Illinois Administrative Code
Title 83 - PUBLIC UTILITIES
Part 501 - STANDARDS OF SERVICE FOR GAS UTILITIES AND ALTERNATIVE GAS SUPPLIERS
Subpart B - NATURAL GAS MEASUREMENT REQUIREMENTS
Section 501.320 - Gas Chromatograph

Universal Citation: 83 IL Admin Code ยง 501.320

Current through Register Vol. 48, No. 38, September 20, 2024

a) A utility shall install all gas chromatographs according to the recommendations of the device's manufacturer.

b) A utility shall set all in-service gas chromatographs to perform an automatic calibration at least once every 24 hours. If the utility is using the chromatograph to assist the measurement calculation at a utility-owned natural gas storage facility and the facility is not injecting or withdrawing natural gas, the utility may suspend the calibration of the chromatograph until the facility resumes injecting or withdrawing natural gas.

c) A utility shall perform field verification of all in-service gas chromatographs at least every 3 months and verify that the un-normalized mole percent variance is within ±1.5 % of the gas contained within the calibrated gas cylinder.

d) A utility shall certify or replace the calibrated gas cylinders at least every 36 months.

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