February 2006

Rotating Equipment/Reliability

Pitfalls of operating pumps at part load

The risk in terms of reduced reliability and safety is not worth it

Bloch, Heinz P., Hydrocarbon Processing Staff

When a colleague and well-respected reliability professional living in Southern California recently saw the initial draft of this article, he offered an unusual critique. He had just returned from overseas installation "A" that claimed risk need not be considered in calculating the cost of demonstrated unreliability. Both he and I believe that risk must be considered and that not doing so puts into question the entire concept of reliability engineering. In view of this rather incomprehensible stance by the overseas installation and having personal knowledge of the dangers of routinely operating pumps in parallel, the California-based professional thought that HP should be more forceful in

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