Indexcjc, Rev. 31.01.2014Index of Pipe wall Thickness Calculation1ASME B31.3 # 303.8Recommendations for minimum thicknessesPressure design of componentes9ASME B36.10M Schedule / Identification2ASME B31.3. Chapter 1ASME B36.19M & ASME B36.10M Schedule /Part 3. Fluid serviceIdentification3Table A-1 ASME B31.3-200210Corrosion Allowance for ASME B31.3 Piping"Basic allowable stresses in tensions for metalsCarbon steel pipes and tubes11Appendix M. Guide to classifying fluid services4Table A-1B. ASME B31.3-200212ASTM A106, API 5L and ASTM A 53 SeamlessBasic casting quality factors Eccarbon steel pipes. Pressure and TemperatureTable A-1B. ASME B31.3-2002Ratings. Table of Maximum Allowable PressureBasic quality factors for longitudinal weld joints(kPa), for different pipe sizes and temperaturesin pipes, tubes, and fittings Ej13ANSI B16.5 - Maximum Press. and Temp. Ratings5Table 304.1.1 .ASME 304.1.1-304.2.1Non-shock pressure (psig) and temperature ratingsY coefficientfor steel pipe flanges and flanged fittingsFor t < d/614Sample wall thickness calculation6ASME B1.20.1 83Table 2. Basic dimensions of American National15Pressure ratings and maximum allowable pressuresStandard Taper Pipe ThreadReferences7ASTM A 106, ASTM A 53 and API 5LTable 9.- Tolerances for Wall ThicknessMill toleranceNext revision will include stainless steel materials

Wall thickness calculationPag. 1 of 2Nota 1La unidades que se indican u otras vlidasPag. 2 of 2Pipe wall thickness calculation according ASME B31.32.-Pipe exterior diameter6.-Pressure design thickness value (tdis)(Note 6)9.- Required thicknesso (treq)dn =2inNota 2Funcin para el dimetro exterior de caeras de acero al carbonotdis =P * dext / ( 2* (sallow * E + P* Y) )Ec. 3aASME B31.3, #304.1.1, Ec. (2)Datade =60.3mm(Note 2)Pipe_Imp_CS_Dext_dnP =2.00MPatreq =tdis + OT(Sheet 1)Pipe (CS) material (Note 1)1d =60.3mmtdis =0.03mmWeld joint type (Note1)23.-Material allowable stress(Note 3)Nota 3Interpolacin el esfuerzo admisible a la temperatura "t", en Tabla A-1Hoja 3sallow =2,199MPaOT =3.50mmNominal diameterdn =2in 3ASME B31.1,Table A-1t =80C(Para t < 38 C, la tabla utiliza 38 C)E =1-treq =3.53mmDesign pressureP =2Mpa 4sallow =2,199MPa(Sheet 3)Row =16(Selected material)Y =0.4-Design temperaturetemp =80C 5tdis =0.03mm10.-Mill tolerance (MT)Corrosion allowanceTC =1.59mm 64.- Quality factor "E" for the given longitudinal weld typeDe Hoja 2Table 9.- Mill tolerance for the given pipeThread (Yes/No)Hilo =Yes7(Note 4)Col_A =3tA =37.8CsA =103.4MPa7. Thread(Note 7)Allowance in percentage of specified thicknessMaterial:API5L Gr. A25and a longitudinal weldCol_B =4tB =93.3CsB =2861.3MPaThread =YesMT =12.5%(Sheet 6)1.-Pressure design thicknesstype:SForPipe minimum nominal thickness (tmin)The pressure design thickness "t" is calculated according equationASME B31.3, Tabla A-1B givesS =sB + (sA - sB) * (tb - t)/(tb - ta)dn =2intmin =treq * (100 /(100 - TF)(3a of ASME B31.3 paragraph 304.1.2E =1(Sheet 4)S =2199MPaTable 2, ASME B1.20.1-1983, gives following number oftreq =3.53mmthreads per inchMT =12.5%(Sheet 1)5.- "Y" coefficient for equation (3a)Nota 4Factor "E" de Hoja 4.- Table A-1BHoja 4NT =11.5threads/inch(Sheet 6)tmin =4.03mmTabla 304.1.1 should be used for t < d/6For a number of threads per inch NT, Table 1,d =60.3mmMaterialAPI5LASME B1.20.1-198 gives a thread depth(TD)11.