Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 721 - IDENTIFICATION AND LISTING OF HAZARDOUS WASTE
Subpart BB - AIR EMISSION STANDARDS FOR EQUIPMENT LEAKS
Section 721.954 - Standards: Pressure Relief Devices in Gas/Vapor Service
Universal Citation: 35 IL Admin Code ยง 721.954
Current through Register Vol. 48, No. 38, September 20, 2024
a) Except during pressure releases, each pressure relief device in gas/vapor service must be operated with no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, as measured by the method specified in Section 721.963(c).
b) Actions following pressure release.
1) After each pressure
release, the pressure relief device must be returned to a condition of no
detectable emissions, as indicated by an instrument reading of less than 500
ppm above background, as soon as practicable, but no later than five calendar
days after each pressure release, except as provided in Section
721.959.
2) No later than five
calendar days after the pressure release, the pressure relief device must be
monitored to confirm the condition of no detectable emissions, as indicated by
an instrument reading of less than 500 ppm above background, as measured by the
method specified in Section 721.963(c).
c) Any pressure relief device that is equipped with a closed-vent system capable of capturing and transporting leakage from the pressure relief device to a control device as described in Section 721.960 is exempt from the requirements of subsections (a) and (b).
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