API 650 Tank Design 5

DESIGN OF STEEL STORAGE TANKS AS PER API-650 (Diameter 131.7 then Cma= {149000000*Y}/{(L/r)^2[1.6-(L/r*200)] Where Cma= Max. allowable compression, in PSI L = Unbraced length of column, in inches r = Least radius of gyration of column, in inches Y = 1 for structural or tubular section that have t/r value greater than or equal to 0.015 For tubular section that have t/r values < 0.015 Y = {(200/3)(t/R)}{2-(200/3)(t/R)} t/r

Cma PSI

Cinduced PSI

Stress

Buckling

0.099

6658.34

1172.22

Safe

Safe

\\vboxsrv\conversion_tmp\scratch_6\[227940844.xls.ms_office.xls]TANK DESIGN

CENTER COLUMN DESIGN INPUTS OUTPUTS

Load on Inner rafter lbs.

Wt. of inner rafter lbs.

31648.13

4126.240

Total wt. on Selected Center column Member lbs. 3 17887.183 ########

Size of Member DN

Length of Column (L) feet

Unit wt. lbs/ft

Misc. wt. lbs.

250

51.9224

40.5600

661.5

CHECKING OF COLUMN IN COMPRESSION See section 3.10.3.3 on page 3-44 of API - 650 If L/r < 120 then Cma= [1-(L/r)^2/34700](33000/Fs)*Y If 120 < L/r < 131.7 then Cma= {[1-(L/r)^2/34700](33000/Fs)*Y}/[1.6*(L/200*r)] When L/r > 131.7 then Cma= {149000000*Y}/{(L/r)^2[1.6-(L/r*200)] Where Cma= Max. allowable compression, in PSI L = Unbraced length of column, in inches r = Least radius of gyration of column, in inches Y = 1 for structural or tubular section that have t/r value greater than or equal to 0.015 For tubular section that have t/r values < 0.015 Y = {(200/3)(t/R)}{2-(200/3)(t/R)} t/r

Cma PSI

Cinduced PSI

Stress

Buckling

0.099

6888.664988

1502.235

Safe

Safe

DESIGN OF STEEL STORAGE TANKS AS PER API-650 (Diametet greater than 10 m but less than 20m) Supported Cone Roof Without Column DESIGN DATA

Total wt. Outside Inside of ColumnDiameter Diameter lbs. (R)inches inches ###### 10.750

10.020

Radius ofSlenderness Gyration Ratio (r) inches L/r 3.674

169.592

Service Capacity Type of tank Dia of tank (feet) Height of tank (feet) Slope of roof Slope of bottom Plate Data Plate width (meter) Plate height (meter) Den. of mat. (Kg/m 3)

HFO 2739 m^3 Supported cone roof 49.20 50.84 1:5 1:100.

Allowable Design Stress (Sd) PSI Allowable Test Stress (St) PSI Specific Gravity of Liquid (G) Corrosion Allowance (CA)

23200 24900 0.96 0.118

See Table 3-2 on page 3-7 of API - 650

Full coarse Full width Full coarse Partial width Partial coarse Full width Partial coarse Partial width

2.439 1.2195 7850

A B C D

Width 1220 1220 983 983

Course # from bottom of tank

1 2 3 4 5 6 7 8 9 10 11 12 13

Liq. height in tank (H) ft 50.8 46.8 42.8 38.8 34.8 30.8 26.8 22.8 18.8 14.8 10.8 6.8 2.8

By one foot method. See sec. 3.6.3.2 on page 3-7 of API - 650 Height of Design shellDesign shell Hyd. shell each Course thickness thickness thickness (td) (td) (tt) mm inches mm inches 1220 1220 1220 1220 1220 1220 1220 1220 1220 1220 1220 1220 866

0.382 0.361 0.340 0.318 0.297 0.276 0.255 0.234 0.213 0.191 0.170 0.149 0.128

10.0 10.0 9.0 9.0 8.0 8.0 7.0 6.0 6.0 5.0 5.0 4.0 4.0

0.256 0.235 0.215 0.194 0.174 0.153 0.133 0.112 0.092 0.071 0.051 0.030 0.009

Adopted shell thickness

Selected Min. shell thickness

(mm)

(mm)

10 10 9 9 8 8 7 7 7 7 7 7 7

10 10 9 9 8 8 7 7 7 7 7 7 7

According to sec. 3.6.1.1 min. thk.of tank of dia. 50ft to