Thinking in Systems, Troubleshooting with Principles

The Hydraulic Troubleshooting HandbookJules Nijst is a retired oilwell engineer from the Netherlands. He read The Hydraulic Troubleshooting Handbook recently and sent me this note:

“I’ve received your book and what a great book this is. Brendan, this book is a delight to read. So well explained in short paragraphs to encapsulate a fact. I catch myself becoming aware all the time while reading,

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Can You Set a Relief Valve Using a Hand Pump?

Photo credit: Colin Kinner

A millwright recently completed a 5-day basic hydraulics training. He plans to use his recently acquired hydraulics knowledge to check and set the relief valves in the circuit shown below, using a hand pump. Valves 04 and 06 are both relief valves (no external drains are shown). The rear section of the tandem pump 01 provides two pilot pressures: Pp1 … Read more

Hydraulic Component Life Expectancy and How To Manage It

axial piston pump failureThe original life cycle bathtub curve was based on the cycle of human life. And at some point last century it was adapted by reliability engineers working in the electronics manufacturing industry to graphically represent the failure rate of their products. As you can see from its depiction below, the Observed Failure Rate–the top, bathtub curve, is the product of … Read more