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  • Users: sayedm
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  1. sayedm

    Positive Heater Draft

    Buoyancy; Hot gasses are lighter (having lower density) the entering colder gasses. Hot gasses will go up through the stack creating a draft (slight negative pressure). There will be some pressure drop due to friction losses, obstacles like convection section pipes and stack dampers. Stacks...
  2. sayedm

    HVGO Cutpoint/Yield improvement

    The way I see it is you have cracking in the bottom of your column due to the high temp. The cracking increase the noncondensable gasses and the load on the vacuum system. Our unit is not a dry unit ( we use steam ),but the vacuum we have is 25-27 inHg60F ( if my memory serves me right; with...
  3. sayedm

    HVGO Cutpoint/Yield improvement

    Maximizing the heater outlet temp may increase the cracking in the heater, as a result more noncondensable gases will be produced, these gases will lower your vacuum and as well your HVGO cut, also reduce your unit run time. In my refinery we try to improve the vacuum in the column, you will...
  4. sayedm

    corrosion inhibitors used in pet refineries

    We use a combination of ammonia nutralizing amine (BitzDearborn) and Some nalco products. Every case is much independent of the other but the price varies with each treatment used.
  5. sayedm

    BURNING VACCUUM OFF-GAS + ACID GAS FROM SWS

    We have an VDU off gas burning in one of our units. The problem is it has a very low pressure & LHV, The gas cant be sent to the flare so we burn it in the heater. The Heater does not depend on the off gas as a primery fuel. Natural gas is used as a primery fuel. All burners burn the two gasses...
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