WELDED STEEL TANKS FOR OIL STORAGE F-3

Figure F-2—Permissible Details of Compression Rings

2tc max

ta Le

Le Le

Le

wc min

Alternative(inside or outside)

Alternative

Rctc

RcRc

tctc

ta

ta

R2

qth

Detail a

wc

ta

LeLe

Le

ta ta

Detail b

Awh

B<A B<A

B

2tc max

AB

wh

Neutral axisof angle

Neutral axisof angle wc

Detail c

Detail h Detail i Detail k

wh

2tc max

tbwc

ta = thickness of angle legtb = thickness of bartc = thickness of shell plateth = thickness of roof platets = thickness of thickened plate in shellwc = maximum width of participating shell = 0.6 (Rc t)0.5, where t = tc or ts as applicable.

wh = maximum width of participating roof = 0.3(R2 th)0.5 or 300 mm (12 in.) whichever is less.Rc = inside radius of tank shellR2 = length of the normal to the roof, measured from the vertical centerline of the tank = Rc / (sin )

tcRc

tcRc

Rc

th

0.6(R2tb)0.5

wc

tb

or a maximum

of 0.9(Rctb)0.5

0.6(Rcts)0.5

tb

th

0.5

wh

tc

2ts or 2tb max

2tc max

wc min

wh

wc

tc

Detail f

ts

wc

wh

AB

B<AB<A

tc

Rc

Rc

Rc

Rc

Neutralaxis ofangle

Neutralaxis ofangle

wc min

wh

Detail d

wc

AB

tc

ta

tawc min

wh

Detail e

wc

wh

2tc max2tc max

16tamax

wc

wc min

tc

Detail g

Le

Le

max

max max max

Le max

Notes:1. All dimensions and thicknesses are in mm (in.).2. Dimension B in details b, c, d, and e is: 0 � B � A.3. The unstiffened length of the angle or bar, Le, shall be limited to 250/(Fy)1/2 mm [3000/(Fy)1/2 in.] multiplied times ta for details athrough g or times tb for details h through k, where Fy is the minimum specified yield strength, MPa (lbf/in.2).

08

Copyright American Petroleum Institute Provided by IHS under license with API Licensee=Larsen and Tourbo - Faridabad/5954522004

Not for Resale, 12/09/2009 02:07:35 MSTNo reproduction or networking permitted without license from IHS

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