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Recent content by masg

  1. masg

    air cooled exchanger fin specification

    An air cooled, finned exchanger in amine regenerator overhead cooling service has reached the end of its useful life and needs replacement. The tube fabricator offers embedded, extruded, wrapped, or serrated-extruded. Does anyone have experience with the serrated extruded fins? By their own...
  2. masg

    allowed hydrogen content in NG

    You didn't mention how much hydrogen you would like to put into the gas. Proceed cautiously. Hydrogen will lower the specific gravity and heat content of the gas, thus affecting the performance of the burner. Hydrogen also has a much higher flame speed and wider flammability range than...
  3. masg

    hydrogen recovery via membrane purification

    I am looking for lessons learned regarding the use of a membrane separator for hydrogen recovery of FCC and coker fuel gas. Our excess fuel gas is sweetened, dried and sold to a utility as pipeline grade. We would like to reduce the hydrogen content. Any experience with these, good or bad, in...
  4. masg

    Preservation procedure for the idle equipment in refinery...

    If the equipment (piping and vessels)is primed and painted, you should be OK for external corrosion protection. If it isn't, as with insulated piping, you could experience metal loss should the metal/insulation become wet. Steve Grzywa sgrzywa@citgo.com
  5. masg

    High TAN Crudes

    We don't run those crudes. Our TAN limit is 0.5 on mixed crude charge. We're eyeing a metallurgical upgrade to 317L throughout our atmospheric and vacuum gas oil systems so we can increase the TAN and charge less expensive crude. We'd be replacing carbon steel, 5 and 9 chrome, and 410 SS clad...
  6. masg

    Sprinklers net calculation

    Don't know if free software exists. You've already consulted the Automatic Sprinkler System Handbook and/or contacted Robert Solomon of the NFPA? <p>Steve Grzywa<br><a href=mailto:sgrzywa@citgo.com>sgrzywa@citgo.com</a><br><a href= > </a><br>
  7. masg

    steam desuperheating

    we are designing a steam desuperheater ahead of a reboiler. 600 psig, 700 degF steam is being let down to 300 psig. Would like to find a desuperheater that doesn't use a external or pumped condensate, rather educts the reboiler's condensate. One design requires the reboiler to be 25 feet...
  8. masg

    We would like to cool coker cutting/cooling water below the current 12

    We would like to cool coker cutting/quench water below the current 120 - 130 degF to reduce deheading vapor cloud and hot spot eruptions. 90 degF is the target. We are considering a stand alone, direct contact cooling tower, and recycling back to the coke pit maze. Is microbio fouling of the...
  9. masg

    FORCE PRODUCED BY LIQUID PUMPED THROUGH A NOZZLE

    John,<br> Take a look at API RP 520, Part 2, for the formula you need.<br> Steve
  10. masg

    formaldehyde removal

    What happens to formaldehyde in WWTP feed? What is the source of expert data? August '99 Chemical Engineering described a process that suggested the destruction of cyanide in a WWTP if influent is pretreated w/formaldehyde first at ambient conditions. What happens to the excess or unreacted...
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