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NFPA
30A 2000 Edition
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BOCA
1999 Edition |
Approval/General
Provisions
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The
use of aboveground storage tanks
at motor fuel dispensing facilities,
fleet vehicle motor fuel dispensing
facilities, and marine motor fuel
dispensing facilities shall be permitted
when installed in accordance with
the requirements of Section 4.3
and with all applicable requirements
of Chapters 2 and 3 of NFPA 30,
and when the specific installation
has been approved by the AHJ.
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Aboveground
tanks utilized for the storage of
motor fuels at automotive service
stations to which the public does
not have access shall be installed
in accordance with the requirements
for fire resistant tanks or tanks
in vaults specified in NFPA 30A.
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Terminology
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Fire
Resistant Tank. The listed construction
that provides the required fire-resistive
protection, prevents release of
liquid, failure of primary tank,
failure of the supporting structure,
and impairment of venting for not
less than 2 hours when tested using
a fire exposure that stimulates
a high-intensity pool fire, such
as UL 2080 or equivalent. Protected
Aboveground Tank. The listed construction
that provides the required fire-resistive
protection, prevents the release
of liquid, failure of the primary
tank, failure of the supporting
structure, and impairment of venting
for not less than 2 hours, and shall
limit the increase in temperature
of liquid inside the tank when tested
using the fire exposure specified
in UL 2085. Vault. The vault must
be liquid tight and designed to
withsand loading from soil, water,
traffic, etc. Vaults shall be provided
with approved vapor & liquid
detection systems, including on-site
audible & visual warning devices
with battery backup. Vaults with
Class I liquids require exhaust
ventilation.
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Fire
Resistank Tank (Tanks in Vaults)
References NFPA 30A
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Installation
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See
Approval, General Provisions. NFPA
30 provides additional requirements
on aboveground tank systems for
control of spillage, normal and
emergency venting, corrosion control,
tank construction, supports and
foundation, flooding exposure, and
testing and maintenance.
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All
fuel-dispensing systems shall be
installed in accordance with mechanical
code and NFPA 30 or 30A.
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Maximum
Capacities
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Tanks
storing Class I and Class II liquids
at an individual site: 12,000 gal
individual and 40,000 gal aggregate
Tanks storing Class II and Class
III liquids at fleet vehicle motor
fuel dispensing facilities: 20,000
gallon individual and 80,000 gallon
aggregate Individual tanks in vaults
may store up to 15,000 gallons.
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6,000
gal individual/private 18,000 gal
aggregate
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Overfill/Spill
Prevention
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Overfill
- alarm at 90% capacity. Automatic
shut-off at 98% or restricted flow
at 95% capacity. Means to determine
liquid level shall be accessible
to delivery operator.
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Tanks
shall be provided with automatic
fuel shutoff devices capable of
stopping the delivery of fuel into
the storage tank at a 90% tank capacity.
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Physical
Protection
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6'
high security fence located at least
10' from tank and a gate properly
secured against unauthorized entry.
When required, provide protection
against vehicular collision by suitable
barriers, such as 4" diameter
steel pipe filled with concrete
set 3' deep in a concrete footing
and spaced no more than 4' apart.
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Tanks
shall be surrounded by a clear open
space not less than 3' in width
for maintenance and inspection.
Physical barriers around tank area
shall be a minimum of 30" in
height & resist a force of 12,000
lbs.
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Tank
Filling Operations
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Separation
of delivery vehicle by 25' for Class
I and 15" for Class II or Class
III liquids. No minimum separation
required for tanks that are filled
by gravity. Liquid tight connections
required. Delivery must meet applicable
requirements of NFPA 385.
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No
minimum separation distance of delivery
vehicles from tanks specified. Motor
fuels shall be transferred from
tanks by means of fixed pumps so
designed and equipped to allow control
of the lfow and prevent leakage
or accidental discharge.
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Secondary
Containment
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Secondary
Containment tanks may be used to
provide spill, control in addition
to diking or remote impondingn.
Section 2-3.23 of NFPA 30 limits
such tanks to 12,000 gallons or
less. Means shall be provided to
prevent release of liquid by siphon
flow, and with all openings at the
top of the tank. Means to determine
the level of liequid during deliveries,
and to meet spill prevention requirements
are noted herin. Enclosed secondary
containment shall be provided with
emergency vents. The interstitial
space shall be tested with air pressure
or vacuum to addure integrity
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Separation
Distances
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Piping
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Openings
in tank top only Provide means to
prevent release of liquid by syphon
flow. Elevated tanks producing a
gravity head on dispeser shall be
equipped with device at tank outlet
to prevent gravity flow, such as
a solenoid valve. Shut-off and check
valves require pressure relief devices
generated by thermal expansion.
Pipe shall be protected from physical
damage. Provide listed shut-off
shear valve under dispenser. With
remote pressure pump systems, pump
shall have a listed leak detection
device.
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Openings
at tank top only Anti-siphon devices
required at each piping connection
to a tank where such tank piping
extends below the level of the top
of such tank
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Misc.
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Requirements
for fuel dispensing devices, electrical
equipment, vapor recovery processing
systems, and operational requirements.
Testing provisions for secondary
containment are given. Listed automatic-close
nozzles required. Accurate inventory
control records shall be maintained
and reconciled.
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Controls:
Dispensers shall be designed to
prevent leakage or accidental discharge
and shall be provided with remote
master control devices to shut off
all pumps in the event of an emergency.
Emergency shut-off valve: An approved
emergency shut-off valve designed
to close automatically in the event
of a fire or impact shall be properly
installed in the liquid supply line
at the base of each dispenser supplied
by a remote pump. Where installed,
a vapor return line located inside
the dispenser housing shall have
a shear section or approved flexible
connector for the liquid supply
line emergency shutt-off valve to
function |
