LNG Application Profile - Pipeline gas compression stations using variable frequency drives
LNG Application Profile: Gas pipeline compression challenges and the case for electrification: outlines VFD-based electric drives to improve efficiency, reliability, and emissions versus gas engines.
The Oil and Gas LNG Pipeline Compression Application Profile white paper examines the operational challenges involved in natural gas pipeline compression, particularly the dynamic factors that impact compressor performance. These include fluctuations in pressure, flow demand, gas composition, temperature, and pipeline conditions, all of which require continuous adjustment of compressor speed and torque to maintain efficient throughput. The document highlights key risks such as surge events, where airflow reverses within a compressor, leading to instability, vibration, and potential equipment damage.
To address these challenges, the document presents electric motor-driven compression systems using variable frequency drives (VFDs) as a modern alternative to traditional gas engine-driven compressors. It focuses on the PowerFlex® 6000T medium voltage drive, which is designed to deliver precise speed control, adaptive load handling, and stable operation across a wide range of conditions. Features such as soft start capability, surge mitigation, harmonic reduction, and automatic load monitoring help improve operational efficiency, reliability, and overall system performance.
The document also emphasizes the benefits of advanced capabilities including predictive maintenance, remote monitoring, modular design, and automatic fault bypass, all of which contribute to higher uptime and reduced maintenance complexity, particularly important for remote or harsh environments.
Additionally, it introduces the concept of dual-drive systems that combine electric motors and gas engines, enabling operators to switch between power sources based on cost, availability, and operational requirements. Finally, the document compares gas turbines and electric VFD-driven systems, highlighting trade-offs in efficiency, emissions, maintenance, and reliability. Electric solutions are positioned as a cleaner, more efficient, and increasingly viable option, especially where grid power is available.
Download the white paper to learn more.