Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 218 - ORGANIC MATERIAL EMISSION STANDARDS AND LIMITATIONS FOR THE CHICAGO AREA
Subpart B - ORGANIC EMISSIONS FROM STORAGE AND LOADING OPERATIONS
Section 218.120 - Control Requirements for Storage Containers of VOL
Universal Citation: 35 IL Admin Code ยง 218.120
Current through Register Vol. 48, No. 38, September 20, 2024
a) Every owner or operator storing VOL in a vessel of 40,000 gallons or greater with a maximum true vapor pressure equal to 0.75 psia but less than 11.1 psia shall reduce VOM emissions from storage tanks, reservoirs, or other containers as follows:
1) Each fixed roof tank shall be equipped
with an internal floating roof that meets the following specifications or that
is equipped with a vapor control system that meets the specifications contained
in subsection (a)(4) below:
A) The internal
floating roof shall rest or float on the liquid surface (but not necessarily in
complete contact with it) inside a storage vessel that has a fixed roof. The
internal floating roof shall be floating on the liquid surface at all times,
except during initial fill and during those intervals when the storage vessel
is completely emptied and subsequently refilled. When the roof is resting on
the leg supports, the process of filling, emptying, or refilling shall be
continuous and shall be accomplished as rapidly as possible.
B) Each internal floating roof shall be
equipped with one of the following closure devices between the wall of the
storage vessel and the edge of the internal floating roof:
i) A foam- or liquid-filled seal mounted in
contact with the liquid (liquid-mounted seal). A liquid-mounted seal means a
foam- or liquid-filled seal mounted in contact with the liquid between the wall
of the storage vessel and the floating roof continuously around the
circumference of the tank;
ii) Two
seals mounted one above the other so that each forms a continuous closure that
completely covers the space between the wall of the storage vessel and the edge
of the internal floating roof. The lower seal may be vapor-mounted, but both
must be continuous; or
iii) A
mechanical shoe seal, which is a metal sheet held vertically against the wall
of the storage vessel by springs or weighted levers and is connected by braces
to the floating roof. A flexible coated fabric (envelope) spans the annular
space between the metal sheet and the floating roof.
C) Each opening in a noncontact internal
floating roof except for automatic bleeder vents (vacuum breaker vents) and the
rim space vents is to provide a projection below the liquid surface.
D) Each opening in the internal floating roof
except for leg sleeves, automatic bleeder vents, rim space vents, column wells,
ladder wells, sample wells, and stub drains is to be equipped with a cover or
lid which is to be maintained in a closed position at all times (i.e., no
visible gap) except when the device is in actual use. The cover or lid shall be
equipped with a gasket. Covers on each access hatch and automatic gauge float
well shall be bolted except when they are in use.
E) Automatic bleeder vents shall be equipped
with a gasket and are to be closed at all times when the roof is floating
except when the roof is being floated off or is being landed on the roof leg
supports.
F) Rim space vents shall
be equipped with a gasket and are to be set to open only when the internal
floating roof is not floating or at the manufacturer's recommended
setting.
G) Each penetration of the
internal floating roof for the purpose of sampling shall be a sample well. The
sample well shall have a slit fabric cover that covers at least 90 percent of
the opening.
H) Each penetration of
the internal floating roof that allows for passage of a ladder shall have a
gasketed sliding cover.
2) During the next scheduled tank cleaning or
before March 15, 2004, whichever comes first, each internal floating roof tank
shall meet the specifications set forth in subsections (a)(1)(A) through (H)
above.
3) Each external floating
roof tank shall meet the following specifications:
A) Each external floating roof shall be
equipped with a closure device between the wall of the storage vessel and the
roof edge. The closure device is to consist of two seals, one above the other.
The lower seal is referred to as the primary seal, and the upper seal is
referred to as the secondary seal.
i) Except
as provided in Section
218.127(b)(4)
of this Subpart, the primary seal shall completely cover the annular space
between the edge of the floating roof and tank wall and shall be either a
liquid mounted seal or a shoe seal.
ii) The secondary seal shall completely cover
the annular space between the external floating roof and the wall of the
storage vessel in a continuous fashion except as allowed in Section
218.127(b)(4)
of this Subpart.
iii) The tank
shall be equipped with the closure device after the next scheduled tank
cleaning, but no later than March 15, 2004.
B) Except for automatic bleeder vents and rim
space vents, each opening in a noncontact external floating roof shall provide
a projection below the liquid surface. Except for automatic bleeder vents, rim
space vents, roof drains, and leg sleeves, each opening in the roof is to be
equipped with a gasketed cover, seal, or lid that is to be maintained in a
closed position at all times (i.e., no visible gap) except when the device is
in actual use. Automatic bleeder vents are to be closed at all times when the
roof is floating except when the roof is being floated off or is being landed
on the roof leg supports. Rim vents are to be set to open when the roof is
being floated off the roof leg supports or at the manufacturer's recommended
setting. Automatic bleeder vents and rim space vents are to be gasketed. Each
emergency roof drain is to be provided with a slotted membrane fabric cover
that covers at least 90 percent of the area of the opening.
C) The roof shall be floating on the liquid
at all times (i.e., off the roof leg supports) except when the tank is
completely emptied and subsequently refilled. The process of filling, emptying,
or refilling when the roof is resting on the leg supports shall be continuous
and shall be accomplished as rapidly as possible.
4) A closed vent system and control device
respectively shall meet the following specifications:
A) The closed vent system shall be designed
to collect all VOM vapors and gases discharged from the storage vessel and
operated with no detectable emissions as indicated by an instrument reading of
less than 500 ppm above background and visual inspections, as determined by the
methods specified in
40 CFR
60.485(c), incorporated by
reference at Section
218.112(d)
of this Part.
B) The control device
shall be designed and operated to reduce inlet VOM emissions by 95 percent or
greater. If a flare is used as the control device, it shall meet the
specifications described in the general control device requirements of
40 CFR
60.18, incorporated by reference at Section
218.112(d)
of this Part.
5) An
alternative emission control plan equivalent to the requirements of subsection
(a)(1), (a)(2), (a)(3), or (a)(4) above that has been approved by the Agency
and the USEPA in a federally enforceable permit or as a SIP revision.
b) The owner or operator of each storage vessel with a design capacity equal to or greater than 40,000 gallons which contains VOL that, as stored, has a maximum true vapor pressure greater than or equal to 11.1 psia shall equip each storage vessel with a closed vent system and control device as specified in subsection (a)(4) above.
c) Notwithstanding subsection (b) of this Section, where an owner or operator can demonstrate that the control device installed on a storage vessel on or before December 31, 1992, was designed to reduce inlet VOM emissions by greater than or equal to 90 percent but less than 95 percent, the control device shall be operated to reduce inlet VOM emission by 90 percent or greater.
Disclaimer: These regulations may not be the most recent version. Illinois may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
