Sample Calculation1.0 Calculation for Piping DiameterSL. No.DescriptionValueUnitRemarks1.1Volume flow rate, (Q)4.16m3/hr1.2Max. Considered Velocity of Flow, (V)3m/s1.3Flow Area, (A)0.0003851852m2A=Q/V1.4Pipe Diameter, (D)0.0221478113mPipe Diameter, (D)22.1478113194mm1.5Selected pipe Diameter, (D)25mm1.6Outside Diameter of Pipe, (D0)33.4mm1.7Pipe thickness, (t)4.55mm1.8Internal Diameter of Pipe, (d)24.3mm2.0 Calculation for Minimum Wall Thickness as per ASME B31.1As per ASME B31.1 formula for Minimum wall thickness calculation for straight pipe is given by

Where,tm= Minimum thicknessP=Internal Design Pressure, psi(g)D0= Outside Diameter of pipe, mmS=Maximum Allowable Stress in material Due to internal pressure and joint efficiency, psi. The Value is given in Appendix-1,Teble A-1 of ASME B31.1, 2007E=Weld Joint Efficiency value given in Appendix-1,Teble A-1 of ASME B31.1, 2007y=Coefficient of valve given in Table 104.1.2(A) of ASME B31.1, 2007A=Additional thickness for corrosion allowance, mm2.1Internal Design Pressure, (P)80psi(g)2.2Outside Diameter, (D0)33.4mm2.3Maximum Allowable Stress, (S)17100psi2.4Weld Joint Efficiency, E12.5Coefficient, (y)0.42.6Corrosion Allowance, (A)1.5mm2.7Minimum Thickness, (tm)1.58mm2.8Mill Tolerance, 12.5%0.202.9Total thickness1.782.10Standard thickness 4.55mm Taken from ASME B36.103.0 Calculation for Actual Velocity of Pipe flow3.1Actual Flow Area, (A)0.0005m23.2Actual Velocity of Flow, (V)2.49m/s4.0 Calculation for Pressure DropAs per Darcy-Weisbach formula pressure drop is given in

Where, f=Friction Factor, Calculated using Colebrook-White equation or using Moody ChartL = Length of Pipe WorkD=Inner diameter of pipe work g=Acceleration due to gravityv=Velocity of fluid4.1Density of Fluid Flow, ()1000kg/m34.2Dynamic Viscocity of fluid flow, ()0.00072(kg/m.s)4.3Inner Diameter of Pipe Work, (D)24.3mm4.4Velocity of flow, (V)2.49m/s4.5Reynolds Number, (Re)84109.3186283071Re=vd/4.6Friction Factor, (f)0.027from Moody chart4.7Equivalent Length of pipe200m4.8Frictional pressure Drop, (hf)70.34m

Pipe Sizing & Pressure Drop calDETAILED PIPE SIZING CALCULATIONSL. No.DescriptionVolume Flow, (m3/s)Max. Velocity, (m/s)Flow Area, (m2)Calculated Pipe Dia. (mm)Selected Pipe Dia., (NB)Outside Dia. Of Pipe, (mm)Internal Design Pressure, (psig)Max. Allowable Stress, (psi)Weld Joint Efficiency, ECoefficient, yCorrosion Allowance, AMin. pipe thickness, (mm)Mill Tolerance 12.5%Total Calculated thickness, mmSelected Pipe Thickness, (mm)Inside Dia. Of Pipe, (mm)Actual Velocity of flow, (m/s)1Service Water Main Distribution Line0.001155555630.000422.1484048.3801710010.41.51.610.2021.815.0838.141.012Consumption points lines0.000330.000111.8952026.7801710010.41.51.560.1951.763.9118.881.19

DETAILED PRESSURE DROP CALCULATIONSL. No.DescriptionDensity of Flow, (Kg/m3)Mean velocity of flowInternal Diameter, (m)Viscocity of Fluid, (kg/m.s)Reynolds Number, (Re)Internal Roughness, (mm)Friction FactorEquivalent Length, (m)Acceleration Due to gravity, m/s2Pressure drop in line, (m)Pressure drop , barFor Re20001Service Water Main Distribution Line10001.010.038140.0007253588.26540817680.0460.025292.829.8110.0110.98212263172Consumption points lines10001.190.018880.0007231227.43505542890.0460.0285.969.810.6390.063

DETAILED EQUIVALENT LENGTH CALCULATIONSL. No.DescriptionInternal Diameter, (m)Straight Length of Pipe, (m)Nos. of 900 ElebowEquivalent Length (L/D=14) of 900 ElebowNos. of 450 ElebowEquivalent Length (L/D=14) of 450 ElebowNos. of valvesEquivalent Lenghth of ValvesNos. of TeeEquivalent length of TeeNos. of ReducerEquivalent Length of Reducer (L/D=15)Total Equivalent LengthGateCheckOtherGate (L/D=8)Check (L/D=50)OtherFlow through runFlow through branchFlow through run (L/D=20)Flow through branch (L/D=60)1Service Water Main Distribution Line0.0381428052.67002100.6101.9101007.63021.1442292.822Consumption points lines0.01888520.53001000.1500000010.28325.96