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  1. ChemStel

    Refinery Planning

    Yes, chemical engineers plan refineries. If you take issue with this post under this section, then stick to pumps only.
  2. ChemStel

    Refinery Planning

    This question is specifically related to refinery LP and pricing. Hopefully this is the right section to post it. For our input prices for crude for the current month we use Brent Dtd + the differential on the crude at which the crude can be purchased today for delivery in M+1, 2 etc.. i.e. the...
  3. ChemStel

    Reducing drainage time

    Snorgy, Correct. There are internals. A frame holding 12 containers, which in turn hold the items being washed. I was incorrect in saying the vessel is open-vented. The vent line is fitted with a pressure-vacuum relief valve. The vacuum setting is -15 mBar. Looking at the vessel in...
  4. ChemStel

    Reducing drainage time

    Thank you all for your useful contributions. You have provided the possible solutions I was looking for to reduce drainage time. Snorgy, The service is wash water, that it used to wash down the acid from the previous process step. The acid is pumped out for re-use, while the water is...
  5. ChemStel

    Reducing drainage time

    Sorry, I may not have made myself clear. The drainage time of the line is not important, only the tank. I was just wondering if I raise the tank, which increases the height relative to the drain line outlet, will this aid draining the tank any quicker? Is there any way of calculating whether...
  6. ChemStel

    Reducing drainage time

    Thanks Latexman, If the drain line is made to slope, i.e. by raising the vessels, will this have any impact? If yes, how so? Also, I have calculated the drainage time, assuming a drain line double the size of the existing and the result is encouraging. Is the Crane equation subject to any...
  7. ChemStel

    Reducing drainage time

    I have read the other threads regarding drainage on eng-tips but couldn't seem to find the answers I need. I have a vertical, cylindrical, dished end vessel filled with water. Inside diameter is 394mm. Working height is 1313mm. Working volume is 160 litres. Inside diameter of outlet nozzle...
  8. ChemStel

    Acid relief valve

    Can anyone point me in the right direction to a guide for sizing of a relief valve / bursting disc. API2000 seems to be directed to the petrochemical industry or flammable materials. My application is the boiling of nitric acid in a 200 litre vessel by immersion heating. There are no flammable...

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