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 F - RELEASE DETECTION › Section 175.640 - Methods of and Requirements for Release Detection for Piping

Current through Register Vol. 48, No. 28, July 12, 2024
Owners and operators of petroleum USTs shall provide release
				  detection for all piping containing regulated substances. The release detection
				  must meet the requirements specified in this Section.
a) Pressurized piping systems shall comply
				with the following requirements:
1) Every
				pressurized piping line installed after February 1, 2008 shall be equipped with
				interstitial monitoring sensors at all piping sumps, dispenser sumps, and
				piping junction sumps. For installations and replacements after September 1,
				2010, these sensors must immediately shut off the submersible turbine pump
				(STP) supplying that line upon detection of a release, except for USTs serving
				emergency power generators. Sensors for USTs serving emergency power generators
				shall trigger a local alarm upon the detection of a release. The automatic
				shutoff shall be deactivated in any UST serving emergency power generators when
				that function has been previously installed. Pursuant to Sections
				175.630(f)  and
				175.610(a)(4),
				all interstitial monitoring sensors shall be tested annually, and the sensors
				inspected for operability at least once per month and a record of the
				inspection results generated.
2)
				All new and existing sump sensors must be installed so as to detect liquid per
				manufacturer's specifications or, if not specified by the manufacturer, at the
				lowest point in the sump.
3) Both
				new and existing pressurized piping installations shall be equipped with
				automatic line leak detectors. Mechanical and electronic line leak detectors
				that alert the operator to the presence of a leak by restricting or shutting
				off the flow of regulated substances through piping or triggering an audible or
				visual alarm may be used only if they detect leaks of 3 gallons per hour at 10
				pounds per square inch line pressure within one hour, except for USTs serving
				emergency power generators. All line leak detectors must have a functionality
				test performed annually pursuant to Section
				175.610(a)(4).
				Self-diagnosing line leak detectors are not alone sufficient to meet the
				requirement for an annual functionality test. Automatic line leak detectors for
				USTs serving emergency power generators shall trigger a local alarm upon the
				detection of a release. Any automatic flow restriction or shutoff shall be
				deactivated in pressurized piping serving emergency generators when that
				function has been previously installed.
4) In addition to utilizing automatic line
				leak detectors, pressurized piping systems shall utilize either line precision
				testing pursuant to this subsection (a)(4) or monthly monitoring pursuant to
				subsection (c). Line precision testing requirements may be met by one of the
				following methods:
A) Pressurized lines must
				have an annual precision test that is capable of detecting a
				0.1 gallon per hour leak rate at
				1.5 times the operating pressure
				for 30 minutes. Use of an inert gas to pressurize piping is also acceptable.
				Use of air to pressurize piping that contains product is prohibited.
B) The use of electronic line leak detection
				that is able to detect a
				0.1 gallon per hour leak at
				1.5 times the operating pressure
				in an annual precision test of the line, with the records of the 2 most recent
				annual precision tests kept on site or available within 30 minutes or before
				OSFM completes its inspection, whichever is later.
C) A method meeting the requirements of the
				NWGLDE publication "List of Leak Detection Evaluations for Storage Tank
				Systems", as referenced in 41 Ill. Adm. Code
				174.210, or, if unavailable, as
				approved by OSFM.
D) In the case of
				a suspected release, tracer elements and line testing using the automatic tank
				gauge (ATG) are not approved methods of line precision testing.