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Title: LEVERAGING USM DIAGNOSTICS FOR OPERATIONAL EXCELLENCE
Author: Pam Ryan
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: Equitrans Midstream (ETRN) operates a large natural gas gathering system and a mid-size transmission system in the Appalachian Basin, transporting approximately 8.3 BCF of gas daily (as of year-end 2021). Monitoring the volumes and gas quality is a critical component of ETRNs operations. The ultrasonic meter (USM) is ETRNs preferred meter, with over 750 units in service and more than 91% of ETRNs throughput metered with USMs. We use various types of USMs - non-custody clamp- on USMs for compressor throughput, dehy slipstream, operating large valve yards and odorizers and several styles of multi-path, custody-grade USMs at gathering, storage, transmission, and distribution meter sites. With 400+ USMs at the inlets to ETRNs gathering system, monitoring the gas quality (GQ) and the various measurement parameters, including pressure, temperature, and meter diagnostics (together known as meter health) is essential to supporting safe, reliable, and efficient operations. Meters in the gathering systems are known to be in harsh service. These meters can be exposed to formation sands, free water, NGLs, glycol or well treatment chemicals. Tariffs and gathering agreements typically prohibit these contaminants however, there are instances when contamination occurs. Contaminants can reduce the pipeline capacity cause operating issues at meters, control valves, filters, dehys and compressors and may eventually result in internal pipe corrosion.

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