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Tank Calculation PDF

This document provides calculations for the design of a storage tank according to API 650 standards. It includes the geometric data, materials, and mechanical properties used. A one-foot method is employed to calculate the minimum required shell thickness according to factors like the tank diameter, height, and material properties. The results show the calculated, minimum, and selected shell thicknesses for 9 courses meet requirements. Maximum allowable stresses are also calculated.

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Alvin Smith
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5K views3 pages

Tank Calculation PDF

This document provides calculations for the design of a storage tank according to API 650 standards. It includes the geometric data, materials, and mechanical properties used. A one-foot method is employed to calculate the minimum required shell thickness according to factors like the tank diameter, height, and material properties. The results show the calculated, minimum, and selected shell thicknesses for 9 courses meet requirements. Maximum allowable stresses are also calculated.

Uploaded by

Alvin Smith
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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STORAGE TANK DESIGN CALCULATION - API 650

1 .0

1 .1

1 .2

1 .3

1 .4

DESIGN CODE & SPECIFICATION


DESIGN CODE

: API 650 11th Edition

TANK
Item number
Roof ( Open/Close )
Type of roof ( Cone-roof / Dome-roof / Flat-roof / NA )

: 7061T-3901
: Close
: Floating Roof

GEOMETRIC DATA
Inside diameter , Di ( corroded ) (@
39,000
mm )
Nominal diameter, Dn ( new ) ( based on 1st shell course )
Nominal diameter, Dc ( corroded ) ( based on 1st shell course )
Tank height (tan/tan), H
Specific gravity of operating liquid , S.G. (Actual)
Specific gravity of operating liquid , S.G. (Design)
Nominal capacity , V
Maximum design liquid level, HL

=
=
=
=
=
=
=
=

39,006
39,028
39,031
20,700
0.790
1.00
24736
20,700

(Atmospheric) =
=
=
=

0.00
0.00
70
-17

PRESSURE & TEMPERATURE


Design pressure
: Upper , Pu
: Lower , Pl
Design temperature
: Upper , Tu
: Lower , Tl
MATERIAL & MECHANICAL PROPERTIES
Component

PLATE
Shell Plate

( Mat'l Code # 1 ) (bot)


( Mat'l Code # 2 ) (top)

Annular Plate
Bottom Plate
Roof Plate
STRUCTURE MEMBERS
Roof structure (rafter,bracing,etc )
Top Curb Angle
Intermediate Wind Girder

Material

Tensile
Stress
St(N/mm)

Yield
Stress
Sy(N/mm)

Corrosion
Allowance
c.a.(mm)

A 516 GR. 65N


A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N

448.00
448.00
448.00
448.00
448.00

241.00
241.00
241.00
241.00
241.00

3.000
3.000
3.000
3.000
3.000

A 516 GR. 65N


A 516 GR. 65N
A 516 GR. 65N

448.00
448.00
448.00

241.00
241.00
241.00

3.00
3.00
3.00

mm
mm
mm
mm

m
mm

mbarg
mbarg Vac
C
C

SHELL THICKNESS CALCULATION BY ONE-FOOT METHOD


SHELL DESIGN
GEOMETRIC DATA
Plate size used
PTS 34.51.01.31 clause 6.3
Shell plate min. width as per

2 .0
2 .1

2 .2

2,440 mm
1,500 mm

MATERIAL & MECHANICAL PROPERTIES

No

1
2
3
4
5
6
7
8
9
10

2 .3

Material
used

A 516 GR. 65N


A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
-

Specified Specified Yield stress Max. allow Max. allow


min. tensile min. yield reduction fac
design
hydro.test
stress
stress
( App. M )
stress
stress
St (N/mm) Sy (Nmm)
k
Sd (N/mm) St (N/mm)
448.00
448.00
448.00
448.00
448.00
448.00
448.00
448.00
448.00
-

241.00
241.00
241.00
241.00
241.00
241.00
241.00
241.00
241.00
-

1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
-

160.67
160.67
160.67
160.67
160.67
160.67
160.67
160.67
160.67
-

Corrosion
allowance
c.a (mm)

180.75
180.75
180.75
180.75
180.75
180.75
180.75
180.75
180.75
-

SPECIFIED MINIMUM SHELL THICKNESS


Specification
Minimum thickness as per
API 650 cl 5.6.1.1
PTS 34.51.01.31
Minimum thickness as per

2 .4

3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
3.00
-

: API 650 11th Edition


=
8.00 mm
=
11.00 mm

SHELL THICKNESS CALCULATION BY ONE-FOOT METHOD ( CLAUSE 5.6.3.1 )


SI METRIC UNIT :Design shell thickness, ( in mm )
4.9Dc ( [H+Hi] - 0.3 ).G
td =
+ c.a
Sd
Hydrostatic test shell thickness , ( in mm )
4.9Dn ( H - 0.3 )
tt =
St
Gravitational force =
9.81
m/s

2 .5

t.min = Min. of t.design, t.hydo &


min. thickness as per PTS.
tsc = Thicknes selected & used

CALCULATION & RESULTS

No. Mat'l
Code
No.
1
2
3
4
5
6
7
8
9

:
:

1
1
1
1
1
1
1
1
1

Material

Width
(mm)

Height
(mm)

t.design
(mm)

A 516 GR. 65N


A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N
A 516 GR. 65N

2,440
2,440
2,440
2,440
2,440
2,440
2,020
2,020
2,020

20,700
18,260
15,820
13,380
10,940
8,500
6,060
4,040
2,020

27.30
24.40
21.49
18.58
15.67
12.77
9.86
7.45
5.04

t.hydro.
(mm)

t.min
(mm)

tsc.
(mm)

Result

21.60
19.02
16.43
13.85
11.26
8.68
6.10
3.96
1.82

27.30
24.40
21.49
18.58
15.67
12.77
11.00
11.00
11.00

28.00
25.00
22.00
19.00
16.00
13.00
11.00
11.00
11.00

O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.
O.K.

2 .6

MAXIMUM ALLOWABLE STRESS

No.

Height
(mm)

t.min
(mm)

tsc.
(mm)

H'
(mm)

H' max
(mm)

H
(mm)

P'max
N/m

Pmax
N/m

1
2
3
4
5
6
7
8
9

20,700
18,260
15,820
13,380
10,940
8,500
6,060
4,040
2,020

27.30
24.40
21.49
18.58
15.67
12.77
11.00
11.00
11.00

28.00
25.00
22.00
19.00
16.00
13.00
11.00
11.00
11.00

20,700
18,260
15,820
13,380
10,940
8,500
6,060
4,040
2,020

21,306.77
18,786.53
16,266.30
13,746.06
11,225.82
8,705.59
7,025.43
7,025.43
7,025.43

606.77
526.53
446.30
366.06
285.82
205.59
965.43
2985.43
5005.43

5,952.41
5,165.29
4,378.18
3,591.06
2,803.94
2,016.82
9,470.87
29,287.07
49,103.27

5,952.41
5,165.29
4,378.18
3,591.06
2,803.94
2,016.82
2,016.82
9,470.87
29,287.07

H' =
H' max =
P'max =
Pmax =

Effective liquid head at design pressure


Max. liquid head for tsc.
Max. allowable stress for tsc.
Max. allowable stress at shell course.

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