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 218.124 - External Floating Roofs
Universal Citation: 35 IL Admin Code ยง 218.124
Current through Register Vol. 48, No. 38, September 20, 2024
a) In addition to meeting the requirements of Section 218.123(b) of this Part, no owner or operator of a stationary storage tank equipped with an external floating roof shall cause or allow the storage of any volatile petroleum liquid in the tank unless:
1) The
tank has been fitted:
A) With a continuous
secondary seal extending from the floating roof to the tank wall (rim mounted
secondary seal), or
B) With any
other equipment or means of equal efficiency approved by the Agency according
to the provisions of 35 Ill. Adm. Code 201, and further processed consistent
with Section
218.108
of this Part;
2) Each
seal closure device meets the following requirements:
A) The seal is intact and uniformly in place
around the circumference of the floating roof between the floating roof and
tank wall; and
B) The accumulated
area of gaps exceeding 0.32 centimeter (1/8 inch) in width between the
secondary seal and the tank wall shall not exceed 21.2 square centimeters per
meter of tank diameter (1.0 square inches per foot of tank diameter).
Compliance with this requirement shall be determined by:
i) Physically measuring the length and width
of all gaps around the entire circumference of the secondary seal in each place
where a 0.32 cm (0.125 in.) uniform diameter probe passes freely (without
forcing or binding against the seal) between the seal and the tank wall;
and
ii) Summing the area of the
individual gaps.
3) Emergency roof drains are provided with
slotted membrane fabric covers or equivalent covers across at least 90 percent
of the area of the opening;
4)
Openings are equipped with projections into the tank which remain below the
liquid surface at all times;
5)
Inspections are conducted prior to May 1 of each year to insure compliance with
subsection (a) of this Section;
6)
The secondary seal gap is measured prior to May 1 of each year and within 30
days of a written request to demonstrate compliance with subsection (2)(B) of
this Section;
7) Records of the
types of volatile petroleum liquid stored, the maximum true vapor pressure of
the liquid as stored, the results of the inspections and the results of the
secondary seal gap measurements are maintained and available to the Agency,
upon verbal or written request, at any reasonable time for a minimum of two
years after the date on which the record was made.
b) Subsection (a) above does not apply to any stationary storage tank equipped with an external floating roof:
1) Exempted under Section
218.123(a)(2)
through
218.123(a)(6)
of this Part;
2) Of welded
construction equipped with a metallic type shoe seal having a secondary seal
from the top of the shoe seal to the tank wall (shoe-mounted secondary
seal);
3) Of welded construction
equipped with a metallic type shoe seal, a liquid-mounted foam seal, a
liquid-mounted liquid-filled-type seal, or other closure device of equivalent
control efficiency approved by the Agency in which a petroleum liquid with a
true vapor pressure less than 27.6 kPa (4.0 psia) at 294.3 ° K (70° F)
is stored; or
4) Used to store
crude oil with a pour point of 50° F or higher as determined by ASTM
Standard D97-66 incorporated by reference in Section
218.112
of this Part.
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