7/28/2019 mkju bvfg vfgb

http://slidepdf.com/reader/full/mkju-bvfg-vfgb 1/5

 

 Nominal Diameter of Bolts BND 1.0000 in.Bolt Corrosion Allowance BCA 0.0000 in.Bolt Material SA-193 B7Bolt Operating Allowable Stress SA 25000.00 psi Number of Bolts RN 8Diameter of Bolt Circle DC 101.7500 in.

Are Gussets to be used Yes/No GUSYN N

External Corrosion Allowance CA 0.0000 in.

Dead Weight of Vessel DW 5954.3 lb.Operating Weight of Vessel ROW 5954.3 lb.Earthquake Moment on Basering EQMOM 0.0 ft.lb.Wind Moment on Basering WIMOM 9479.4 ft.lb.Percent Bolt Preload ppl 100.0

Use AISC A5.2 Increase in Fc and Bolt Stress NoUse Allowable Weld Stress per AISC J2.5 No

Factor for Increase of Allowables Fact 1.0000

Results for Basering Analysis : Analyze Option

Calculation of Load per Bolt [W/Bolt],W TW M Test Moment

4 * M/DC - W / RN per Jawad & Farr, Eq. 12.34 * 0 / 101.750 - 0 / 80.0000 lb. [** No Uplift ** ]

Required Area for Each Bolt, Based on Max Load 0.0000 in²Area Available in a Single Bolt Corr 0.5510 in²Area Available in all the Bolts Corr 4.4080 in²Bolt Stress Based on Approximate Analysis 0.0 psiAllowable Bolt Stress 25000.0 [Fact] 25000.000 psi

Concrete Contact Area of Base Ring CCA 1586.50 in²

7/28/2019 mkju bvfg vfgb

http://slidepdf.com/reader/full/mkju-bvfg-vfgb 2/5

Concrete Contact Section Modulus of Base Ring 38263.19 in.³

Calculation of Concrete Load, Wind in Operating Condition [Sc]: ppl/100*Abt*Sa+W/Cca + M/CZ per Jawad & Farr Eq. 12.11.000 4.4080 *25000 +5954 /1586.50 + 113752 /38263.19

76.19 psi Note: N. A. Shift Calculations not performed due to low bending moment.

Determine Maximum Bending Width of Basering Section [Rw1,Rw2]:Rw1 Dou - SkirtOD/2, Rw2 SkirtID - Di + 2*Sca /2Rw1 106.000 -96.500 /2, Rw2 96.000 -96.000 + 2*0.125 /2Rw1 4.750 , Rw2 0.125 in.

Calculation of required Basering Thickness, Simplified [Tb]:Allowable Bending Stress 1.5 Basope 30000.000 psi

MaxRw1,Rw2 * 3 * Sc / S ½ + CA per Jawad & Farr Eq. 12.12Max4.7500 ,0.1250 * 3 * 76.187 / 30000.000 ½ + 0.00000.4146 in.

Basering Stress at given Thickness [Sb]3 * Sc * Max[Rw1, Rw2]/Tb - Ca ²3 * 76.187 * Max[4.750 , 0.125 ]/1.000 - 0.000 ²5156.898 , must be less than 30000.000 psi

Summary of Basering Thickness Calculations:Required Basering Thickness simplified 0.4146 in.Actual Basering Thickness as entered by user 1.0000 in.

Weld Size Calculations per Steel Plate Engineering Data - Vol. 2

Compute the Weld load at the Skirt/Base Junction [W]SkirtStress * SkirtThickness - CA282.237 * 0.250 - 0.12535.28 lb./in.

Results for Computed Minimum Basering Weld Size [BWeld]W / [ 0.4 * Yield * 2 * 0.707]35 / [ 0.4 * 38000 * 2 * 0.707]0.002 in.

Summary of Required Weld Sizes:Required Basering to Skirt Double Fillet Weld Size 0.1875 in.

PVElite is a registered trademark of COADE, Inc. [2009]

7/28/2019 mkju bvfg vfgb

http://slidepdf.com/reader/full/mkju-bvfg-vfgb 3/5

 

Post a Reply... 

 Re: Skirt design - Thursday, January 14, 2010 - Estimator [458]

Our design engineer had this response:I think that for a skirt to be anchored, it needs a base ring, and that is where thecalculations are performed. See my example below. In the report, if anyvalues/thicknesses are “badâ€, they show up in red. If you don’t see red, you are

good to go. Personally, I would like to see a statement that says I’m good, rather than

nothing.

