API 650 Tank Design 1foot Method
Short Description
One foot method to calculate tank wall thickness per API 650. For reference only. Refer to the latest API 650 code for f...
Description
07/29/2015 Rev: 0
API 650 Storage Tank
TANK [tag] SHELL PLATE DESIGN CALCULATION by ONE FOOT METHOD D = Normal tank diameter , in feet
7.00
H = depth of tank , in feet
6.00
Shell Plate Design :
2.1 meters 1.8 meters
FROM ( BOTTOM COURSE) PLATE TO (TOP COURSE) PLATE
SG = design Specific gravity of liquid Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance For First Course (Bottom) A36 Plate ;
Provided thickness:
0.9 23,200 1.00
160 Mpa
24,900 0.1180
171 Mpa 3.00 mm
20mm
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
0.004
0.09 mm
tt = 2.6(D)(H-1)/St =
0.004
0.09 mm
0.122 7.00 6.00 1.00 23,200 1.00
3.090 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet = H = depth of tank , in feet = SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance For Second Course A36 Plate
24,900 0.1180
Provided thickness:
18.000
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
0.004
0.10 mm
tt = 2.6(D)(H-1)/St =
0.004
0.09 mm
0.066 7.00 0 1.00 23,200 1.00 24,900 0.0625
1.68 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet H = depth of tank , in feet SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance For Third Course A36 Plate
Provided thickness:
16.000
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
-0.001
-0.02 mm
tt = 2.6(D)(H-1)/St =
-0.001
-0.02 mm
0.062 7.00 0 1.00 23,200 1.00 24,900 0.0625
1.57 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet H = depth of tank , in feet SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance
Seth A. Duazo Nass Mechanical
Page 1 of 4
FileName: 277905726.xls WorkSheet: Tank tag
07/29/2015 Rev: 0
API 650 Storage Tank
TANK [tag] SHELL PLATE DESIGN CALCULATION by ONE FOOT METHOD D = Normal tank diameter , in feet
7.00
H = depth of tank , in feet
6.00
For Fourth Course A36 Plate
Provided thickness:
2.1 meters 1.8 meters
12.000
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
-0.001
-0.02 mm
tt = 2.6(D)(H-1)/St =
-0.001
-0.02 mm
0.062 7.00 26.3632 1.00 21,300 1.00 24,900 0.0625
1.57 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet H = depth of tank , in feet SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance For Fifth Course A36 Plate
Provided thickness:
10mm
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
0.022
0.55 mm
tt = 2.6(D)(H-1)/St =
0.019
0.47 mm
0.081 7.00 19.754 1.00 21,300 1.00 24,900 0.0625
2.06 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet H = depth of tank , in feet SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance For Sixth Course A36 Plate
Provided thickness:
8mm
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
0.014
0.37 mm
tt = 2.6(D)(H-1)/St =
0.014
0.35 mm
0.076 7.00 13.194 0.9 21,300 1.00 24,900 0.0625
1.94 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet H = depth of tank , in feet SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance For Seventh Course A36 Plate
Provided thickness:
8mm
As per API 5.6.3.2 In US Customary units;
td = 2.6(D)(H -1)(SG)/Sd =
0.010
0.26 mm
tt = 2.6(D)(H-1)/St =
0.009
0.23 mm
0.071 7.00 6.63 1 21,300 1.00 24,900 0.0625
1.81 mm
td = Minimum shell course thickness plus C.A, in inches = D = Normal tank diameter , in feet H = depth of tank , in feet SG = design Specific gravity of liquid = Sd = allowable Stress for Design condition E = joint efficiency St = allowable stress A36 Hydro Test CA = Corrosion Allowance Seth A. Duazo Nass Mechanical
Page 2 of 4
FileName: 277905726.xls WorkSheet: Tank tag
07/29/2015 Rev: 0
API 650 Storage Tank
TANK [tag] SHELL PLATE DESIGN CALCULATION by ONE FOOT METHOD D = Normal tank diameter , in feet
7.00
H = depth of tank , in feet
6.00
2.1 meters 1.8 meters
BOTTOM PLATE DESIGN: As per API 650 11th Ed. 2009 Add. 2 Sect. 5.4.1;
Minimum Nominal Thickness excluding corrosion allowance, Inch Corrosion Allowance for Bottom Plate Required Thickness of Bottom Plate Used bottom plate thickness Minimum Nominal Width, Inch Used bottom plate Width,in
0.25 0.125 0.25 0.375 70.866 78.74
6.35 3.18 6.35 10 1800.0 2000.0
mm mm mm mm mm mm
ANNULAR BOTTOM PLATE DESIGN: As per API 650 11th Ed. 2009 Add. 2 Sect. 5.5.2;
Minimum Annular plate Width shall be =
215 tb ( GH )
or a Minimum of Annular Plate width provided; in
28.62
727 mm
23.622
600 mm
0.5
29.92 Where: tb = Annular plate thickness, mm H = maximum Design Liquid level, Meter G = liquid Specific gravity
760 mm
HENCE, OK.
ROOF PLATE DESIGN: ( Non Frangible roof Tank) As per API 650 11th Ed. 2009 Add. 2 Sect. 5.10.2.2,
Minimum Nominal Thickness excluding corrosion allowance = Corrosion Allowance for Roof Plate, = Required Thickness of Roof Plate = Used roof plate thickness =
0.1875 0 0.1875 0.1875
5 0 5 5
mm mm mm mm
SHELL STABILITY CHECK; As per API 650 11th Ed. 2009 Add. 2 Sect. 5.9.7.1
The Maximum height for the unstiffined shell shall be calculated as follows: H1 = 600,000*(t)*(((t/D)^3)^0.5)*(120 /V)^2 = , ft
23.82 7.26 Meters Where; H1 = Vertical Distance in ft, betwwen the intermediate wind girder and the top angle of the shell or the top wind girder of an open top tank t = as built thickness, unless otherwise specified of the thinnest shell course (in Inches) D = Nominal Tank height, Ft V = Designed wind speed (3 sec gust)mph
Seth A. Duazo Nass Mechanical
Page 3 of 4
FileName: 277905726.xls WorkSheet: Tank tag
07/29/2015 Rev: 0
API 650 Storage Tank
TANK [tag] SHELL PLATE DESIGN CALCULATION by ONE FOOT METHOD D = Normal tank diameter , in feet
7.00
H = depth of tank , in feet
6.00
Equivalent stable height of shell at ' t ' min. HE = sum He He = W( ' t 'min / ' t 'actual)^2.5 As per API 650 11th Ed. 2009 Add. 2 Sect. V.8.1.4 (b) Course Width (M) t' min (mm) 1 1.995 20.00 2 1.995 16.00 3 1.995 15.00 4 2.0 12.00 5 2.0 10.00 6 2.0 8.00 7 2.0 8.00 Minimum Shell Thickness = 8mm Transformed shell height,
W' tr
Maximum height of unstiffined shell=
2.1 meters 1.8 meters
Wtr (Meter) 0.202 0.353 0.414 0.726 1.145 2.000 2.000
6.840
Meters
7.26 Meters
H1 > Wtr, hence intermediate wind girder is not required
Seth A. Duazo Nass Mechanical
Page 4 of 4
FileName: 277905726.xls WorkSheet: Tank tag
View more...
Comments
