SWBM-WWBM cal.S.No.Main perticularsCalculation of Wave & still water bending moments1Length between perpendicularLBP =148m2Length overallLOA=158m3LENGTH (scantling)L =145.69m4BREADTH moldedB =22.6m5DRAFT (scantling)T =8.4m6DEPTHD=12.8m7Block co.Cb =0.678speedV=17knots9material factork1Mild steel10material factork0.78HTS11gravitational accelerationg9.81m/s212Cw10.75-[(300-L)/100]^3/28.833211389713Cv0.2 for L>100 m0.214common acceleration perameterao3Cw/L+Cv*V/(L)0.463566899415Rsfor unrestricated service116roll redius of gyrationKr0.39B8.814m17metacentric HeightGM0.07B1.582m18period of rollTr(2kr/(GM))14.0152162207sec19c(1.25-0.025Tr)d0.899619594520Roll anglej50c/(B+75)0.4608706939radians21pitch angleq0.25ao/Cb0.1729727237radians22kv0.7 b/w 0.3L to 0.6L0.723ks0.2L to 0.7L from AP3.524combined vertical accelerationavkv*g*ao/Cb4.75121477330.3L100 m0.2common acceleration perameterao3Cw/L+Cv*V/SQRT(L)0.4635668994Rsfor unrestricated service1roll redius of gyrationKr0.39B8.814mmetacentric HeightGM0.07B1.582mperiod of rollTr(2kr/(GM))14.0152162207secc(1.25-0.025Tr)d0.8996195945Roll anglej50c/(B+75)0.4608706939radianspitch angleq0.25ao/Cb0.1729727237radianskv0.7 b/w 0.3L to 0.6L0.7ks0.2L to 0.7L from AP3.5combined vertical accelerationavkv*g*ao/Cb4.7512147733for 0.3L100 m0.2Common acceleration perameterao3Cw/L+Cv*V/SQRT(L)0.4635668994Rsfor unrestricated service1Roll redius of gyrationKr0.39B8.814mMetacentric HeightGM0.07B1.582mPeriod of rollTr(2kr/sqrt(GM))14.0152162207secc(1.25-0.025Tr)d0.8996195945Roll anglej50c/(B+75)0.4608706939radiansPitch angleq0.25ao/Cb0.1729727237radianskv0.7 b/w 0.3L to 0.6L0.7ks0.2L to 0.7L from AP3.5Combined vertical accelerationavkv*g*ao/Cb4.7512147733for 0.3L100 m0.2common acceleration perameterao3Cw/L+Cv*V/SQRT(L)0.4635668994Rsfor unrestricated service1roll redius of gyrationKr0.39B8.814mmetacentric HeightGM0.07B1.582mperiod of rollTr(2kr/sqrt(GM))14.0152162207secc(1.25-0.025Tr)d0.8996195945Roll anglej50c/(B+75)0.4608706939radianspitch angleq0.25ao/Cb0.1729727237radianskv0.7 b/w 0.3L to 0.6L0.7ks0.2L to 0.7L from AP3.5combined vertical accelerationavkv*g*ao/Cb4.7512147733for 0.3L90 m0.024N/mm2External sea pressurepe=0.01ho+(ks-1.5ho/T)*Cw*Rs/10000.066931452N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0683965957N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0427912063N/mm2Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0587416628N/mm2Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0628967954N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.079062549N/mm2Pressure In Ballast conditionPe-Pi0.012131097N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.079062549N/mm2Design pressurepd =0.079062549N/mm2Sigmasby interpolation b/w NA & Bottom130N/mm2Nominal thickness of platetp=0.5*s*(p/s)10.4809985259mmCorrosion allowance for platetc=2mmtotal thickness of platet =12.4809985259mm14mmProvidedc0.04 upto 4.6m above WL (reduce by 0.01 for each 2.3m)0.04Minimum thicknesstnmin.(0.5+cL)k9.5628187038mmtc2mmtmin.(0.5+cL)k + tc11.5628187038mmCalculation for Side Shell (Plating No. 3)s at NA140/k140N/mm2s at Bottom/Deck120/k120N/mm2s at Load pointby interpolation b/w NA & Bottom130N/mm2Side shell plating thickness calculationl =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank3.076mhp=hs+760 mm6.936mLoad ptdis from base line to load pt.6.524mhoVert. Dis. Summer loadWL to load pt.1.876mPo=L>90 m0.024N/mm2External sea pressurepe=0.01ho+(ks-1.5ho/T)*Cw*Rs/10000.046717114N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0384200015N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0266223643N/mm2Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0425728208N/mm2Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0467279534N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.054929949N/mm2Pressure In Ballast conditionPe-Pi0.008212835N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.054929949N/mm2Design pressurepd =0.054929949N/mm2Sigmasby interpolation b/w NA & Bottom130N/mm2Nominal thickness of platetp=0.5*s*(p/s)8.7361855953mmCorrosion allowance for platetc=2mmtotal thickness of platet =10.7361855953mmc0.04 upto 4.6m above WL (reduce by 0.01 for each 2.3m)0.04Minimum thicknesstnmin.(0.5+cL)k9.5628187038mmtc2mmtmin.