Pipe is Under Clamping Force
8
document.xls 1 of 8 Line Number H90625 Specification EBT Pipe Stress due to clamping forces and check combined circumferantial stress: 2. Pressure Vessel Design Manual, 3rd Edition, Dennis Moss 3. ASME B31.3-2006 Required clamping force calculated W' 2700 N Safety factor against the calculated force for clamping SF 1.5 Clamping Force on the pipe cross section W = SF * W' = 4050 N Internal maximum operating pressure of the pipe P 11.3 MPa Pipe Size DN 100 with additive reinforcement around Pipe Schedule Sch120 add 12.7 mm around ( DN125 Sch 120 ) Pipe Material A 106B Maximum operating temperature of the pipe 123 B31.3 Basic Allowable tensile stress of the pipe material at the 137.89 MPa Yield strength of pipe material at maximum operating temperature 217 MPa B31.3 Quality factor from Table A-1A or A-1B 1 B31.3 Coefficient from Table 304.1.1, valid for t <= D / 6 Y 0.4 B31.3 Weld joint reduction factor per para. 302.3.5(e) W 1 Pipe OD 114.3 mm Pipe OD with reinforcement 139.7 mm Pipe thickness WT 11.13 mm Reinforcement thiskness thickness 12.7 mm Manufacture negative tolerance in wall thickness Tol 12.5 % Sum of mechanical allowances including corrosion C 4.5 mm Pipe remaining thickness: t = ( 1 - Tol / 100) * WT - C = 5.24 mm Assumed Pipe only carries the pressure stresse Reinforcement remaining thickness 11.11 mm Assumed the reinforcement carries the crashing 23.28 mm Pipe calculation internal diameter 103.82 mm Radius of centroid of cross section of reinforcement 64.29 mm Short clamp beam height H 125 mm for 125 PFC Considered effective length in the calculation B = H + 1.56 SQRT( R T ) = 166.7 mm Considered cross section area in the effective length A = B * T = 1852 Moment of resistance of the considered cross section 3431 Area moment of inertia of the considered cross section 19063 Shape factor for the considered cross section F 1.20 Poisson ratio of the material n 0.3 Distance between centroidal axis and neutral axis of cross sectio e 0 mm Material elasticity modulus E 195970 MPa Ref: 1. Roark's Formulas for Stress and Strain, 7th Edition, Table 9.2 Case 1 o C SA SY Eq Do D2 T2 T = ( 1 - Tol / 100) * T2 = D2 / 6 = Di = Do - 2 t = R = ( D2 - T ) / 2 = mm 2 Z = B * T 2 / 6 = mm 3 I = B T 3 / 12 = mm 4
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Transcript of Pipe is Under Clamping Force
Clamping force_ext reinfLine NumberH90625SpecificationEBTPipe Stress due to clamping forces and check combined circumferantial stress:Ref: 1. Roark's Formulas for Stress and Strain, 7th Edition, Table 9.2 Case 12. Pressure Vessel Design Manual, 3rd Edition, Dennis Moss3. ASME B31.3-2006Required clamping force calculatedW'2700NSafety factor against the calculated force for clampingSF1.5Clamping Force on the pipe cross sectionW = SF * W' =4050NInternal maximum operating pressure of the pipeP11.3MPaPipe SizeDN100with additive reinforcement aroundPipe ScheduleSch120add 12.7 mm around ( DN125 Sch 120 )Pipe MaterialA 106BMaximum operating temperature of the pipe123oCB31.3 Basic Allowable tensile stress of the pipe material at the oper.temp.SA137.89MPaYield strength of pipe material at maximum operating temperatureSY217MPaB31.3 Quality factor from Table A-1A or A-1BEq1B31.3 Coefficient from Table 304.1.1, valid for t
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