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Subchapter 7. General Industry Safety Orders
Group 20. Flammable Liquids, Gases and Vapors
Article 145. Tank Storage

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§5589. Installation of Outside Aboveground Tanks.

(a) Every aboveground tank for the storage of Category 1, 2, 3 or 4 flammable liquids, except those liquids with boil-over characteristics and unstable liquids, operating at pressures not in excess of 2.5 psig and designed with a weak roof-to-shell seam or equipped with emergency venting devices which will not permit pressures to exceed 2.5 psig, shall be located in accordance with Table FL-10.
(1) For the purpose of this Section, a floating roof tank is one which incorporates a pontoon or double deck roof in an open top tank in accordance with API Standard 650, or one which incorporates an internal all-metal (except for seals) floating cover with a fixed metal roof with adequate ventilation at the eaves of the roof. Tanks with internal floating covers incorporating nonmetallic construction, such as plastics, shall be treated as cone roof tanks.
(b) Every aboveground tank for the storage of Category 1, 2, 3 or 4 flammable liquids, except those liquids with boil-over characteristics and unstable flammable or combustible liquids, operating at pressures exceeding 2.5 psig or equipped with emergency venting which will permit pressures to exceed 2.5 psig shall be located in accordance with Table FL-11.
(c) Every aboveground tank for the storage of Category 1, 2, 3 or 4 flammable liquids with boil-over characteristics shall be located in accordance with Table FL-12.
(d) Every aboveground tank for the storage of unstable liquids shall be located in accordance with Table FL-13.
(e) Every aboveground tank for the storage of liquids with a flashpoint greater than 199.4oF (93oC) (formerly designated Class IIIB Combustible liquids), excluding unstable liquids, shall be located in accordance with Table FL-14 except when located within a diked area or drainage path for a tank or tanks storing a Category 1, 2 or 3 flammable liquid. When a combustible liquid (formerly designated Class IIIB liquid) storage tank is within the diked area or drainage path for a Category 1, 2 or 3 flammable liquid, (a) or (b) shall apply.
(f) Reference minimum distances for use in Tables FL-10 to FL-13, inclusive.
(g) Where end failure of horizontal pressure tanks and vessels may expose property, the tank shall be placed with the longitudinal axis parallel to the nearest important building.
Image 1 within § 5589. Installation of Outside Aboveground Tanks.
Image 2 within § 5589. Installation of Outside Aboveground Tanks.
Image 3 within § 5589. Installation of Outside Aboveground Tanks.
Image 4 within § 5589. Installation of Outside Aboveground Tanks.
Image 5 within § 5589. Installation of Outside Aboveground Tanks.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
HISTORY
1. Amendment of subsection (e) and Table FL-11 filed 12-19-78; effective thirtieth day thereafter (Register 79, No. 1).
2. Amendment of subsections (a), (b) and (e) and amendment of Note filed 5-5-2014; operative 5-6-2014 pursuant to Government Code section 11343.4(b)(3) (Register 2014, No. 19).


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