Go Back to Article 145 Table of Contents
| New query |
(a) Every aboveground tank for the storage of Class I, Class II or Class IIIA 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 Class I, Class II or Class IIIA 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 Class I, Class II or Class IIIA 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 Class IIIB 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 Class I or Class II liquid. When a Class IIIB liquid storage tank is within the diked area or drainage path for a Class I or Class II 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.
Table FL-10
| Type of Tank |
Protection | Minimum Distance in Feet From Property Line Which May Be Built Upon, Including the Opposite Side of a Public Way ans Shall Be Not Less Than Five (5) Feet |
Minimum Distance in Feet From Nearest Side of Any Public Way or From Nearest Important Building and Shall Be Not Less Than Five (5) Feet |
| Floating Roof |
Protection for Exposures |
1/2 times diameter of tank but need not exceed 90 feet |
1/6 times diameter of tank but need not exceed 30 feet |
| None | Diameter of tank but need not exceed 175 feet |
1/6 times the diameter of the tank but need not exceed 30 feet | |
| Vertical with Weak Roof to Shell Seam |
Approved foam or inerting system on the tank |
1/2 times diameter of tank but need not exceed 90 feet |
1/6 times diameter of tank but need not exceed 30 feet |
| Protection for Exposures |
Diameter of tank but need not exceed 175 feet |
1/3times the diameter of the tank but need not exceed 60 feet |
|
| None | 2 times diameter of tank but need not exceed 350 feet |
1/3times the diameter of the tank but need not exceed 60 feet |
|
| Horizontal and Vertical, with Emer- gency Relief Venting to Limit Pressures to 2.5 psig |
Approved inerting system on the tank or approved foam system on vertical tanks |
1/2 times Table FL-15 | 1/2 times Table FL-15 |
| Protection for Exposures | Table FL-15 | Table FL-15 | |
| None | 2 times Table FL-15 | 2 times Table FL-15 |
Table FL-11
| Type of Tank |
Protection | Minimum Distance in Feet From Property Line Which May Be Built Upon, Including the Opposite Side of a PublicWay |
Minimum Disatnce in Feet From Nearest Side of Any Public Way or From Nearest Important Building |
| Any Type | Protection for Exposures
|
1 1/2 times table FL-15 but shall not be less than 25 feet |
1 1/2 times table FL-15 but shall not be less than 25 feet |
| None | 3 times table FL-15 but shall not be less than 50 feet |
1 1/2 times table FL-15 but shall not be less than 25 feet |
Table FL-12
| Type of Tank |
Protection | Minimum Distance in Feet From Property Line Which May Be Built Upon, Including the Opposite Side of a Public Way |
Minimum Distance in Feet From Nearest Side of Any Public Way or From Nearest Important Building |
| Floating Roof |
Protection for Exposures |
1/2 times diameter of tank but need not exceed 90 feet |
1/6 times diameter of tank but need not exceed 30 feet |
| None | Diameter of tank but need not exceed 175 feet |
1/6times diameter of tank but need not exceed 30 feet |
|
| Fixed Roof |
Approved foam or inerting system |
Diameter of tank but need not exceed 175 feet |
1/3 times diameter of tank but need not exceed 60 feet |
| Protection for Exposures |
2 times diameter of tank but need not exceed 350 feet |
2/3 times diameter of tank but need not exceed 120 feet |
|
| None | 4 times diameter of tank but need not exceed 350 feet |
2/3 times diameter of tank but need not exceed 120 feet |
Table FL-13
| Type of Tank |
Protection | Minimum Distance in Feet From Property Line Which May Be Built Upon, Including the Opposite Side of a Public Way |
Minimum Distance in Feet From Nearest Side of Any Public Way or From Nearest Important Building |
| Horizontal and Verticle Tanks With Emergency Relief Venting to Permit Pressure Not in Excess of 2.5 psig |
Tank protected with any one of the following: Approved water spray, Approved inerting, Approved insulation and refrigeration, Approved barricade |
Table FL-15 but not less than 25 feet |
Not less than 25 feet |
| Protection for Exposure |
2 1/2 times table FL-15 but not less than 50 feet |
Not less than 50 feet | |
| None | 5 times table FL-15 but not less than 100 feet |
Not less than 100 feet | |
| Horizontal and Verticle Tanks With Emergency Relief Venting to Permit Pressure |
Tank protected with any one of the following: Approved water spray, Approved inerting, Approved insulation and refrigeration, Approved barricade |
2 times table FL-15 but not less than 50 feet |
Not less than 50 feet |
| Protection for Exposure |
4 times table FL-15 but not less than 100 feet |
Not less than 100 feet | |
| None | 8 times table FL-15 but not less than 150 feet |
Not less than 150 feet |
Table FL-14
Capacity Gallons |
Minimum Distance in Feet From Property Line Which May Be Built Upon, Including the Opposite Side of a Public Way |
Minimum Distance in Feet From Nearest Side of Any Public Way or From Nearest Important Building |
| 12,000 or less | 5 | 5 |
| 12,001to 30,000 | 10 | 5 |
| 30,001 to 50,000 | 10 | 10 |
| 50,001 to 100,000 | 15 | 10 |
| 100,001 or more | 15 | 15 |
Table FL-15
CapacityTank Gallons |
Minimum Distance in Feet From Property Line Which May Be Built Upon, Including the Opposite Side of a Public Way |
Minimum Distance in Feet From Nearest Side of Any Public Way or From Nearest Important Building |
| 275 or less | 5 | 5 |
| 276 to 750 | 10 | 5 |
| 751 to 12,000 | 15 | 5 |
| 12,001 to 30,000 | 20 | 5 |
| 30,001 to 50,000 | 30 | 10 |
| 50,001 to 100,000 | 50 | 15 |
| 100,001 to 500,000 | 80 | 25 |
| 500,000 to 1,000,000 | 100 | 35 |
| 1,000,001 to 2,000,000 | 135 | 45 |
| 2,000,001 to 3,000,000 | 165 | 55 |
| 3,000,001 or more | 175 | 60 |
NOTE: Authority cited: 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).
Go Back to Article 145 Table of Contents
| The above information is provided free of charge by the Department of Industrial Relations from its web site at www.dir.ca.gov. |