Illinois Administrative Code › Title 41 - FIRE PROTECTION › Part 175 - TECHNICAL REQUIREMENTS FOR UNDERGROUND STORAGE TANKS AND THE STORAGE, TRANSPORTATION, SALE AND USE OF PETROLEUM AND OTHER REGULATED SUBSTANCES › Subpart E - CORROSION PROTECTION › Section 175.500 - Interior Lining and Lining Inspection of USTs

Current through Register Vol. 48, No. 28, July 12, 2024
a) Tank Lining Requirements. Lining of tanks
				shall no longer be allowed for all permit applications received on or after
				January 1, 2011. Existing lined tanks shall be allowed to use lining as a
				primary method of corrosion protection only if the tanks continue to pass the
				lining inspections as provided in this Section. Tanks failing to pass the
				lining inspection criteria will not be allowed to be touched up, repaired,
				totally relined or put back into use and shall be placed out of service
				immediately and decommissioned within 60 days after the lining inspection. As
				an alternative to decommissioning after a tank fails an internal lining
				inspection, that tank may be upgraded by installing a self-structural tank
				provided the tank material and installation procedure are third party listed
				for its intended use, and shall meet all other requirements of OSFM rules.
				Installation shall meet all requirements of the UL 1316 certification and the
				installer's recommended procedures and instructions, as well as established
				industry guidelines. The upgrade shall require submission of an OSFM Upgrade
				permit application within 60 days after the failed lining inspection, and the
				work may only be performed by an OSFM-licensed contractor in accordance with 41
				Ill. Adm. Code 172. The permit application shall be accompanied by either a
				passing tank precision test report or a site assessment report based on soil
				borings taken around each tank being upgraded. This kind of upgrade shall be
				designated as an OSI activity that may not proceed without the presence of an
				STSS on site. If the upgrade permit application is not submitted within 60 days
				after the failed lining inspection, any tank that failed its lining inspection
				shall be decommissioned.
1) The manufacturers
				of materials used to line tanks for the storage of petroleum or hazardous
				substances shall certify compatibility of the lining material with products to
				be stored by submitting to OSFM data as required by Section A4.6 of NLPA 631. On or after May
				2, 2023, only tanks that are double-walled and equipped with interstitial
				monitoring may be lined for purposes of compatibility. Testing and inspection
				of linings and lining materials shall meet the specifications and procedures
				required by NLPA 631.
2) Interior
				Lining Procedures. Tanks that are double-walled and equipped with interstitial
				monitoring may be lined only once by following the steps outlined in this
				Section.
A) Tank Entry. Before entering
				tanks, the procedures described in API 2015, incorporated by reference in 41
				Ill. Adm. Code 174.210, shall be complied with.
				These requirements include checking the oxygen content inside the tank with a
				properly calibrated oxygen monitor. At all times, personnel entering the tank
				shall be equipped with positive pressure air supplied equipment with full face
				enclosure and safety harness connected to a safety line held by an attendant
				located outside the tank and using a tripod with a mechanical winch adequate to
				lift the person and equipment working inside the tank. Oil and water resistant
				rubber or neoprene boots and gloves shall be worn. Clothing shall cover the
				arms, legs, torso and head of tank entry personnel. Disposable clothing,
				impervious to product, is preferred. Clothing saturated with product shall be
				removed immediately upon departure from the tank. Tests with the combustible
				gas indicator and oxygen monitor shall be performed periodically in the tank to
				ascertain that the tank vapors and oxygen content are in the safe range. It
				shall be recognized that if the tank is perforated, product or vapors that have
				leaked into the soil may re-enter the tank through a perforation. The vent line
				shall remain clear and unobstructed to allow continuous ventilation. All other
				lines and openings shall be plugged or capped off to insure no liquids or
				vapors may enter the tank during the lining operation.
B) Structural Criteria. Prior to the
				application of lining, a structural criteria inspection shall be performed and
				the results of that inspection documented, as to whether the tank or tanks to
				be lined meet each of the structural criteria to be eligible to be lined
				pursuant to NLPA 631, and this subsection (a)(2)(B). The records from the
				structural criteria inspection shall be retained by the owner/operator for the
				life of the tank. Lining of tanks shall not be allowed if:
i) The shell or heads are more than 2% out of
				round;
ii) The shell or heads have
				one or more flat spots that have a cross measurement greater than the radius of
				the tank endcap;
iii) The shell or
				heads have any dent with a cross measurement greater than the radius of the
				tank endcap;
iv) The shell or heads
				have any dent that protrudes into the tank a distance greater than one inch for
				every foot of tank radius;
v) The
				shell or head has any seam split greater than 1/2 inch wide or 
				1/6 of the
				circumference of the tank in length;
vi) The unrepaired shell or head thickness is
				less than 75% of the original tank thickness;
vii) The number of perforations, not larger
				than 1/2 inch, per 500 square feet of tank exceeds the limits in Table
				A10.4.2.4 of NLPA
				631; or
viii) There are any welded
				repairs on the inside of the tank.