(0.5+cL)k + tc11.5628187038mm12mmProvidedCalculation for Side Shell (Plating No. 4)s at NA140/k140N/mm2s at Bottom/Deck120/k120N/mm2s at Load pointby interpolation b/w NA & Bottom130N/mm2Side shell plating thickness calculationl =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank1.076mhp=hs+760 mm4.936mLoad ptdis from base line to load pt.8.524mLoad pt. above summer load waterlinehoVert. Dis. Summer loadWL to load pt.0.124mPo=L>90 m0.024N/mm2External sea pressurepe=Rs*ks (Cw-0.8ho)/10000.0305690399N/mm2Load pt. above summer load waterlineInternal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0134395064N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0131483293N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0290987858N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0332539184N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.034819449N/mm2Pressure In Ballast conditionPe-Pi-0.0042504091N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.034819449N/mm2Design pressurepd =0.034819449N/mm2Sigmas120/k120N/mm2Nominal thickness of platetp=0.5*s*(p/s)7.2395113645mmCorrosion allowance for platetc=2mmtotal thickness of platet =9.2395113645mmc0.04 upto 4.6m above WL (reduce by 0.01 for each 2.3m)0.04Minimum thicknesstnmin.(0.5+cL)k9.5628187038mmtc2mmtmin.(0.5+cL)k + tc11.5628187038mm12mmProvidedFor plating no.5 void space work as tankDepth (16-13) from base lineD=12.8mCalculation for Side Shell (Plating no. 5)Buckling to be dones at NA140/k140N/mm2s at Bottom/Deck120/k120N/mm2s at Load pointby interpolation b/w NA & Bottom130N/mm2Side shell plating thickness calculationl =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank1.876mhp=hs+760 mm2.636mLoad ptdis from base line to load pt.10.924mLoad pt. above summer load waterlinehoVert. Dis. Summer loadWL to load pt.2.524mPo=L>90 m0.024N/mm2External sea pressurepe=Rs*ks (Cw-0.8ho)/10000.0238490399N/mm2Load pt. above summer load waterlineInternal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0234317044N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0185379433N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0344883998N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0177587781N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.042863649N/mm2Pressure In Ballast conditionPe-Pi0.0190146091N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.0238490399N/mm2Design pressurepd =0.0238490399N/mm2Sigmas120/k120N/mm2Nominal thickness of platetp=0.5*s*(p/s)5.9914750726mmCorrosion allowance for platetc=2mmtotal thickness of platet =7.9914750726mmc0.04 upto 4.6m above WL (reduce by 0.01 for each 2.3m)0.04Minimum thicknesstnmin.(0.5+cL)k9.5628187038mmtc2mmtmin.(0.5+cL)k + tc11.5628187038mm12mmProvidedCalculation for Side Shell Longitudnal Stiffners (L1a - L4)l =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank8.1mhp=hs+760 mm11.96mLoad ptdis from base line to load pt.1.5mLoad pt. Below summer load waterlinehoVert. Dis. Summer loadWL to load pt.6.9mPo=L>90 m0.024N/mm2External sea pressurepe=0.01ho+(ks-1.5ho/T)*Cw*Rs/10000.0890324615N/mm2Load pt. Below summer load waterlineInternal tank pressures cargop1 =1.025(g+0.5av)hs/10000.1011710053N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0604691402N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0764195967N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0805747293N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.105447525N/mm2Pressure In Ballast conditionPe-Pi0.0164150635N/mm2Maxi. Pr. (maxi of ex. & internal pr.)pmax =Pdesign0.105447525N/mm2dis. of stiffner From base line1500mmSigmas160/k max.160N/mm2Z calculation (Min. required by rule book)Nominal section modulusZns*p*l2*103/(12*s)478.02878cm3Corrosion allowancetc2mmHeight of webhw280mmBreadth of flangebf42mmCorrosion allowance in section modulasZc=tc*hw(bf+0.3*hw)/100070.56cm3Total Z= Zn+Zc548.58878cm3280*12mm Bulb FlatProvided576cm3Calculation for Side Shell Longitudnal Stiffners (L5-L9)l =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank4.15mhp=hs+760 mm8.01mLoad ptdis from base line to load pt.5.45mLoad pt. Below summer load waterlinehoVert. Dis. Summer loadWL to load pt.2.95mPo=L>90 m0.024N/mm2External sea pressurepe=0.01ho+(ks-1.5ho/T)*Cw*Rs/10000.0557630303N/mm2Load pt. Below summer load