api650-2010

WELDED STEEL T ANKS FOR OIL STORAGE F-3 Figure F-2—Permissible Details of Compression Rings 2t c max t a L e L e L e L e w c min Alternative (inside or outside) Alternative R c t c R c R c t c t c t a t a R 2 q t h Detail a w c t a L e L e L e t a t a Detail b A w h B<A B<A B 2t c max A B w h Neutral axis of angle Neutral axis of angle w c Detail c Detail h Detail i Detail k w h 2t c max t b w c t a = thickness of angle leg t b = thickness of bar t c = thickness of shell plate t h = thickness of roof plate t s = thickness of thickened plate in shell w c = maximum width of participating shell = 0.6 (Rc t) 0.5 , where t = tc or ts as applicable. w h = maximum width of participating roof = 0.3(R2 th) 0.5 or 300 mm (12 in.) whichever is less. R c = inside radius of tank shell R 2 = length of the normal to the roof, measured from the vertical centerline of the tank = Rc / (sin ) t c R c t c R c R c t h 0.6(R 2 t b ) 0.5 w c t b or a maximum of 0.9(R c t b ) 0.5 0.6(R c t s ) 0.5 t b t h 0.5 w h t c 2t s or 2t b max 2t c max w c min w h w c t c Detail f t s w c w h A B B<A B<A t c R c R c R c R c Neutral axis of angle Neutral axis of angle w c min w h Detail d w c A B t c t a t a w c min w h Detail e w c w h 2t c max 2t c max 16t a max w c w c min t c Detail g L e L e max max max max L e 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, L e , shall be limited to 250/(F y ) 1/2 mm [3000/(F y ) 1/2 in.] multiplied times t a for details a through g or times t b for details h through k, where F y 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 MST No reproduction or networking permitted without license from IHS --`,`,,``,,```,```,,,``,`,`,`,`-`-`,,`,,`,`,,`---

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WELDED STEEL TANKS FOR OIL STORAGE F-3

Figure F-2—Permissible Details of Compression Rings

2tc max

ta Le

Le Le

wc min

Alternative(inside or outside)

Alternative

Rctc

RcRc

tctc

qth

Detail a

LeLe

ta ta

Detail b

Awh

B<A B<A

2tc max

Neutral axisof angle

Neutral axisof angle wc

Detail c

Detail h Detail i Detail k

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

0.6(R2tb)0.5

or a maximum

of 0.9(Rctb)0.5

0.6(Rcts)0.5

0.5

2ts or 2tb max

2tc max

wc min

Detail f

B<AB<A

Neutralaxis ofangle

wc min

Detail d

tawc min

Detail e

2tc max2tc max

16tamax

wc min

Detail g

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).

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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