Skirt Data :Skirt Outside Diameter at Base SOD 96.5000 in.Skirt Thickness STHK 0.2500 in.Skirt Internal Corrosion Allowance SCA 0.1250 in.Skirt External Corrosion Allowance 0.0000 in.Skirt Material SA-516 70

Basering Input: Type of Geometry: Simple Basering No Gussets

Thickness of Basering TBA 1.0000 in.Design Temperature of the Basering 100.00 FBasering Matl SA-516 70Basering Operating All. Stress BASOPE 20000.00 psiBasering Yield Stress 38000.00 psiInside Diameter of Basering DI 96.0000 in.Outside Diameter of Basering DOU 106.0000 in.

 Nominal Diameter of Bolts BND 1.0000 in.Bolt Corrosion Allowance BCA 0.0000 in.Bolt Material SA-193 B7Bolt Operating Allowable Stress SA 25000.00 psi Number of Bolts RN 8Diameter of Bolt Circle DC 101.7500 in.

Are Gussets to be used Yes/No GUSYN N

External Corrosion Allowance CA 0.0000 in.

7/28/2019 mkju bvfg vfgb

http://slidepdf.com/reader/full/mkju-bvfg-vfgb 4/5

Dead Weight of Vessel DW 5954.3 lb.Operating Weight of Vessel ROW 5954.3 lb.Earthquake Moment on Basering EQMOM 0.0 ft.lb.Wind Moment on Basering WIMOM 9479.4 ft.lb.Percent Bolt Preload ppl 100.0

Use AISC A5.2 Increase in Fc and Bolt Stress NoUse Allowable Weld Stress per AISC J2.5 No

Factor for Increase of Allowables Fact 1.0000

Results for Basering Analysis : Analyze Option

Calculation of Load per Bolt [W/Bolt],W TW M Test Moment

4 * M/DC - W / RN per Jawad & Farr, Eq. 12.34 * 0 / 101.750 - 0 / 80.0000 lb. [** No Uplift ** ]

Required Area for Each Bolt, Based on Max Load 0.0000 in²Area Available in a Single Bolt Corr 0.5510 in²Area Available in all the Bolts Corr 4.4080 in²Bolt Stress Based on Approximate Analysis 0.0 psiAllowable Bolt Stress 25000.0 [Fact] 25000.000 psi

Concrete Contact Area of Base Ring CCA 1586.50 in²Concrete Contact Section Modulus of Base Ring 38263.19 in.³

Calculation of Concrete Load, Wind in Operating Condition [Sc]: ppl/100*Abt*Sa+W/Cca + M/CZ per Jawad & Farr Eq. 12.11.000 4.4080 *25000 +5954 /1586.50 + 113752 /38263.1976.19 psi

 Note: N. A. Shift Calculations not performed due to low bending moment.

Determine Maximum Bending Width of Basering Section [Rw1,Rw2]:Rw1 Dou - SkirtOD/2, Rw2 SkirtID - Di + 2*Sca /2Rw1 106.000 -96.500 /2, Rw2 96.000 -96.000 + 2*0.125 /2Rw1 4.750 , Rw2 0.125 in.

Calculation of required Basering Thickness, Simplified [Tb]:Allowable Bending Stress 1.5 Basope 30000.000 psiMaxRw1,Rw2 * 3 * Sc / S ½ + CA per Jawad & Farr Eq. 12.12Max4.7500 ,0.1250 * 3 * 76.187 / 30000.000 ½ + 0.00000.4146 in.

7/28/2019 mkju bvfg vfgb

http://slidepdf.com/reader/full/mkju-bvfg-vfgb 5/5

 Basering Stress at given Thickness [Sb]3 * Sc * Max[Rw1, Rw2]/Tb - Ca ²3 * 76.187 * Max[4.750 , 0.125 ]/1.000 - 0.000 ²5156.898 , must be less than 30000.000 psi

Summary of Basering Thickness Calculations:Required Basering Thickness simplified 0.4146 in.Actual Basering Thickness as entered by user 1.0000 in.

Weld Size Calculations per Steel Plate Engineering Data - Vol. 2

Compute the Weld load at the Skirt/Base Junction [W]SkirtStress * SkirtThickness - CA282.237 * 0.250 - 0.125

35.28 lb./in.Results for Computed Minimum Basering Weld Size [BWeld]W / [ 0.4 * Yield * 2 * 0.707]35 / [ 0.4 * 38000 * 2 * 0.707]0.002 in.

Summary of Required Weld Sizes:Required Basering to Skirt Double Fillet Weld Size 0.1875 in.

PVElite is a registered trademark of COADE, Inc. [2009]