waterlineInternal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0518345274N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0338579211N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0498083776N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0539635102N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.0657292875N/mm2Pressure In Ballast conditionPe-Pi0.0099662572N/mm2Maxi. Pr. (maxi of ex. & internal pr.)pmax =Pdesign0.0557630303N/mm2dis. of stiffner From base line5450mmSigmas160/k160N/mm2Z calculation (Min. required by rule book)Nominal section modulusZns*p*l2*103/(12*s)252.7924039934cm3Corrosion allowancetc2mmHeight of webhw240mmBreadth of flangebf34mmCorrosion allowance in section modulasZc=tc*hw(bf+0.3*hw)/100050.88cm3Total Z= Zn+Zc303.6724039934cm3240*9.5mm Bulb FlatProvided350cm3Calculation for Side Shell Longitudnal Stiffners (L 10-12)l =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank2.25mhp=hs+760 mm3.01mLoad ptdis from base line to load pt.10.55mLoad pt. above summer load waterlinehoVert. Dis. Summer loadWL to load pt.2.15mPo=L>90 m0.024N/mm2External sea pressurepe=Rs*ks (Cw-0.8ho)/10000.0248962399N/mm2Load pt. above summer load waterlineInternal tank pressures cargop1 =1.025(g+0.5av)hs/10000.028103057N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0210575878N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0370080444N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0202784227N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.0466243125N/mm2Pressure In Ballast conditionPe-Pi0.0217280726N/mm2Maxi. Pr. (maxi of ex. & internal pr.)pmax =Pdesign0.0466243125N/mm2dis. of stiffner From base line10550mmSigmas160/k160N/mm2Z calculation (Min. required by rule book)Nominal section modulusZns*p*l2*103/(12*s)211.36355cm3Corrosion allowancetc2mmHeight of webhw200mmBreadth of flangebf28mmCorrosion allowance in section modulasZc=tc*hw(bf+0.3*hw)/100035.2cm3Total Z= Zn+Zc246.56355cm3200*12mm Bulb FlatProvided253cm3
Lon.TankBHD&StiffnerLength between perpendicularLbp =148mLOA158LENGTH (scantling)L =145.69mBREADTH moldedB =22.6mDRAFT (scantling)T =8.4mDEPTH of TankDt=9.6mBlock co.Cb =0.67speedV=17knotsmaterial factork0.78HTSk1Mild steelgravitational accelerationg9.81m/s2Cw10.75-[(300-L)/100]^3/28.8332113897Cv0.2 for L>100 m0.2common acceleration perameterao3Cw/L+Cv*V/SQRT(L)0.4635668994Rsfor unrestricated service1roll redius of gyrationKr0.39B8.814mmetacentric HeightGM0.07B1.582mperiod of rollTr(2kr/sqrt(GM))14.0152162207secc(1.25-0.025Tr)d0.8996195945Roll anglej50c/(B+75)0.4608706939radianspitch angleq0.25ao/Cb0.1729727237radianskv0.7 b/w 0.3L to 0.6L0.7ks0.2L to 0.7L from AP3.5combined vertical accelerationavkv*g*ao/Cb4.7512147733for 0.3L90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0683965957N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0427912063N/mm2Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0587416628N/mm2Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0628967954N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.079062549N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.079062549N/mm2Design pressurepd =0.079062549N/mm2Sigmasby interpolation b/w NA & Bottom140N/mm2Nominal thickness of platetp=0.5*s*(p/s)10.0997428939mmCorrosion allowance for platetc=2mmtotal thickness of platet =12.0997428939mm14mmProvidedc0.02Minimum thicknesstnmin.(5+cL)k6.9893495685mmtc2mmtmin.(5+cL)k + tc8.9893495685mmCalculation for Side Shell (Plating No. 3)s at NA160/k160N/mm2s at Bottom/Deck120/k120N/mm2s at Load pointby interpolation b/w NA & Bottom140N/mm2Side shell plating thickness calculationl =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank3.076mhp=hs+760 mm6.936mLoad ptdis from base line to load pt.6.524mhoVert. Dis. Summer loadWL to load pt.1.876mPo=L>90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0384200015N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0266223643N/mm2Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0425728208N/mm2Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0467279534N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.054929949N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.054929949N/mm2Design pressurepd =0.054929949N/mm2Sigmasby interpolation b/w NA & Bottom140N/mm2Nominal thickness of platetp=0.5*s*(p/s)8.4183990835mmCorrosion allowance for platetc=2mmtotal thickness of platet =10.4183990835mm12mmProvidedc0.02Minimum thicknesstnmin.(5+cL)k6.9893495685mmtc2mmtmin.