Hemispherical Head Design Tool q6c73

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Pressure Vessel Engineering Ltd.

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Hemispherical Head Design Tool ver E4.01

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Hemispherical Head Description

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Dimensions: 231.102 19.488 19.291 0.157

Do [in] - outside diameter of head tb [in] - thickness before forming tf [in] - thickness after forming Corr [in] - corrosion allowance

Material and Conditions: Carbon Steel Material 19,585 S [psi] - allowable stress 1.00 E - head longitudinal efficiency 3,584.6 P [psi] - interior pressure Calculated Properties:

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Approx. head weight based on steel, lbs =

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Approx. head volume, cuft =

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388765.3 1081.07

Variables: nt [in] = tf-Corr ~~ thickness with corrosion allowance removed 19.291-0.157 = 19.134 L [in] = (Do-2*nt)/2 ~~ inside radius with corrosion allowance removed (231.102-2*19.134)/2 = 96.418 Ro [in]= Do/2 231.102/2 = 115.551 Required Thickness: UG-32(f) Treq [in] = (P*L)/(2*S*E-0.2*P)+Corr ~~required minimum thickness (3584.6*96.418)/(2*19585*1-0.2*3584.6)+0.157 = 9.145 CheckTreq = Treq<=tf 9.145<=19.291 = Acceptable Maximum Pressure: UG-32(f) Pmax [psi] = (2*S*E*nt)/(L+0.2*nt) ~~ maximum allowed design pressure (2*19585*1*19.134)/(96.418+0.2*19.134) = 7476.5 CheckPMax = Pmax >= P 7476.5 >= 3584.6 = Acceptable App. 1-4(f) calculation is not included on this sheet Heads may be subject to stress relief if large elongation occurs - UCS-79(d), UNF-79(d), UHA-44(d) Use the Weld Efficiency program to calculate E The UG-16(b) minimum thickness requirement has not been taken into consideration here. This sheet cannot be used to check for allowable exterior pressure loads. This sheet is for educational use only - use at your own risk.

Pressure Vessel Engineering Ltd. 120 Randall Drive, Suite B Waterloo, Ontario, Canada, N2V 1C6 www.pveng.com (519) 880-9808