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  1. NCENG78

    Heat Transfer Fluids Valve Selection

    We have a mixture of isolation valves in our plant for Hot Oil (CALFLO). Triple offset butterfly, globe (Y and std), and gate. For pure line stop valves would you chose Butterfly, Y globe, or Gate? Oil runs at 550F
  2. NCENG78

    Ball Valve Vs Plug Valve Process

    Sorry if there's another post relating to this. I searched but couldn't find any. The vast majority of chemcial sites that i've been to or worked at use flagned 150# stainless ball valve with some form of soft seat for process lines. One site I visited is using plug valves for process instead...
  3. NCENG78

    Hot City Water Galvanized Pipe

    I need to replace an older Hot City water piping system. Water is heated in a storage tank and piped to vessel jackets for heat. Temperature of the system is 75C. No treatment chemicas are added as this water is used for vessel cleaning. Its currently galvanized pipe. At previous sites...
  4. NCENG78

    What is a chemical trasar?

    3d Trasar is NALCOs online system which monitors chemical levels in water treatment of boilers, cooling towers, etc. It will also handle boiler blowdowns among other things. It’s usually hooked to chemical feed tanks with pumps to dispense the chemical into the system.
  5. NCENG78

    PSV Required Testing

    If I'm reading the code right I'm required to do a functional test of my PSV every 2 or 3 years depending on class. Can someone help me out of the functional test? For or reactor PSVs we send to a VR facility every year for testing but for steam, nitrogen, and air we test by lifting the handle...
  6. NCENG78

    MAWP Jacket

    I got one. I have a ASME code pressure vessel with a dimple jacket. The jacket was assumed to be rated at 75 PSIG @ 575F MAWP, but the U-1 indicates its 45 PSIG @ 575F. Is there a process to get the jacket rating increased?
  7. NCENG78

    Fire Safe valve

    What code should I review in th US to determine if I need to use firesalve? I know API 607 covers the valve itself but what standard governs the use of fire safe valve?
  8. NCENG78

    Fire Safe valve

    When are you required to use a fire safe valve?
  9. NCENG78

    Hazardous Location Wiring

    Yes USA.
  10. NCENG78

    Hazardous Location Wiring

    Can anyone give me a good reference book for electrical installation in hazardous locations? Defines need for seal offs, types of conduit, etc.
  11. NCENG78

    RTD Calibration

    Sorry I meant RTD
  12. NCENG78

    Steam Service Piping Material <150 PSIG

    Sorry. didn't even know we had that option. Done.
  13. NCENG78

    Steam Service Piping Material <150 PSIG

    Thank you!!!
  14. NCENG78

    Steam Service Piping Material <150 PSIG

    Currently my company uses ASTM A53 Grade A for all steam and condensate service. Our main boiler pressure is 130 PSIG. Can someone help explain to me why you would use one or the other and if ASTM A53 Grade A or B is acceptable for my application? My previous company use ASTM A106 for steam...
  15. NCENG78

    RTD Calibration

    We exclusively use RTDs at our site for temperatures measurement. For 75% of the time we have an associated transmitter, but for our older facility we have RTD going straight back to the DCS IO Card. So for ISO reasons we have to calibrate each RTD each year. For the transmitters we simply...
  16. NCENG78

    Malleable Iron fittings ASTM A197 vs Forge Carbon Steel ASTM 105

    Sorry I couldn't find my post. I usually post in Chem Eng and somehow end up in Mech Eng. Thanks for all your help
  17. NCENG78

    Malleable Iron vs Forged Carbon Steel Fittings

    Well I'm trying to find some information on why I would use malleable vs forged CS fittings. Our current piping specificaion for general water service uses ASTM 53 grade B pipe and malleable fittings. Can someone please tell me when I should and should use malleable vs forged CS fittings. Thanks
  18. NCENG78

    Malleable Iron fittings ASTM A197 vs Forge Carbon Steel ASTM 105

    Currently my plant uses interchangeably malleable iron and forged CS fittings. I was wondering if someone could help explain the advantages and disadvantages of both. Why would you use one over the other when the pipe is ASTM 106 or ASTM A53 Grade B.
  19. NCENG78

    Pocket Guide to Chemical Engineering Carl Branan

    Thanks for all the input. I went with Rules of thumb for ChE.
  20. NCENG78

    Pocket Guide to Chemical Engineering Carl Branan

    I was just checking to see if anyone owns Pocket Guide to Chemical Engineering or Rules of Thumb for Chemical Engineers by Carl Branan. I get a little tired of hunting through my Perry's and would like to get a more condensed reference source. My colleague recommend Pocket Guide to Chemical...

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