(5+cL)k + tc8.9893495685mmCalculation for Side Shell (Plating No. 4)s at NA160/k160N/mm2s at Bottom/Deck120/k120N/mm2s at Load pointby interpolation b/w NA & Bottom140N/mm2Side shell plating thickness calculationl =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank1.076mhp=hs+760 mm4.936mLoad ptdis from base line to load pt.8.524mhoVert. Dis. Summer loadWL to load pt.0.124mPo=L>90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0134395064N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0131483293N/mm2Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0290987858N/mm2Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0332539184N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.034819449N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.034819449N/mm2Design pressurepd =0.034819449N/mm2Sigmas120/k120N/mm2Nominal thickness of platetp=0.5*s*(p/s)7.2395113645mmCorrosion allowance for platetc=2mmtotal thickness of platet =9.2395113645mm10mmProvidedc0.02Minimum thicknesstnmin.(5+cL)k6.9893495685mmtc2mmtmin.(5+cL)k + tc8.9893495685mmFor plating no.5 void space work as tankDepth (16-13) from base lineD=12.8mCalculation for Side Shell (Plating no. 5)s at NA160/k160N/mm2s at Bottom/Deck120/k120N/mm2s at Load pointby interpolation b/w NA & Bottom140N/mm2Side shell plating thickness calculationl =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank1.876mhp=hs+760 mm2.636mLoad ptdis from base line to load pt.10.924mhoVert. Dis. Summer loadWL to load pt.2.524mPo=L>90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0234317044N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0185379433N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0344883998N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0177587781N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.042863649N/mm2Maxi. Pr. (maxi of ex. & internal pr.)p max=Pdesign0.042863649N/mm2Design pressurepd =0.042863649N/mm2Sigmas120/k120N/mm2Nominal thickness of platetp=0.5*s*(p/s)8.0323546779mmCorrosion allowance for platetc=2mmtotal thickness of platet =10.0323546779mm10mmProvidedc0.02Minimum thicknesstnmin.(5+cL)k6.9893495685mmtc2mmtmin.(5+cL)k + tc8.9893495685mmCalculation for Side Shell Longitudnal Stiffners (L1 - L4)l =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank7.07mhp=hs+760 mm10.93mLoad ptdis from base line to load pt.2.53mLoad pt. Below summer load waterlinehoVert. Dis. Summer loadWL to load pt.5.87mPo=L>90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0883060503N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0535300122N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0694804687N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0736356013N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.0950906175N/mm2Maxi. Pr. (maxi of ex. & internal pr.)pmax =Pdesign0.0950906175N/mm2dis. of stiffner From base line2530mmSigmas160/k max.160N/mm2Z calculation (Min. required by rule book)Nominal section modulusZns*p*l2*103/(12*s)431.077466cm3Corrosion allowancetc2mmHeight of webhw280mmBreadth of flangebf40mmCorrosion allowance in section modulasZc=tc*hw(bf+0.3*hw)/100069.44cm3Total Z= Zn+Zc500.517466cm3280*12mm Bulb FlatProvided576cm3Calculation for Side Shell Longitudnal Stiffners (L5-L9)l =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank4.15mhp=hs+760 mm8.01mLoad ptdis from base line to load pt.5.45mLoad pt. Below summer load waterlinehoVert. Dis. Summer loadWL to load pt.2.95mPo=L>90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.0518345274N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0338579211N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0498083776N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0539635102N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.0657292875N/mm2Maxi. Pr. (maxi of ex. & internal pr.)pmax =Pdesign0.0657292875N/mm2dis. of stiffner From base line5450mmSigmas160/k160N/mm2Z calculation (Min. required by rule book)Nominal section modulusZns*p*l2*103/(12*s)297.97277cm3Corrosion allowancetc2mmHeight of webhw240mmBreadth of flangebf34mmCorrosion allowance in section modulasZc=tc*hw(bf+0.3*hw)/100050.88cm3Total Z= Zn+Zc348.85277cm3240*9.5mm Bulb FlatProvided350cm3Calculation for Side Shell Longitudnal Stiffners (L 10-12)l =long. Dis from loadpt to tank top corner18.75mb =athwartship. Dis from loadpt to tank top corner1.9mhs =verti. Dis. From