For TransCanada PipeLines, the need to retrofit station and compressor unit controls has been driven by the requirements to improve reliability, availability and cost and difficulties associated with interfacing new digital control systems with existing analog systems. TransCanada’s massive four year expansion program has exacerbated this need.

TransCanada’s turbo compressor controls are becoming obsolete, they are difficult to troubleshoot and maintain, do not control a unit as effectively as newer digital controls and do not have adequate operator or technician interfaces and diagnostics.

This paper describes TransCanada PipeLines reasons and experiences in retrofitting state-of-the-art digital controls in a cost effective manner while minimizing service interruptions.

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