What oil is best? and what ratio?

[bwalker]

I worked for a number of years with some engineers who did HAZOPs and design support at a couple of refineries in the Billings area.

PSM touches on alot of HAZOP items. Work often with engineers on that sort of thing..Also sit in on model reviews and the like to give Operations point of view. The refineries are in a state of constant change so there is always work.