LP to top of tank2.25mhp=hs+760 mm3.01mLoad ptdis from base line to load pt.10.55mLoad pt. above summer load waterlinehoVert. Dis. Summer loadWL to load pt.2.15mPo=L>90 m0.024N/mm2Internal tank pressures cargop1 =1.025(g+0.5av)hs/10000.028103057N/mm2Internal tank pressures rollingp2 =0.67*1.025*g(hs+j*b)/10000.0210575878N/mm2 max.Internal tank pressures pitchingp3 =0.67*1.025*g(hs+q*l)/10000.0370080444N/mm2 max.Internal tank pressuresp4 =0.67*1.025*g*hp/10000.0202784227N/mm2Internal tank pressuresp5 =1.025*g*hs/1000+po0.0466243125N/mm2Maxi. Pr. (maxi of ex. & internal pr.)pmax =Pdesign0.0466243125N/mm2dis. of stiffner From base line10550mmSigmas160/k160N/mm2Z calculation (Min. required by rule book)Nominal section modulusZns*p*l2*103/(12*s)211.36355cm3Corrosion allowancetc2mmHeight of webhw200mmBreadth of flangebf28mmCorrosion allowance in section modulasZc=tc*hw(bf+0.3*hw)/100035.2cm3Total Z= Zn+Zc246.56355cm3200*12mm Bulb FlatProvided253cm3
MIdship Z-HRef. From base line (from CL half breadth)Std. Plte sizePlate/stiffnersActual thickness (mm)Nos.b (mm)t (mm)y (mm)A (mm2)A*y (mm3) =( Ai*yi)/Aid = -y (mm)A*d2 (mm4)Iyy = b*t3/12I= Iyy+A.d2Keel Plate181760189136801231203753.55327046133744.5532704613191816571392.011369360191816940752.011Bottom plate161876016814016011212803753.55327046133745.55327046131966328369349.1729900801966331359429.17Inner bottom14194001412001316001579200003753.55327046132553.5532704613858115474549.0022149466.66666667858117624015.669side shell plate11611624002800384001075200003753.5532704613953.553270461334915731440.92581843200000053347731440.9258side shell plate21411424005200336001747200003753.5532704613-1446.446729538770298193550.81161612800000086426193550.8116side shell plate31211220007400240001776000003753.5532704613-3646.4467295387319117770032.7248000000000327117770032.724side shell plate41211224009600288002764800003753.5532704613-5846.4467295387984411053606.41213824000000998235053606.412side shell plate512112187611738225122642458563753.5532704613-7984.44672953871435171282153.8566023493761441773631529.85BHD plate11611624002800384001075200003753.5532704613953.553270461334915731440.92581843200000053347731440.9258BHD plate21411424005200336001747200003753.5532704613-1446.446729538770298193550.81161612800000086426193550.8116BHD plate31211220007400240001776000003753.5532704613-3646.4467295387319117770032.7248000000000327117770032.724BHD plate41011024009600240002304000003753.5532704613-5846.4467295387820342544672.0111520000000831862544672.01BHD plate510110187611738187602202048803753.5532704613-7984.44672953871195976068461.545501957813.333331201478026274.88BHD bottom end plate12110160080016000128000003753.55327046132953.5532704613139575630743.2423413333333.33333142988964076.576Deck plate12119001212800228002918400003753.5532704613-9046.44672953871865910924212.72736001865911197812.7Torsion box stringer plate11900129700228002211600003753.5532704613-5946.4467295387806213214525.106273600806213488125.106Bilge plate (Radius)300014000161272.72727272736400081454545.45454553753.55327046132480.825997734393887848386.11444469000000004840787848386.11Centre girder (web)1750025035008750003753.55327046133503.553270461342962099316.360372916666.666666743035015983.0269Centre girder (flange)11251213115001965003753.55327046133622.553270461319684338295.99481800019684356295.9948Side girder plate312120060043200259200003753.55327046133153.5532704613429619603520.3255184000000434803603520.325Outer Bottom Longitudnals300*118113002053736076588003753.55327046133548.5532704613470445724504.947335200000470780924504.947Inner Bttom Longitudnals280*12812280102836400374192003753.55327046132725.5532704613270402518936.451284000000270686518936.451Side girder longitudnals200*12320012600888053280003753.55327046133153.553270461388310696279.17861380088311310079.178Side Longitudnal (L2)280*1222801229009100263900003753.5532704613853.55327046136629833988.1881512668006631100788.18815L3280*1222801237509100341250003753.55327046133.5532704613114894.15183744812668001381694.15183745L4280*1222801246009100418600003753.5532704613-846.44672953876519895800.1155212668006521162600.11552L5240*9.522409.554506240340080003753.5532704613-1696.446729538717958292598.454362300017958915598.4543L6240*9.522409.563006240393120003753.5532704613-2546.446729538740462599505.400862300040463222505.4008L7240*9.522409.571506240446160003753.5532704613-3396.446729538771983706412.347462300071984329412.3474L8240*9.522409.580006240499200003753.5532704613-4246.4467295387112521613319.294623000112522236319.294L9240*9.522409.588506240552240003753.5532704613-5096.4467295387162076320226.24623000162076943226.24L10200*12220012105505920624560003753.5532704613-6796.4467295387273454793832.947409200273455203032.947L11200*12220012114005920674880003753.5532704613-7646.4467295387346131433719.025409200346131842919.025L12200*12220012122505920725200003753.5532704613-8496.4467295387427362473605.102409200427362882805.102L1280*121280122050455093275003753.55327046131703.553270461313204526541.112263340013205159941.1122L1a280*121280121478455067249003753.55327046132275.553270461323560549224.517463340023561182624.5174L1b280*1212801222004550100100003753.55327046131553.553270461310981551326.932663340010982184726.9326Stringer plate longitudnal280*1221228097009100882700003753.5532704613-5946.4467295387321778081235.898409200321778490435.898Deck longitudnal280*122122801280091001164800003753.5532704613-9046.4467295387744727605716.471409200744728014916.471Sum9360623513558581.454553753.553270461315407190744899.5457877530669619985966051595.5INA half19985966051595.5INA full39.9719321032m4INA full39971932103191.1mm4for deck tD-9046.4467295387Section Modulus of midshipZ=INA full/10649091466.9445mm3ZtopINA full/t4418522907.19555mm3Z=INA full/10649091.4669445cm3ZtopINA full/t4418522.90719556cm3ZbottomINA full/10.6490914669m3ZtopINA full/t4.4185229072m3Stress at bottomsBM/ZB100.0952638508N/mm2Stress at decksDM/ZD4.4185229072N/mm2
JE1:not calculatedfrom parent shipt=12.5 AH graderadha:check "t" for buckling
MIdship Z-VRef. From side shellStd. Plte sizePlate/stiffnersActual thickness (mm)Nos.b (mm)t (mm)y (mm)A (mm2)A*y (mm3) = A*y/Ad = -y (mm)A*d2 (mm4)Iyy = b*t3/12I= Iyy+A.d2Keel Plate17.54219127371227500165000000773437500773437500Double Bttom plate15.54219127371161000050001600008000000000-500040000000000001333333333333.335333333333333.33Inner bottom13.132002824511612200610019520011907200000-610072633920000002421130666666.679684522666666.67side shell plate114.4631536232128001414200392005566400000-142007904288000000640266.6666666677904288640266.67side shell plate28.9893495685128001414200392005566400000-142007904288000000640266.6666666677904288640266.67side shell plate314.53408128001414200392005566400000-142007904288000000640266.6666666677904288640266.67side shell plate414.53408120001414200280003976000000-142005645920000000457333.3333333335645920457333.33side shell plate514.53408120001814200360005112000000-1420072590400000009720007259040972000side shell plate614.53408120002814200560007952000000-14200112918400000003658666.6666666711291843658666.7BHD plate10128001812200504006148800000-12200750153600000013608007501537360800BHD plate20128001612200448005465600000-122006668032000000955733.3333333336668032955733.33BHD plate30128001412200392004782400000-122005834528000000640266.6666666675834528640266.67BHD plate40120001412200280003416000000-122004167520000000457333.3333333334167520457333.33BHD plate514.53408120001812200360004392000000-1220053582400000009720005358240972000BHD plate614.53408120002812200560006832000000-1220083350400000003658666.666666678335043658666.67Deck plate128200013200560007392000000-13200975744000000018666666666.66679776106666666.67Torsion box stringer plate116200013200320004224000000-13200557568000000010666666666.66675586346666666.67coming plate114451612200231202820640000-122003441180800000493226.6666666673441181293226.67Bilge plate (Radius)350011849041484.848484848588272131070545.4545450-1484.8484848485194619900826.44682384312500008433051150826.45Centre girder (web)15006.503250000011442.708333333311442.7083333333Centre girder (flange)113100501300650000-5032500001083333.333333334333333.33333333Side girder plate11160014130022400291200000-130037856000000365866.66666666737856365866.6667Side girder plate21160014385022400862400000-3850332024000000365866.666666667332024365866.667Side girder plate311600147100224001590400000-71001129184000000365866.6666666671129184365866.67Side girder plate411600149650224002161600000-96502085944000000365866.6666666672085944365866.67Side girder plate511294.6141220018124.42211176800-122002697635696000296031.8666666672697635992031.87DB Longitudnals (web)1300*1113001130033009900000-30029700000033275297033275(flange)190*11111902559902524500-2556437475066825065043000IB Longitudnals (web)1250*1112501130027508250000-30024750000027729.1666666667247527729.166667(flange)190*11111902559902524500-2556437475066825065043000DB longitudnals (web)2300*111300111150330037950000-11504364250000332754364283275(flange)290*1111190110599010939500-110512088147506682501209483000IB Longitudnals (web)2250*111250111150275031625000-1150363687500027729.16666666673636902729.16667(flange)290*1111190110599010939500-110512088147506682501209483000DB longitudnals (web)3300*111300112000330066000000-2000132000000003327513200033275(flange)390*1111190195599019354500-195537838047506682503784473000IB Longitudnals (web)3250*111250112000275055000000-20001100000000027729.166666666711000027729.1667(flange)390*1111190195599019354500-195537838047506682503784473000DB longitudnals (web)4300*111300112850330094050000-2850268042500003327526804283275(flange)490*1111190280599027769500-280577893447506682507790013000IB Longitudnals (web)4250*111250112850275078375000-28502233687500027729.166666666722336902729.1667(flange)490*1111190280599027769500-280577893447506682507790013000DB longitudnals (web)5300*1113001137003300122100000-3700451770000003327545177033275(flange)590*1111190365599036184500-36551322543475066825013226103000IB Longitudnals (web)5250*1112501137002750101750000-37003764750000027729.166666666737647527729.1667(flange)590*1111190365599036184500-36551322543475066825013226103000DB longitudnals (web)6300*1113001145503300150150000-4550683182500003327568318283275(flange)690*1111190450599044599500-45052009207475066825020092743000IB Longitudnals (web)6250*1112501145502750125125000-45505693187500027729.166666666756931902729.1667(flange)690*1111190450599044599500-45052009207475066825020092743000DB longitudnals (web)7300*1113001154003300178200000-5400962280000003327596228033275(flange)790*1111190535599053014500-53552838926475066825028389933000IB Longitudnals (web)7250*1112501154002750148500000-54008019000000027729.166666666780190027729.1667(flange)790*1111190535599053014500-53552838926475066825028389933000DB longitudnals (web)8300*1113001162503300206250000-625012890625000033275128906283275(flange)890*1111190620599061429500-62053811700475066825038117673000IB Longitudnals (web)8250*1112501162502750171875000-625010742187500027729.1666666667107421902729.167(flange)890*1111190620599061429500-62053811700475066825038117673000DB longitudnals (web)9300*1113001171003300234300000-710016635300000033275166353033275(flange)990*1111190705599069844500-70554927529475066825049275963000IB Longitudnals (web)9250*1112501171002750195250000-710013862750000027729.1666666667138627527729.167(flange)990*1111190705599069844500-70554927529475066825049275963000DB longitudnals (web)10300*1113001179503300262350000-795020856825000033275208568283275(flange)1090*1111190790599078259500-79056186413475066825061864803000IB Longitudnals (web)10250*1112501179502750218625000-795017380687500027729.1666666667173806902729.167(flange)1090*1111190790599078259500-79056186413475066825061864803000Side girder longitudnals (web)1125*102101251937.5125048437500-1937.54692382812.53255208.333333334695638020.83333(flange)115*102151020001506000000-20006000000002500600002500Side girder longitudnals (web)2125*102101254487.51250112187500-4487.525172070312.53255208.3333333325175325520.8333(flange)215*1021510455015013650000-4550310537500025003105377500Side girder longitudnals (web)3125*102101257037.51250175937500-7037.561908007812.53255208.3333333361911263020.8333(flange)315*1021510710015021300000-7100756150000025007561502500Side girder longitudnals (web)4125*102101259587.51250239687500-9587.5114900195312.53255208.33333333114903450520.833(flange)415*1021510965015028950000-965013968375000250013968377500Side Longitudnal (web) 17-18300*11211300140503300927300000-1405065142825000049500000651477750000(flange) 17-1890*112901113900990275220000-1390019127790000019965191277919965BHD Longitudnal (web) 17-18300*11211300120503300795300000-1205047916825000049500000479217750000(flange) 17-1890*112901111900990235620000-1190014019390000019965140193919965Side Longitudnal (web) 19-23250*115112501407527501935312500-1407554479046875071614583.3333333544862083333.333(flange) 19-2390*115901113950990690525000-1395019265647500049912.5192656524912.5BHD Longitudnal (web) 