Indiana Administrative Code
Title 326 - AIR POLLUTION CONTROL DIVISION
Article 8 - VOLATILE ORGANIC COMPOUND RULES
Rule 9 - Volatile Organic Liquid Storage Vessels
Section 9-4 - Standards
Universal Citation: 326 IN Admin Code 9-4
Current through March 20, 2024
Authority: IC 13-14-8; IC 13-17-3-4
Affected: IC 13-17
Sec. 4.
(a) The owner or operator of each vessel with a capacity greater than or equal to thirty-nine thousand (39,000) gallons, that stores VOL with a maximum true vapor pressure greater than or equal to seventy-five hundredths (0.75) pound per square inch absolute (psia) but less than eleven and one-tenth (11.1) psia shall complete the following:
(1) For each
vessel having a permanently affixed roof, install one (1) of the following:
(A) An internal floating roof meeting the
standards in subsection (c).
(B) A
closed vent system and control device meeting the standards in subsection
(d).
(C) An emissions control
system that has been approved by the department and U.S. EPA based on
equivalent emissions reductions to that obtained in clause (A).
(2) For each vessel having an
internal floating roof, install one (1) of the following:
(A) An internal floating roof meeting the
standards in subsection (c).
(B) A
closed vent system and control device meeting the standards in subsection
(d).
(C) An emissions control
system that has been approved by the department and U.S. EPA based on
equivalent emissions reductions to that obtained in clause (A).
(3) For each vessel having an
external floating roof, install one (1) of the following:
(A) An external floating roof meeting the
standards in subsection (e).
(B) A
closed vent system meeting the standards in subsection (d).
(C) An emissions control system that has been
approved by the department and U.S. EPA based on equivalent emissions
reductions to that obtained in clause (A).
(4) For each vessel subject to this
subsection, either:
(A) install emission
control equipment; or
(B) submit a
schedule for vessel cleaning and installation of the emission control
equipment.
(b) The owner or operator of each vessel with a capacity greater than or equal to thirty-nine thousand (39,000) gallons, that stores VOL with a maximum true vapor pressure greater than or equal to eleven and one-tenth (11.1) psia shall equip each vessel with a closed vent system with a control device meeting the standards of subsection (d).
(c) Standards applicable to each internal floating roof are as follows:
(1) The internal
floating roof must float on the liquid surface, but not necessarily in complete
contact with it, inside a vessel that has a permanently affixed roof.
(2) The internal floating roof must float on
the liquid surface at all times, except during initial fill and during those
intervals when the vessel is completely emptied or subsequently emptied and
refilled.
(3) When the roof is
resting on the leg supports, the process of filling, emptying, or refilling
must be continuous and shall be accomplished as rapidly as possible.
(4) Each internal floating roof must be
equipped with one (1) of the following closure devices between the wall of the
vessel and the edge of the internal floating roof:
(A) A foam or liquid-filled seal mounted in
contact with the liquid (liquid-mounted seal).
(B) Two (2) seals mounted one (1) above the
other so that each forms a continuous closure that completely covers the space
between the wall of the vessel and the edge of the internal floating roof. The
lower seal may be vapor-mounted, but both must be continuous.
(C) A mechanical shoe seal that consists of a
metal sheet held vertically against the wall of the vessel by springs or
weighted levers and that is connected by braces to the floating roof. A
flexible coated fabric, or envelope, must span the annular space between the
metal sheet and the floating roof.
(5) Each opening in a noncontact internal
floating roof except for automatic bleeder vents (vacuum breaker vents) and the
rim space vents must provide a projection below the liquid surface.
(6) Openings in the internal floating roof
must meet the following requirements:
(A) 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 must be equipped with a cover or lid that is maintained in a closed
position at all times, with no visible gap, except when the device is in actual
use.
(B) The cover or lid must be
equipped with a gasket.
(C) Covers
on each access hatch and automatic gauge float well must be bolted except when
they are in use.
(7)
Automatic bleeder vents must be:
(A) equipped
with a gasket; and
(B) closed at
all times when the roof is floating except when the roof is being:
(i) floated off; or
(ii) landed on the roof leg
supports.
(8)
Rim space vents must be:
(A) equipped with a
gasket; and
(B) set:
(i) to open when the internal floating roof
is not floating; or
(ii) at the
manufacturer's recommended setting.
(9) Each penetration of the internal floating
roof for the purpose of sampling must be through a sample well opening. The
sample well must have a slit fabric cover that covers at least ninety percent
(90%) of the opening.
(10) Each
penetration of the internal floating roof that allows for passage of a ladder
must have a gasketed sliding cover.
(d) Standards applicable to each closed vent system and control device are as follows:
(1)
The closed vent system must be:
(A) designed
to collect all VOC vapors and gases discharged from the vessel; and
(B) operated with no detectable emission as
indicated by:
(i) an instrument reading of
less than five hundred (500) parts per million (ppm) above background;
and
(ii) visual inspections as
determined by the methods specified in
40 CFR
60.485(c) *.
(2) The control device
must be designed and operated to reduce inlet VOC emissions by at least
ninety-five percent (95%). If a flare is used as the control device, it must
meet the specifications described in the general control device requirements in
40 CFR
60.18 *.
(e) Standards applicable to each external floating roof are as follows:
(1) Each
external floating roof must be equipped with a closure device between the wall
of the vessel and the roof edge consisting of two (2) seals, with one (1) above
the other, as follows:
(A) The lower seal is
the primary seal.
(B) The upper
seal is the secondary seal.
(2) Except as provided in section 5(c)(4) of
this rule, the primary seal must:
(A)
completely cover the annular space between the edge of the floating roof and
vessel wall; and
(B) be either a:
(i) liquid-mounted seal; or
(ii) shoe seal.
(3) Except as allowed in section
5(c)(4) of this rule, the secondary seal must completely cover the annular
space between the external floating roof and the wall of the vessel in a
continuous fashion.
(4) Except for
automatic bleeder vents and rim space vents, each opening in a noncontact
external floating roof must provide a projection below the liquid
surface.
(5) Except for automatic
bleeder vents, rim space vents, roof drains, and leg sleeves, each opening in
the roof must be equipped with a gasketed cover, seal, or lid that is
maintained in a closed position at all times, without visible gap, except when
the device is in actual use.
(6)
Automatic bleeder vents must be:
(A) equipped
with a gasket; and
(B) closed at
all times when the roof is floating except when the roof is being:
(i) floated off; or
(ii) landed on the roof leg
supports.
(7)
Rim vents must be:
(A) equipped with a gasket;
and
(B) set:
(i) to open when the roof is being floated
off the roof leg supports; or
(ii)
at the manufacturer's recommended setting.
(8) Each emergency roof drain must be
provided with a slotted membrane fabric cover that covers at least ninety
percent (90%) of the area of the opening.
(9) The roof must float on the liquid at all
times, except when the vessel is completely emptied and subsequently
refilled.
(10) The process of
filling, emptying, or refilling when the roof is resting on the leg supports
must be continuous and accomplished as rapidly as possible.
*These documents are incorporated by reference. Copies may be obtained from the Government Publishing Office, 732 North Capitol Street NW, Washington, D.C. 20401 or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.
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