of Run) (kgf/cm2G) 10.544Max operating pressure (End of Run) (kgf/cm2G) 10.544Metal temperature (Start of Run) (C) 471.10Metal temperature (End of Run) (C) 471.10Temperature allowance for design (C) 13.9Maximum local flux (OD) (kcal/hr m2) 82000.0Design life for stress (hr) 100000.Corrosion allowance (mm) 3.175Corrosion rate (mm/year) 0.278Run length (yr) 1.

Design ResultsType of metal (-) FerriticOutside diameter (mm) 60.325Average inside diameter (mm) 47.879Piping schedule (-) S80Average wall thickness (mm) 6.223Minimum wall required (mm) 6.223Sound metal thickness @ final conditions (mm) 3.048Metal weight (kg/mm) 8.199e-3Corrosion allowance specified (mm) 3.175Corrosion actual (mm) 3.175Limiting metal temperature exceeded? (-) NoDesign criterion (-) RuptureMaximum tube temperature (1) (C) 471.10Stress curves intersect (C)Fraction of time in rupture regime (-) 1

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API 530 Tube Thickness Design Page 2Released to the following HTRI Member Company: CV. Alpha Omega Mohammad Firmansyah

MKH Units CONVECTION COIL (BARE TUBE)VERTICAL CYLINDRICAL FIRED HEATER

Elastic Design ResultsDesign pressure (kgf/cm2G) 10.544Design metal temperature (2) (C) 484.99Allowable stress (kg/mm2) 10.03Minimum stress thickness (mm) 0.315Minimum thickness w/ corrosion allowance (mm) 3.490

Equivalent Temperature CalculationRupture exponent at Start of Run (-)Temperature factor (FT) (-)V (per API 530 Figure 2) (-)N (per API 530 Figure 2) (-)Equivalent temperature (C)

Rupture Design Results (3), (4)Design pressure (average) (kgf/cm2G) 10.544Design temperature (C) 484.99Time in creep range (hr) 100000.Larson-Miller parameter (Kelvin-Hr) 19.0Rupture stress (kg/mm2) 9.04Minimum thickness w/o corrosion allowance (mm) 0.350Corrosion fraction (B) (-) 9.08009N (per API 530 Figure 1) (-) 6.59255F (per API 530 Figure 1) (-) 0.94442Minimum rupture thickness (mm) 3.348Notes:(1) For elastic design (fraction of time in rupture regime = 0), the maximum tube temperature equals

input for temperature at maximum operating pressure. For rupture design (fraction of time inrupture regime > 0), the maximum allowable continuous temperature at average pressure is basedon actual thickness selected to give design life, but limited to Maximum Design Metal Temperaturefor selected tube material.

(2) Maximum elastic design temperature is limited to stress curve intersection temperature. If tube isoperated above this temperature, then rupture design controls and the average pressure shall notexceed pressure shown in the rupture design.

(3) The rupture analysis for a linear changing temperature profile is based on a lower limit of the startof run temperature and an upper limit of the end of run temperature. A tube operating continuouslyat the equivalent temperature will suffer the same creep damage as the one operating at the abovelinear profile. Operation at a constant metal temperature above the equivalent temperature mayresult in a life shorter than the design life.

(4) The rupture design is performed at a constant temperature equal to the equivalent temperature andthe specified design life.

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Input Reprint Page 3Released to the following HTRI Member Company: CV. Alpha Omega Mohammad Firmansyah

MKH UnitsCONVECTION COIL (BARE TUBE)VERTICAL CYLINDRICAL FIRED HEATER

Case ConfigurationCase type API530

Case DescriptionCase name VERTICAL CYLINDRICAL FIRED HEATERProblem name CONVECTION COIL (BARE TUBE)Reference Number AO-DFH-PID-005-0001Revision 0Service CRUDE OIL HEATERCustomer PUSDIKLAT MIGASPlant CEPU - JATENG

API 530Tube design YesTube life evaluation NoTube type TubingNominal outside diameter N2Outside diameter 60.325 mmWall Schedule S80Wall thickness 5.537 mmTube material 5CRRupture stress curve MinimumPrint metal properties No

Operating ConditionsMaximum pressure for elastic design 10.544 kgf/cm2GMaximum operating pressure at start of run 10.544 kgf/cm2GMetal temperature at start of run 471.10 CMetal temperature at end of run 471.10 CMaximum peak local heat flux 82000.0 kcal/hr m2Design life for stress 100000. hrRun length between start and end of run 1. yrCorrosion allowance 3.175 mm

Metal Temperature Parameters (SOR)Fluid bulk temperature 343.00 CInside heat transfer coefficient 3000.00 kcal/m2-hr-C

Heat Flux Parameters (SOR)Tube flux type Single row against refractoryCenter to center spacing 152.000 mm