19-23250*115112501207527501660312500-1207540096546875071614583.3333333401037083333.333(flange) 19-2390*115901111950990591525000-1195014137447500049912.5141374524912.5Side Longitudnal (web) 24-26200*11311200141002200930600000-1410043738200000022000000437404000000(flange) 24-2690*113901114000990415800000-1400019404000000029947.5194040029947.5BHD Longitudnal (web) 24-26200*11311200121002200798600000-1210032210200000022000000322124000000(flange) 24-2690*113901112000990356400000-1200014256000000029947.5142560029947.5Side Longitudnal (web) 27-28150*11211150141251650466125000-141253292007812506187500329206968750(flange) 27-2890*112901114050990278190000-1405019542847500019965195428494965BHD Longitudnal (web) 24-26150*11211150121251650400125000-121252425757812506187500242581968750(flange) 24-2690*112901112050990238590000-1205014375047500019965143750494965Side Longitudnal (web)30-32240*273272401408064802737152000-140801284636672000933120001284729984000BHD Longitudnal (web)30-32240*273272401208064802348352000-1208094560307200093312000945696384000Torsion box longitudnal 1(web)150*12115012128001800230400000-12800294912000000216002949120216001(flange)90*1211290127551080137754000-12755175705227000729000175705956000(web)2150*12115012135001800243000000(flange)290*1211290134551080145314000Deck longitudnal (flange)1260*27126027129007020905580000-1290011681982000004264651168198626465Deck longitudnal (flange)2260*27126027136000hatchcoming longitudnal (web) 1350*15115350123755250649687500-1237580398828125053593750804041875000(flange) 1100*15110015125501500188250000-1255023625375000028125236253778125web 2125*1111112512262.5137516860937.50-12262.5206757246093.751790364.58333333206759036458.333Sum1322851.413024723112.9545013422405892142012023589484860.8146247648406281INA half146247648406281146247648406281INA full292495296812562Section Modulus of midship at sideZ=INA full/20598260338.9128mm3Z=INA full/20598260.3389128cm3ZbottomINA full/20.5982603389m3
JE1:not calculatedfrom parent shipt=12.5 AH gradeHTS PlateHTS PlateHTS PlateHTS PlateTorsion box plateTorsion box plateHTS PlateHTS PlateHTS PlateHTS plateTorsion box plateTorsion box plate
Buckling calLength between perpendicularLbp =148mLOA158LENGTH (scantling)L =145.69mBREADTH moldedB =22.6mDRAFT (scantling)T =8.4mDEPTH of TankDt=9.6mBlock co.Cb =0.67speedV=17knotsmaterial factork0.78HTSk1Mild steelmodulus of elasticityE206000N/mm2BucklingIdeal elastic buckling stress (for deck plate)Stiffner spacings700mmWeb frame spacingl3.2mTotal thickness of deck platingt12mmCorrosion allowance for deck platetc2mmmini. Yield strengthsy175N/mm2ratio b/w smaller & larger value of compressive stressYY= D1/D21C1.05 when stiffner are flat bar1.05for plating with stiffner in dir. of compressive stressK18.4/(1.1+Y)4for plating with stiffner in dir. of perpedicular to compressive stressK2C[1+(s/1000*l)2]2*2.1/(Y+1.1)1.1528925419(in dir. of comp. Stress)sE0.9*K1*E[(t-tc)/s]2151.3469387755N/mm2(^ to comp. Stress)sE0.9*K2*E[(t-tc)/s]343.6216892379N/mm2The compressive buckling stress may be determine as followssc value for plate & stiffners taking part in longitudbal strengthsc(MS+MW)*105/Z (for deck Z=ZD)154.1944506635N/mm2should not be less than 30/k30/k38.4615384615N/mm2h=1 for deck, longitudnally stiffened side shell1Critical buckling stress of plate & stiffnersscrscr sc/h154.1944506635N/mm2Critical compressive stress (^ to comp. Stress)scrscr = sE when sE 0.5*sy43.6216892379N/mm2Critical compressive stress (in dir. of comp. Stress)scrscr=sy*(1-sy/4sE) when sE >0.5*sy124.4125876483N/mm2Deck plate is safe as per buckling criteria actual scr > as per induced
Trans. W.T.BHD stiff,plateMain perticularsLength between perpendicularLBP =186mLength overallLOA=196.2LENGTH (scantling)L =188.352mBREADTH moldedB =28.4mDRAFT (scantling)T =11.2mBlock co.Cb =0.67speedV=18knotsmaterial factork1Mild steelk0.78HTSgravitational accelerationg9.81m/s2Cw10.75-[(300-L)/100]^3/29.5702868467Cv0.2 for L>100 m0.2common acceleration perameterao3Cw/L+Cv*V/SQRT(L)0.4147434701Rsfor unrestricated service1roll redius of gyrationKr0.39B11.076mmetacentric HeightGM0.07B1.988mperiod of rollTr(2kr/sqrt(GM))15.7110334297secc(1.25-0.025Tr)d0.8572241643Roll anglej50c/(B+75)0.4145184547radianspitch angleq0.25ao/Cb0.1547550262radianskv0.7 b/w 0.3L to 0.6L0.7ks0.2L to 0.7L from AP3.5combined vertical accelerationavkv*g*ao/Cb4.25081105860.3L
