Tall Tower

Design of tall TowerInput Req.DDiameter of the vessel3ft18Input Req.D1Width of the vessel along with the insulation ,allowance for the piping associated3.5ft21Input Req.EEfficeincy of the weld seam.0.85Input Req.hTDistance from the base to the vessel bottom head to the shell joint4ftInput Req.HHeight of the vessel100ftInput Req.PInternal Pressure150psiFrom TablePwWind Pressure30psiRInside Radius of the vessel1.5ft18inFrom TableSAllowable stress value 13500psiMaterial A 285 Gr C at 200 CHead 2:1 Seam less eliptical headtMininmum required thickness of the vessel for internal pressure for the longitudnal seam0.237inchestMininmum required thickness of the vessel for internal pressure for the cicumferrential seam0.117inchestMininmum required thickness of the headof the vessel which is seamless and ellepsoidal0.236inchesWind LoadPw*D1*HV1*h1MVessel105001050050525000ft lbPlatform2402409623040ft lbLadder2940294049144060ft lbTotal13680lb692100ft lbMTMomemt at the bottom head seam638220ft lbtThickness at the bottom seam0.655inchesThickness for internal pressure0.117inchesTotal thickness0.773inches

Selected from the table0.75inchesAs the height increases the thickness of the plate should decrese for economical reasons . As the bending decreases while going up thethickness should decrease as the height decreasetw/tpRatio2.764tw/tpRatio1.288From Tablemm from Table0.42From Tablemm from Table0.6XDistance from the top of uniform thickness42ftXDistance from the top of uniform thickness36ft8 ft plate is used Plate of thickness 0.25 up to distance of40ftPlate of thickness 0.50 up to distance of32ftPlate of thickness 0.75 up to distance of24ftTotal96ftWeight of the towerShell40*973880skirt4*19578032*1956240Base Ring72024*2947056Anchor Rings260HeadTop 0.3105 nom160Anchor Lugs120Bott. Of 0.8125 nom393Total1880Int . Plate work8006%112.8Tray support1101992.8Insulation Ring220Approximately2000openings900Total197596%1185.54Equipments20944.54Insulation4600Approximately21000Platform1160Ladder2800Piping 1400Total9960Approximately10000

Total Erection weight33000Operating ConditionTrays600Operating fluid2400Total3000.+ Erection weight36000

Test Water42000.+ Erection weight36000Total test weight78000

Stresses in the shell at bottom head joint to the shell joint SStress due to internal pressure1837.5psiNomial diameter of the vessel36SStress due to Wind9623.0126336249SStress due to Weight in erection condition47.138047138763.7142857143SStress due to Weight in operation condition359.4202898551394.2028985507 Combination of the stressesIn empty condition Wind ward side+9640Lee ward side--9640Stress due to wind--358Stress due to wind--358Stress due to weight+9282Stress due to weight--9998

In operating conditionStress due to internal pressure+1837Stress due to internal pressure+1837Stress due to wind+9640Stress due to wind--9640Stress due to weight--392Stress due to weight--392+11085--8195Allowable stress for the material at0.85 efficiency of the joint11475CheckDoes satisfy the checkStress in the shell at the distance of 72 feet from the top where the stress are the maximum in the 0.5 inch thickness of the shellStress due to windShell7560272160ft-lbPlatform24016320ft-lbLadder210073500ft-lb361980ft-lbTotal bending momemt361980ft-lbStress due to bending moment8299.3759702486psiStress due to internal pressure2756.25psiTotal Stress 11055.6259702486psiCheckDoes satisfy the checkStress in the shell at the distance of 72 feet from the top where the stress are the maximum in the 0.5 inch thickness of the shellStress due to windShell420084000ft-lbPlatform2408640ft-lbLadder114021660ft-lb114300ft-lbTotal bending momemt114300ft-lbStress due to bending moment5313.8194789752psiStress due to internal pressure5512.5psiTotal Stress 10826.3194789752psiCheckDoes satisfy the check

Factor Xat the considered height

Sheet3