spare PD0251-IntEcoTHERMAX LTD.IBR CALCULATIONSPUNE 411 019INTEGRAL ECONOMISERDESIGN CODE :-IBR 1950 & IT'S LATEST AMENDMENTS.MODEL :-BDF-80/1-SDRAWING N0. :-ECONOMISER COILS MODULE I & IIPL4-2PD-069524PREPARED BYCHECKED BYAPPROVED BYDATEBVKBVKBVK1/12/13THERMAX LTD.IBR CALCULATIONSPUNE 411 019DESIGN PRESSURE :-44.50CALCULATION PRESSURE :-48.00KGF/CM^2 (G)DESIGN TEMPERATURE :-191deg. CDESIGN TEMPERATURE :-300deg. C(FOR PERMISSIBLE STRENGTH CALCULATION)MATERIAL SPECIFICATION :TUBE MATERIAL :-SA 210 Gr. "A1"MIN. TENSILE STRENGTH @ ROOM TEMPERATURE (R20) =4218.52KGF/CM^2YIELD STRENGTH CALCULATION :YIELD STRENGTH @300DEG.C (572)DEG. F =1946.14KGF/CM^2[1996.77 - (((1996.77-1926.46)/50) X (612-600))]WHERE ,YIELD STRENGTH @500DEG. F (260)DEG. C =1996.77KGF/CM^2YIELD STRENGTH @600DEG. F (316)DEG. C =1926.46KGF/CM^2[ AS PER ASME SECT.II, PART `D' TABLE Y-1 ]PERMISSIBLE STRENGTH (R20/2.7) OR (Et/1.5) WHICHEVER IS LESS : (f1) :1297.43KGF/CM^2MAXIMUM ALLOWABLE STRESS CALCULATION :MAX. ALLOW. STRESS300DEG.C (572)DEG. F =1202.28KGF/CM^2[1202.28-(((1202.28-1202.28)/50) X (612-600))]WHERE ,MAX. ALLOW. STRESS500DEG. F (260)DEG. C =1202.28KGF/CM^2MAX. ALLOW. STRESS600DEG. F (316)DEG. C =1202.28KGF/CM^2[ AS PER ASME SECT.II, PART `D' TABLE 1A ]MAXIMUM ALLOWABLE STRESS @ TEMP'RE300DEG.C:(f2):1202.28KGF/CM^2PERMISSIBLE STRSS TO BE USED FOR COMPUTATION,LOWER OF `f1' & `f2' =1202.28KGF/CM^2PREPARED BYCHECKED BYAPPROVED BYDATEBVKBVKBVK1/12/13THERMAX LTD.IBR CALCULATIONSPUNE 411 019MIN. REQUIRED THICKNESS OF TUBE, t min = (PxD)/(2xfxE+P)+C , FROM IBR 338WHERE,CALCULATION PRESSURE :: P :48.00KGF/CM^2 (G)EXTERNAL DIAMETER: D :INMMPROVIDED THICKNESS OF TUBES: T :INMMAVAILABLE THICKNESS (NO NEGATIVE TOLERANCE): t :INMMPERMISSIBLE STRESS FOR STUB MATERIAL: f :INKG/CM^2MINIMUM LIGAMENT EFFICIENCY :: E :1.00COROSSION ALLOWANCE :: C :0.75THEREFORE,O.D.THICKNESSTHICKNESSTHICKNESSfMATERIALTOLERENCECHOSENAVAILABLEREQD. (t min)ON THK.38.13.663.661.501202.28SA 210, GRADE "A1"NILHENCE THICKNESS AVAILABLE IS GREATER THAN REQUIRED THICKNESS. SO, DESIGN IS SAFEAS PER IBR CLAUSE 338 (C) (II) (a), PERMISSIBLE REDUCTION IN THK. OF TUBE AT ANY LOCATIONAROUND THE BEND EXTRADOS, IN PERCENT; BELOW THE CALCULATED MINIMUM PERMISSIBLEDESIGN THICKNESS OF STRAIGHT TUBE, SHALL NOT EXCEED THE VALUE CALCULATED BY THEFOLLOWING FORMULA,PERMISSIBLE REDUCTION IN THK. DUE TO BENDING OF TUBES :- Ty = 100 / (4R/D + 2)BENDING RADIUS :-: R :INMMOUTSIDE DIAMETER OF TUBE :-: D :INMMPERMISSIBLE MINIMUM THK. OF TUBE AROUND BEND EXTRADOS = tmin x [(100-Ty)/100].WHERE,"tmin" IS THE CALCULATED MINIMUM PERMISSIBLE DESIGN THK. OF STRAIGHT TUBETUBE ODBENDCAL. MIN.PER. REDN. INPERMISSIBLE MINIMUM THK.RADIUSTHK. OF TUBETUBE THK. IN %AROUND BEND EXTRADOS`D'`R'`tmin'"Ty" in "%"AS PER IBR 338 (C) (II) (a)38.1501.5013.791.29HOWEVER, AS PER IBR CLAUSE 338 (C) (II) , MAXIMUM PERMISSIBLE AMOUNT OF THINNING ATANY LOCATION AROUND THE BEND EXTRADOS ON COLD FORMED BENDS WITHOUT ANY HEATTREATMENT, IS 25% OF THE ACTUAL THICKNESS OF STRAIGHT TUBE.TUBE ODACTUALMINIMUM PERMISSIBLE THK. AROUND BEND EXTRADOS AS PER"mm"TUBE THK.IBR CLAUSE 338 (C) (II) WITHOUT HEAT TREATMENT IN "mm"38.13.662.75THEREFORE, MINIMUM PERMISSIBLE THICKNESS AFTER BENDING WITHOUT ANY SUBSEQUENTHEAT TREATMENT IS THE HIGHER OF THE TWO VALUES CALCULATED ABOVE AS PER IBRCLAUSES 338 (C) (II) (a) & 338 (C) (II) .TUBE ODACTUALMINIMUM PERMISSIBLE THK. AROUND BEND EXTRADOS"mm"TUBE THK.WITHOUT HEAT TREATMENT IN "mm"38.13.662.75PREPARED BYCHECKED BYAPPROVED BYDATEBVKBVKBVK1/12/13

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