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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.
(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.
(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.

(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.

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. 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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