What kind of bottle jack was involved in the mine accident?
Investigators did not consider the weather to be a factor in the accident. The bottle jack involved in the accident was an Enerpac RR-series model RR-50024, a double-acting cylinder with a nominal stroke of 24 inches and a rated lift capacity of 500 tons.
What was the pressure of the Bottle jacks?
The pumping system applied pressure to the bottle jacks. However, the bottle jacks did not move, the gauges on the pressure side of the pump read between 7,000 and 7,500 psi, and hydraulic oil leaked out of the relief valves on the No. 2 and No. 3 bottle jacks (see Appendix A – Accident Diagram).
Who was at the pump when the accident happened?
On the day of the accident, Rivers, Begay, Jarrett, and Thygerson prepared to lift the shovel using the bottle jack system. Rivers and Begay were standing near the bottle jacks while Thygerson and Jarrett were at the pump when the accident occurred.
When did Pat Hardwick leave the King radio show?
Most recently, Hardwick was morning co-host at news-talk KING-AM. He joined KING in February 1990 and was released last April because of ratings – the morning show was rated 14th in the Seattle-Tacoma market – and because the station wanted a younger audience. Hardwick was replaced by Pat Cashman.
What makes a hydraulic jack work so well?
What makes the hydraulic jack unique is that it makes use of a liquid that is incompressible. Oil is the usual liquid used in a hydraulic jack because it is stable and self-lubricating. This liquid is then forced into a cylinder via the plunger that pumps.
Investigators did not consider the weather to be a factor in the accident. The bottle jack involved in the accident was an Enerpac RR-series model RR-50024, a double-acting cylinder with a nominal stroke of 24 inches and a rated lift capacity of 500 tons.
The pumping system applied pressure to the bottle jacks. However, the bottle jacks did not move, the gauges on the pressure side of the pump read between 7,000 and 7,500 psi, and hydraulic oil leaked out of the relief valves on the No. 2 and No. 3 bottle jacks (see Appendix A – Accident Diagram).
On the day of the accident, Rivers, Begay, Jarrett, and Thygerson prepared to lift the shovel using the bottle jack system. Rivers and Begay were standing near the bottle jacks while Thygerson and Jarrett were at the pump when the accident occurred.
