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Subchapter 7. General Industry Safety Orders
Group 20. Flammable Liquids, Gases and Vapors
Article 143. Processing Plants

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§5555. Location.

(a) The location of each processing vessel shall be based upon its flammable or combustible liquid capacity. Processing vessels shall be located, with respect to distances to lines of adjoining property which may be built upon, in accordance with Table FL-8, except when the processing plant is designed in accordance with (b).

                             Table FL-8 
Processing Vessels With 
  Emergency Relief Venting 
  to Permit Pressure         Stable Liquids    Unstable Liquids 
Not in excess of 2.5 psig..... Table FL-15*    2 1/2 times 
                                               Table FL-15* 
Over 2.5 psig................. 1 1/2 times     4 times 
                               Table FL-15*    Table FL-15 * 

* Double distances where protection of exposure is not provided.

(b) The distances required in (a) may be waived when the vessels are housed within a building and the exterior wall facing the line of adjoining property which may be built upon is a blank wall having a fire resistance rating of not less than four hours. When Class IA or unstable liquids are handled, the blank wall shall have explosion resistance in accordance with good engineering practice, see Section 5556(f). (Title 24, T8-5555)


1. Amendment filed 7-16-76; effective thirtieth day thereafter (Register 76, No. 29).

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