Crude Oil Tank Arrangement and Protection (AST)
Crude Oil Tank Arrangement and Protection (AST)
(OP)
I am currently trying to squeeze 6 million barrels of various Class flammable/combustibles onto an existing undeveloped rural site. I see in the NFPA 30 that for floating roof tanks whose diameter is larger than 150ft, and that contain Class IIIa liquids, then the spacing must be 1/4 X (sum of 2 adjacent tanks). However, going by the codicil concerning partial remote impoundment, it appears that I can reduce this spacing to 1/6 X (sum of 2 adjacent tank diameters). My question is, is there anything else int he NFPA that would allow me to reduce this shell to shell spacing even further? I read something in an old thread that perhaps some type of cooling sprinklers would allow the tanks to be closer together? But I can't seem to confirm that in NFPA 15 or 30. I would appreciate any comments that anyone has on the subject . . . thread184-121239: Genset Belly Tank installation





RE: Crude Oil Tank Arrangement and Protection (AST)
I've also found problems with a group of tanks within the same dike of different flammable & combustible liquid classifications.
My first question is: if the site is undeveloped, what's limiting your tank spacing? I am assuimg its site dimensions.
RE: Crude Oil Tank Arrangement and Protection (AST)
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RE: Crude Oil Tank Arrangement and Protection (AST)
RE: Crude Oil Tank Arrangement and Protection (AST)
4.3.2.2 and table 4.3.2.2.1
how about 4.3.2.3.3 (# 6) and 4.3.2.3.2 (F,3)
RE: Crude Oil Tank Arrangement and Protection (AST)
" thread184-121239: Genset Belly Tank installation: Genset Belly Tank installation " refers to baby tanks
both tanks are greater than 660 gal and less than 3,000 gal
RE: Crude Oil Tank Arrangement and Protection (AST)
RE: Crude Oil Tank Arrangement and Protection (AST)
RE: Crude Oil Tank Arrangement and Protection (AST)
Oh, I think I remember now. The reductions are for emergency vent flow rates rather than tank spacing
RE: Crude Oil Tank Arrangement and Protection (AST)
RE: Crude Oil Tank Arrangement and Protection (AST)
The only exception I can find in the 2003 edition of NFPA 30, is exception 1 in Section 4.3.2.2.1. However, given the stated tank diameters, the exception would not be applicable given the volume of liquid that would be stored.
In such a case you would need to perform an alternative means and method to further reduce your spacing or comply with the 1/6 the sum of the adjacent tank diameters.