- Selected shedule (SCH) and resulting thickness (s)tdis: design thickness by pressure[mm]d/6 =10.05mmCorrect. s < d/6Welding typeSTD =1.91mm(Sheet 6)SCH =80(Note 8)9P: design internal pressure[Mpa gauge]ASME 304.1.1-304.2.1, Table 304.1.1. gives for:(Note 4)E-factor1dn =2inde: pipe exterior diameter[mm]material type:88.- Over Thickness "OT"s =Pipe_Imp_CS_Thickness_dn_schs: material allowable stress[MPa]and Temperature:80CNota 5Interpolacin coeficiente "Y", de Tabla 303.1.1Hoja5OT =TC + TDs =5.54mmE: Quality factor[-]following "Y coefficient"TC =1.59mmY: coefficient from Table 304.1.1[-]Y =0.4(Sheet 5)t =482C(Para t < 482 C, la tabla utiliza 482 C)TD =1.91mmSchedule80gives a thickness greater than(Para t > 621 C, la tabla utiliza 621 C)OT =3.50mmthe calculated requiered minimumcjc, Rev. 31.01.2014In columns "!P" to "W", it is posible to see the calculationThe nine (9) cells in gelb are required inputsCol_A =1tA =482CYA =0.4steps.The last input (#9) correspomds to the schedule that shall beCol_B =2tB =510CYB =0.5#1.-Welding type#4.-Quality facto "E" is determined fron Table A-1BTo see these columns, if they are hiddeen, click on theselected to obtain a thickness larger than the in point #10SSeamless pipefor the selected material and weld joint type.plus sign "+" in the upper teil of the sheet.calculated minimum required.312345ERWElecric Resisitance Welded pipe482510566593621EFWElectric FusionWelded pipe#5.-"Y" coeficient of Eq. 3a is determined by interpolationTo see hidden sheets,For result checking,see example in sheet "14. Example"12345FBWFurnace Butt Welded pipefrom Table 303.1.1, for the selected material and- Right click on any sheet-labelAlso, see Recommended minimum thicknes in sheet 71Austenitic_steel0.40.40.40.50.7temperature- click on Unhide2Cast_iron0N/AN/AN/AN/A#2.-Pipe exterior diameter is obtained with the function3Ferritic_steel0.40.50.70.70.7de =Pipe_Imp_CS_Dext_dn#6.-Use any consistent set uf unitsValidation list for thread selection4Other_ductile_metals0.40.40.40.40.4Yes1234567#3.-Allowable stress for selected material and temperature#7.-When thread is to be considered, the number ofNois calculated by interpolation in Table A-1 of sheet 3threads per inch id obtained from Table 2 and theY =YA + (t - tA) / (tb - tA) * (YB - YA)thread heiht from Table 1 of sheet 6.En columnas P a W, se pueden ver los pasos del clculoY =0.4y las notas.#8.-Select a shedule, that with the used nominalPara ver estas columnas, si estn ocultas, hacer clickNota 6.La unidades que se indican u otras vlidasdiameter, will give a thickness larger than theen el signo "+", en la parte superior de la hoja.minimum calculated calue "tmin"Nota 7Si existe hilo, Tablas 2 y Tabla 3 entregan la profundidad del hiloTable 2.Table 1NPSThreads/inThreads/inH (mm)1/1627270.8148321/827181.2219941/418141.5712443/81811.51.9128741/21482.749553/414111.51 1/411.51 1/211.5211.52 1/28383 1/2848586888108128148168188208248dnSchin-1/253/4101201 1/2302403604805100612081401016012STD14XS16XXS18202224262830323436384042444648

1. #304.1.2ASME B31.3 - 2002 - 1ASME B31.3 # 303. Pressure design of componentesASME B31.3, #304.1.1, Eq. (2)Equation (3a) of ASME B31.3 paragraph 304.1.2t :pipe wll thickness (measure or minimum perpurchase specificationP:internal design pressure gauge[Pa]dext:Exterior pipe diameter [mm]s =Stress value for materialfrom Table A-1[Pa]E :quality factor from Table A-1A or A-1BY :coefficient from Table 304.1.1 , valid fort < dext / 6t dext / 6Ferritic steelAustenitic steelCast ironSheet 5Coefficient YASME 304.1.1-304.2.1Table 304.1.1.For t < d/6t