TITLE 83: PUBLIC UTILITIES
CHAPTER I: ILLINOIS COMMERCE COMMISSION
SUBCHAPTER d: GAS UTILITIES
PART 501 STANDARDS OF SERVICE FOR GAS UTILITIES AND ALTERNATIVE GAS SUPPLIERS
SECTION 501.140 COMPRESSIBILITY AND SUPERCOMPRESSIBILITY
CHAPTER I: ILLINOIS COMMERCE COMMISSION
SUBCHAPTER d: GAS UTILITIES
PART 501 STANDARDS OF SERVICE FOR GAS UTILITIES AND ALTERNATIVE GAS SUPPLIERS
SECTION 501.140 COMPRESSIBILITY AND SUPERCOMPRESSIBILITY
Section 501.140 Compressibility and Supercompressibility
a) A utility shall account for compressibility when metering gas at pressures greater than 15 pounds per square inch gauge (psig).
b) A utility shall account for supercompressibility in the flow equation used in orifice metering.