Recent content by Restaurant at the Edge of the Universe

  1. R

    Impulse Line Insulating Materials & Solutions

    Hi To answer your counter query: Heat tracing most applications - as needed of course. However there are instances where because of the insulated process line, the process temperature itself and the relatively short impulse line connection, it is expected that the process heat will keep the...
  2. R

    Impulse Line Insulating Materials & Solutions

    Just for insulating instrument impulse lines ( hydrocarbon- Class 1 Div 1 or 2) without the heat trace, I wouldlike to know the most cost effective and fit for purpose cold weather insulating materials and solutions. Any text or source of reference on that?
  3. R

    Symbology for Speed Controller on Pneumatic Valve

    ISA S 5.1 does not show symbol for a pneumatic speed control unit for a pneumatic valve. However, it is common to see a variable restriction with a check valve orientation to depict speed controller ( metered in or metered out). Is there any standard document ( e.g., ISA) that provides...
  4. R

    Installed Gain Plot for PCV

    For a control valve : Texts show the installed ( process) gain plots taking into consideration the flow rates through a valve. How to work that out if we have PITs in the line around the PCV and no flowmeters ?
  5. R

    PLC I/O Fusing -II

    Is individual PLC I/O channel fusing - code requirement or vendor preference or just good practice ?
  6. R

    PLC I/O Fusing

    Typically in 120 VAC PLC panels how can the code be correctly applied for fusing from a control transformer to loads such as electronic modules. One main fuse from the line side of the 120 VAC power supply and then branch fuses for each module is normally implemented. However if we have a...
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