C) Application of Lining. Prior to the
				application of lining material, a 1/4 inch steel reinforcing plate rolled to
				the contour of the tank and with minimum dimensions of 8 inches by 8 inches
				shall be installed under the fill (drop) tube and gauging tube. This plate
				shall be covered with fiberglass cloth embedded in resin. The blast-cleaned
				surface shall be coated within 8 hours after blasting and before any visible
				rusting occurs. Only those lining materials meeting the specifications in API
				1631 and NLPA 631 shall be used. Manufacturer's instructions are to be complied
				with on handling and mixing of resin compounds, and these compounds shall be
				applied to the entire interior surface of the tank by the manufacturer or the
				manufacturer's designated distributor following the specified method of
				application, to the designated thickness and at the recommended application
				temperature. If a heater is used to accelerate the curing process, all other
				work which might release flammable vapors shall be halted, and the heating unit
				shall be attended whenever it is in operation. The coating shall be cured
				thoroughly to the manufacturer's specifications and checked for air pockets and
				pinholes using a holiday detector. If any exceptions are found, they shall be
				repaired to manufacturer's specifications. The licensed contractor shall
				protect the coated surfaces from contamination by foreign matter. The coating
				thickness shall be checked with an Elcometer Thickness Gauge or equivalent and
				tested for hardness using a Barcol Hardness Tester or equivalent to ensure
				compliance with manufacturer's specifications.
D) Tank Closing. If a tank has been
				previously lined and passes its internal inspection, the following may be done
				in lieu of the manway requirements of subsection (a)(2)(E):
i) A 1/4 inch thick steel cover plate, rolled
				to the contour of the tank, shall be made to overlap the hole at least 2 inches
				on each side (e.g., should measure at least 26 inches by 26 inches, if manhole
				was cut 22 inches by 22 inches);
ii) The cover shall be used as a template to
				locate 3/4 inch diameter holes not exceeding 5 inch centers, one inch from the
				edge of the cover;
iii) The cover
				plate shall be sandblasted to white metal on both sides, and the entire inside
				surface shall be coated with coating material to act as a gasket;
iv) After being bolted to the tank, the cover
				plate and surrounding tank surface shall be properly sandblasted, coated with
				coating material and allowed to cure before backfilling the hole;
E) Tank Closing after Entry
				Procedures. When a tank is being lined the following shall apply:
i) Attach a manway no less than 18 inches in
				diameter that fits the contour of the tank. This manway shall be surrounded
				with self-supporting material and be accessible from surface grade.
ii) The manway shall be used as a template
				around which will be located 3/4 inch diameter holes, 5 inches apart from
				center to center, one inch from the edge, and overlapping the entry hole at
				least 2 inches on each side, or welded in place if soil conditions will allow
				(no contamination is present). The lining material shall extend into the neck
				of the manway.
F) Tank
				Lining Shall Conform to NLPA Standard 631. Original field notes documenting
				that the pre-lining inspection and tank lining application process complied
				with the requirements of NLPA Standard 631 shall be kept by the owner/operator
				for the life of the tank.
G) Within
				5 years after lining, and every 5 years thereafter, the lined tank shall be
				internally inspected and found to be structurally sound with the lining still
				performing in accordance with original design specifications. An interior
				lining inspection permit under Section
				175.300 must be obtained to do
				an internal inspection. The results and data from the lining inspection,
				including whether the tank passed or failed, shall be kept by the tank owner
				for the life of the UST. The licensed contractor shall notify STSS of any tanks
				that fail the lining inspection prior to STSS leaving the UST site.
3) Internal Lining Combined with
				Cathodic Protection. Some tanks may exist that were previously upgraded by both
				internal lining and cathodic protection. Such tanks were to be inspected for
				both the internal lining and the cathodic protection within 90 days after the
				upgrade and must continue to be maintained by regular inspections of the
				cathodic protection system pursuant to the requirements of Section
				175.510.