Expert-level knowledge of ASME B31.8 (Gas Transmission and Distribution Piping Systems), 49 CFR Part 192, API 618 (Reciprocating Compressors), API 617 (Centrifugal Compressors), API 619, API 692 (Dry Gas Seals), API 520/521, and ASME Section VIII Div 1/2. Hands-on expertise or oversight capabilities with gas hydraulic and compressor performance tools (e.g., AFT Arrow, AFT Impulse, Synergy, HYSYS/UniSim, Pipe-Flo, CAESAR II, or proprietary OEM compressor sizing tools like Ariel Performance / Solar Compressors).