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Freeboard Requirement per Add. 4

Freeboard Requirement per Add. 4

Freeboard Requirement per Add. 4

(OP)
Hi,

I'm currently designing an API 650 tank that has been assigned to SUG I.  Per Table E-7, the minimum required freeboard is 0.7d if SDS < 0.5g.  What happens if SDS >= 0.5g?  The table does not specify what to use if SDS >= 0.5g.  Should the freeboard be equal to the wave height should this be the case?  Also, the statement in E.7.2, “The purchaser shall specify whether freeboard is desired for SUG I tanks” does add confusion to the situation.  The title of Table E-7 is “Minimum Required Freeboard.”  Could someone shed some light this direction?  

Jorge, Jr.
Alonso & Carus Iron Works, Inc.
Euro-American Steel Co., Inc.

RE: Freeboard Requirement per Add. 4

Refer to the similar, but more complete, Table 15.7-3 in ASCE 7-05.

For SUG I, it still shows "no minimum freeboard is required" for SDS>0.5g.  

RE: Freeboard Requirement per Add. 4

(OP)
Thanks JStephen.  I checked teh ASCE 7-05 and you are correct.  

Jorge, Jr.

Jorge L. Ramos, Jr., MSCE, PE
Alonso & Carus Iron Works, Inc. (www.alonsocarus.com)
Euro-American Steel Co., Inc. (www.euroamericansteel.com)

RE: Freeboard Requirement per Add. 4

(OP)
I wonder why API 650 App. 4 did not include the same table as in ASCE 7-05.  Why have they chosen to left out the condition for SDS >= 0.5g?  Does anyone know?  

Jorge L. Ramos, Jr., MSCE, PE
Alonso & Carus Iron Works, Inc. (www.alonsocarus.com)
Euro-American Steel Co., Inc. (www.euroamericansteel.com)

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