| (a) No person shall place, store, or hold crude oil
or condensate in any storage tank unless the tank is capable of maintaining
working pressure sufficient at all times to prevent any vapor or gas
loss to the atmosphere or is in compliance with the following controls.
(1) All openings in a fixed roof storage tank through
which vapors are not routed to a vapor recovery unit or other control
device specified in paragraph (2) of this subsection, must be equipped
with a closure device maintained according to the manufacturer's instructions
and operated according to this paragraph. If manufacturer instructions
are unavailable, industry standards consistent with good engineering
practice can be substituted.
(A) Each closure device must be closed at all times
except when normally actuated or required to be open for temporary
access or to relieve excess pressure or vacuum in accordance with
the manufacturer's design and consistent with good air pollution control
practices. Such opening, actuation, or use must be limited to minimize
vapor loss.
(B) Each closure device must be properly sealed to
minimize vapor loss and must form a continuous impermeable barrier
over the entire surface area of the liquid in the storage tank when
closed.
(C) Each closure device must either be latched closed
or, if designed to relieve pressure, set to automatically open at
a pressure that will ensure all vapors are routed to the vapor recovery
unit or other control device under normal operating conditions other
than gauging the tank or taking a sample through an open thief hatch.
(D) No closure device may be allowed to have a volatile
organic compound (VOC) leak for more than 15 calendar days after the
leak is found unless delay of repair is allowed. For the purposes
of this subparagraph, a leak is the exuding of process gasses from
a closed device detected by audio, visual, and olfactory means. If
parts are unavailable, repair may be delayed. Parts must be ordered
promptly, and the repair must be completed within five days of receipt
of required parts. Repair may be delayed until the next shutdown if
the repair of the component would require a shutdown that would create
more emissions than the repair would eliminate. Repair must be completed
by the end of the next shutdown.
(2) A control device used to comply with this subsection
must meet one of the following conditions at all times when VOC vapors
are routed to the device. The VOC vapors must be routed through a
closed vent system that must be designed and operated to route to
a control device, including to route to a process, all captured VOC
vapor . Multiple vents may be routed to the same control device. Control
devices and closed vent systems must comply with the requirements
of §115.178 of this title (relating to Monitoring and Inspection
Requirements) and §115.179 of this title (relating to Approved
Test Methods and Testing Requirements).
(A) A control device, other than a device specified
in subparagraphs (B) and (C) of this paragraph, to which VOC vapors
are routed, must maintain a control efficiency of at least 95% or
a VOC concentration of equal to or less than 275 parts per million
by volume (ppmv), as propane, on a wet basis corrected to 3% oxygen.
The 95% VOC control efficiency and 275 ppmv VOC concentration are
calculated from the gas stream at the control device outlet. For a
boiler or process heater used as the control device, the vent gas
stream must be introduced into the flame zone of the boiler or process
heater.
(B) A flare must be designed and operated in accordance
with 40 Code of Federal Regulations (CFR) §60.18(b) - (f) (as
amended through December 22, 2008 (73 FR 78209)). The flare must be
lit at all times when VOC vapors are routed to the flare.
(C) A vapor recovery unit must be designed to process
all vapor generated by the maximum liquid throughput of the storage
tank or the aggregate of storage tanks in a tank battery and must
transfer recovered vapors to a pipe or container that is vapor-tight,
as defined in §115.10 of this title (relating to Definitions).
(D) A control device, used to comply with subparagraph
(A) of this paragraph, must operate with no visible emissions, as
determined through a visible emissions test conducted according to
United States Environmental Protection Agency (EPA) Method 22, 40
CFR Part 60, Appendix A-7, Section 11 (as amended March 16, 2015 (83
FR 13751)), except for periods not to exceed a total of one minute
during any 15-minute observation period.
(3) Beginning on the appropriate compliance date in §115.183
of this title (relating to Compliance Schedules), any storage tank
that stores crude oil or condensate with a true vapor pressure of
greater than or equal to 11 pounds per square inch absolute (psia)
and a storage capacity of at least 40,000 gallons, and was required
to use a submerged fill pipe under Table 2 in §115.112(e)(1)
of this title (relating to Control Requirements), must continue to
use a submerged fill pipe.
(4) The following requirements apply to a bypass installed
on a closed vent system able to divert any portion of the flow from
entering a control device or routing to a process.
(A) A flow indicator must be installed, calibrated,
and maintained at the inlet of each bypass. The flow indicator must
take a reading at least once every 15 minutes and initiate an alarm
notifying operators to take prompt remedial action when bypass flows
are present.
(B) Each bypass valve must be secured in the non-diverting
position using a car-seal or a lock-and-key type configuration.
(b) Any storage tank with the potential to emit less
than 6.0 tons per year of VOC, and any storage tank with the potential
to emit at least 6.0 tons per year of VOC emissions but that demonstrates
uncontrolled actual VOC emissions are less than 4.0 tons per year,
is not required to be in compliance with the control requirements
in subsection (a) of this section unless the tank was required to
comply with a control requirement in §115.112(e) of this title
on or before December 31, 2022. The owner or operator shall continue
to comply with the control requirement that applied as of December
31, 2022 in the Table in §115.112(e) of this title. The calculation
of emissions demonstrating that actual VOC emissions are less than
4.0 tons per year for 12 consecutive months based on average monthly
throughput must be performed on a monthly basis.
Attached Graphic
(c) The owner or operator shall calculate VOC emissions
as follows.
(1) Uncontrolled VOC emissions for a fixed roof storage
tank must be estimated using the highest 12 consecutive months out
of the last five years of production data for the initial determination
in accordance with the appropriate compliance date in §115.183
of this title, and one of the following methods. However, if emissions
determined using direct measurements or other methods approved by
the executive director under subparagraph (A) or (B) of this paragraph
are higher than emissions estimated using the default factors or charts
in subparagraph (C) or (D) of this paragraph, the higher values must
be used.
(A) The owner or operator may make direct measurements
using the measuring instruments and methods specified in §115.179
of this title.
(B) The owner or operator may use other test methods
or computer simulations approved by the executive director.
(C) The owner or operator may use a factor of 33.3
pounds of VOC per barrel (42 gallons) of condensate produced or 1.6
pounds of VOC per barrel (42 gallons) of oil produced.
(D) For crude oil storage only, the owner or operator
may use the chart in Exhibit 2 of the EPA's Lessons
Learned from Natural Gas Star Partners: Installing Vapor Recovery
Units on Crude Oil Storage Tanks, October 2003, and assuming
that the hydrocarbon vapors have a molecular weight of 34 pounds per
pound mole and are 48% by weight VOC.
(2) The VOC potential to emit must be based on the
maximum average daily throughput determined for a 30-day period of
production prior to the appropriate compliance date listed in §115.183
of this title.
(d) For an external floating roof or internal floating
roof storage tank, the following requirements apply.
(1) All openings in an internal floating roof or external
floating roof must provide a projection below the liquid surface.
Automatic bleeder vents (vacuum breaker vents) and rim space vents
are not subject to this requirement.
(2) All openings in an internal floating roof or external
floating roof must be equipped with a deck cover. The deck cover must
be equipped with a gasket in good operating condition between the
cover and the deck. The deck cover must be closed (i.e., no gap of
more than 1/8 inch) at all times, except when the cover must be open
for access. Automatic bleeder vents (vacuum breaker vents), rim space
vents, leg sleeves, and roof drains are not subject to this requirement.
Cont'd... |
