What is typical for sending HOA switch position status to a PLC for garden variety process control?
One signal & one PLC input for explicit status of each of the three positions, or two (Hand/Run and Auto) with Off being implied by the state of the other two? I'm thinking false status via wire...
A client wishes (to their credit only if totally acceptable from H&S perspectives) to re-purpose a 6000 gallon, U-Stamped pressure vessel for use in a process which will generate about 4 lbs/min of H2S in the head space. IDLH is 100 ppm; a small leak would have serious H&S consequences. We have...
I need advice from folks who know more about this than I do; sorry I have to be so vague.
Question: What material should be used for this service, CS or Stainless are the only options for various reasons including -20F operational temps and plant prohibitions. It’s a 4” compressed air process...
