Write-upUSE OF THIS SPREADSHEET - ALL. INTERNAL PRESSURE OF PIPING & PIPELINESAllowable Internal Pressure Calculation EquationDATAFont ColorASME B31.3 2008ASME B31.4 2012ASME B31.8 2010Standard Values - Commercial pipe data from tablesStandard ValuesBlueIn-Plant PipingLiquid PipelinesGas PipelinesUser Input Values - Taken & inserted by the User from the tables of Codes, GPSA book or specified by selfUser Input ValuesBlackPi =2*t*S,pipe*E*W/(Do-2*t*Y)Pi =2*t*S,pipeline*E(0.72)/DoPi =2*t*S,pipeline*E*F*T)/DoCalculated ValueCalculated ValueGreent,S,E,Do,Y,Wt,S,E,Do,Et,S,E,Do,E,F,TNotes / Instructions for the user:6 values5 values7 values1This Spreadsheet enables quick reference and calulations for maximum allowable pressure for a user identified service for in plant process piping, liquid and gas pipelines. This is also useful for operations persons doing modifications on the pipelines and piping as well as for preliminery design checks. This is not meant to replace a systematic design performed with full referencing to the precise applicable clauses/sub-clauses of the relavant codes and standards.The Weld Joint Strength Reduction Factor 'W' below 800 F is 1.00. The values are in worksheet named " Table 5 W".Liquid Pipelines are designed for temperatures below 250 F.2The spreadsheet enables to find the allowable internal pressure in process plant piping as per ASME B31.3. Also on the same spreadsheet a provision has been made to check its pressure compatibility of the pipeline portion with either ASME B31.4 (Liquid Hydrocarbon pipelines) or ASME B31.8 (Gas pipelines).For example, assume that a pump discharge piping located inside the plant -A is routed to another plant - B, several miles away. So the integrity of the entire system is divided into piping in the plant - A (built as per B31.3), the pipeline between the two plants (built as per B31.4 for liquids or B31.8 for gas pipelines as the case may be) and the piping in the plant - B (built as per B31.3), can be checked simultaneously using this spreadsheet.t = t,nominal - Mill Tollerance Allowance - Corrosion Allowancet = t,nominal - Corrosion Allowancet = t,nominal - Corrosion Allowance33. Please note that the calculations in table are done using some values. A user can use each row for the sizes and input data of his requirement by inserting the values in black cells. Blue font cells contain standard commercial pipe data already incorporated in the spreadsheet. Calculated results are in Green font cells. User should know nominal pipe size, schedule no., material, material grade, method of pipe production (ERW, Seamleass etc.), design temperature, location for gas lines, and corrosion allowance to be given.For 31.4 and 31.8 code pipelines, do not consider mill tolerances. The nominal thk is used in the calculation. Pls. see below.403.2.2 Wall Thickness and Defect Tolerances. Wall thickness tolerances and defect tolerances for pipe shall be as specified in applicable pipe specifications or dimensional standards included in this Code by reference in Mandatory Appendix I. Design factors in this Code were established with due consideration for underthickness tolerance and maximum allowable depth of imperfections allowed by the referenced standards; no additional allowance is necessary However, for 31.3 piping, mill tolerances are to be subtracted.4Type A construction also applicable to "Liquid Petroleum Transportation Piping Code." ANSI B31.4-1979. Users may refer to the latest versions of the ASME Standards and GPSA book for correctness. Some of the tables are from older versions.5Please note that the Table nos. mentioned the worksheets Table 1,2,3 & 4, FIG. 17-23, 24, 25, 26, 27 & 28 (The letters T, F, Y, E are added on each sheet name along with Table or Fig no. so that you can quickly select the appropriate reference worksheet) refer to the table nos. in GPSA book / Applicable Standard from where they are produced.6Pipelines sizes can be 2" and 3" also. But the spreadsheet is developed from 4" onwards.7For any interpretation clarifications of Stress Values, notes and material related factors or data, always refer to the Engineers who are well versed with codes interpretation or assigned with material department.References for Spreadsheet Development:1. GPSA Engg. Handbook, 11h Ed, 19982. ASME B31.3 2008, ASME B31.4 2012& ASME B31.8 20103. Properties of Commercial Pipe, pipingdesigners.comGPSA - Gas Processors & Suppliers AssociationASME - American Society of Mechanical Engineers

All Pr CalculationColor code of Values in the TableReference Data TablesUSER INPUTPipe thickness, tCalculated Pipe thickness Value for pressure design after applying factors, t calculation of pipes is different from pipelinesStandard ValuesFlange ratings : Refer Fig 17.28Fig 17.28 to check Pressure & Temp compatibilityUSER INPUTUSER INPUTReferences for Table Development:User Input ValuesAll. Stress, S,pipeWorkSheet Fig 17.25Corrosion AllowanceWeld Joint Strength Reduction Factor W1. GPSA Engg. Handbook, 11h Ed, 1998 Work Sheet 2Calculated ValueSp.Min.Yield Strength, S,pipelineWorkSheet Fig 17.25mminchesWorksheet Table 5 Note: For temp