Page 460 - 2018_IFC

FLAMMABLE AND COMBUSTIBLE LIQUIDS

2. Stationary tanks located outside of build- of districts in which such storage is prohibited
ings where protected by an approved [JURISDICTION TO SPECIFY].
water-spray system designed in accordance 5704.2.9.6.1.1 Location of tanks with pressures
with Chapter 9 and NFPA 15.
2.5 psig or less. Above-ground tanks operating at
3. Stationary tanks located inside of buildings pressures not exceeding 2.5 psig (17.2 kPa) for
equipped throughout with an approved storage of Class I, II or IIIA liquids, which are
automatic sprinkler system designed in designed with a floating roof, a weak roof-to-
accordance with Section 903.3.1.1. shell seam or equipped with emergency venting
devices limiting pressure to 2.5 psig (17.2 kPa),
5704.2.9.2.4 Inerting of tanks storing boilover liq-
shall be located in accordance with Table
uids. Liquids with boilover characteristics shall not
be stored in fixed roof tanks larger than 150 feet (45 22.4.1.1(a) of NFPA 30.
720 mm) in diameter unless an approved gas enrich- Exceptions:
ment or inerting system is provided on the tank.
1. Vertical tanks having a weak roof-to-
Exception: Crude oil storage tanks in production
shell seam and storing Class IIIA liquids
fields with no other exposures adjacent to the are allowed to be located at one-half the
storage tank.
distances specified in Table 22.4.1.1(a)
5704.2.9.3 Supports, foundations and anchorage. of NFPA 30, provided that the tanks are
Supports, foundations and anchorages for above- not within a diked area or drainage path
ground tanks shall be designed and constructed in for a tank storing Class I or II liquids.
accordance with NFPA 30 and the International Build-
ing Code. 2. Liquids with boilover characteristics and
unstable liquids in accordance with Sec-
5704.2.9.4 Stairways, platforms and walkways. tions 5704.2.9.6.1.3 and 5704.2.9.6.1.4.
Stairways, platforms and walkways shall be of non-
combustible construction and shall be designed and 3. For protected above-ground tanks in
constructed in accordance with NFPA 30 and the Inter- accordance with Section 5704.2.9.7 and
national Building Code. tanks in at-grade or above-grade vaults
in accordance with Section 5704.2.8, the
5704.2.9.5 Above-ground tanks inside of buildings. distances in Table 22.4.1.1(b) of NFPA
Above-ground tanks inside of buildings shall comply 30 shall apply and shall be reduced by
with Sections 5704.2.9.5.1 and 5704.2.9.5.2. one-half, but not to less than 5 feet
5704.2.9.5.1 Overfill prevention. Above-ground (1524 mm).
tanks storing Class I, II and IIIA liquids inside build- 5704.2.9.6.1.2 Location of tanks with pressures
ings shall be equipped with a device or other means exceeding 2.5 psig. Above-ground tanks for the
to prevent overflow into the building including, but storage of Class I, II or IIIA liquids operating at
not limited to: a float valve; a preset meter on the fill pressures exceeding 2.5 psig (17.2 kPa) or
line; a valve actuated by the weight of the tank’s equipped with emergency venting allowing pres-
contents; a low-head pump that is incapable of pro- sures to exceed 2.5 psig (17.2 kPa) shall be
ducing overflow; or a liquid-tight overflow pipe not located in accordance with Table 22.4.1.3 of
less than one pipe size larger than the fill pipe and NFPA 30.
discharging by gravity back to the outside source of
liquid or to an approved location. Tanks containing Exception: Liquids with boilover characteris-
Class IIIB liquids and connected to fuel-burning tics and unstable liquids in accordance with
equipment shall be provided with a means to prevent Sections 5704.2.9.6.1.4 and 5704.2.9.6.1.5.
overflow into buildings in accordance with Section
5704.2.7.5.8. 5704.2.9.6.1.3 Location of tanks storing boi-
lover liquids. Above-ground tanks for storage of
5704.2.9.5.2 Fill pipe connections. Fill pipe con- liquids with boilover characteristics shall be
nections for tanks storing Class I, II and IIIA liquids located in accordance with Table 22.4.1.4 of
and Class IIIB liquids connected to fuel-burning NFPA 30.
equipment shall be in accordance with Section
5704.2.9.7.6. 5704.2.9.6.1.4 Location of tanks storing unsta-
ble liquids. Above-ground tanks for the storage
5704.2.9.6 Above-ground tanks outside of buildings. of unstable liquids shall be located in accordance
Above-ground tanks outside of buildings shall comply with Table 22.4.1.5 of NFPA 30.
with Sections 5704.2.9.6.1 through 5704.2.9.6.3.
5704.2.9.6.1.5 Location of tanks storing Class
5704.2.9.6.1 Locations where above-ground tanks IIIB liquids. Above-ground tanks for the stor-
are prohibited. Storage of Class I and II liquids in age of Class IIIB liquids, excluding unstable liq-
above-ground tanks outside of buildings is prohib- uids, shall be located in accordance with Table
ited within the limits established by law as the limits 22.4.1.6 of NFPA 30, except where located

2018 INTERNATIONAL FIRE CODE ® 427
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