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Human Factors in Process Plant Operation by David A. Strobhar

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6

Interface

I posed some questions about the displays they were using to an operator. I asked, “What do the purple lines mean?” (not sure if magenta would mean anything to him). He responded with, “Let me see. Those are infrequently used lines … no wait a minute; we use that line all the time. I’m not sure what the purple lines are for. You should ask Daryl. He built these.”

When I talked to Daryl about a variety of things, I asked, “What do the magenta lines on the graphics mean?” He was pleased to discuss his work and he said, “Magenta is for mixed phase flow (combination of vapor and liquid). I used one color for vapor and one for liquid, so I needed one for mixed flow. I really wish there were more color options available, I ran out of ...

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