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  1. krsmani77

    Restriction Orifice.

    Further details are: Mechanical Engineers Area - Piping & fluid mechanics engineering Forum cbuck (Mechanical) 11/11/02 (posted 09/10/02) 44 replies "Time required to exhaust air though an oriface "[thumbsup]
  2. krsmani77

    Restriction Orifice.

    Check out this old query in one of the Engineering forums"Time required to exhaust air through an orifice"-use advanced search with "all forums" and "any date" selected. It has some 44 threads and is quite informative, Best of luck.
  3. krsmani77

    Restriction Orifice.

    Can you clarify wheher you are talking about upstream(to orifice)temperaures OR downstream pipe temperature. What is the volume hold up of the piping system whose temperature should not fall below -46 deg C? Is it being depressurised to atmosphere without any piping d/s of the orifice? Is the...
  4. krsmani77

    Running distillation column with missing trays

    Assuming you can box up the column with proper downcomer and downcomer seals in the damaged area and assuming only two products (top & bottom) from the column, you will lose about one theoretical tray (50% effcy)i.e., around 5% in total tray count. It should not really matter, as you can easily...
  5. krsmani77

    flash vessel, flash tank, flash steam, flash steam recovery

    My views: From high pressure steam condensate/blow down systems, one can recover steam at low pressures by flashing the condensate in successively lower pressure flash drums, which separate vapour from liquid with minimum carry-over of water/condensate with the steam. Such flash vessels can have...
  6. krsmani77

    Max. Viscosity in FCC MC Bottom

    Fouling in MCB exchangers is a function of Time and temperature. So when you cut down the production of MCB, two things can happen (both or one). 1. The column bottom temperature goes up. 2. The residence time in column bottom as well the exchangers go up. You can possibly by maintaining a...
  7. krsmani77

    Atmospheric residue filter plugging

    Another thought. Why not trap them in a regular Basket Filters ( twin duplex, sized to suit your cleaning schedule and with back wash facility) where it is convenient for you to trap them (if not possible in tanks or desalters)? May be that is what you are doing in yr ARDS filters.
  8. krsmani77

    Atmospheric residue filter plugging

    You have double desalting. Have you ever cleaned the desalters? How is the interface - clean or full of interface muck? This prevents proper water settling. This may occasionally get carried over during process upsets such as crude switch. Also the water carryover to the heaters can create a...
  9. krsmani77

    Sump pit in the crude tank

    Water draining may pose problems at times due to emulsion formation. Emulsion itself may be about a foot high. Heating the tank bottom by providing steam coils may help to break the emulsion. Try to get an idea of emulsion height and assuming most of it is water, try operating at a safe ( very...
  10. krsmani77

    Condensation?? in compressor suction lines

    Sorry, it is a generic name. Thanks anyway.
  11. krsmani77

    Viscosity Conversion

    Hope your Vac resid's pour point is well below 50Deg C. Otherwise no correlation/extrapolation will give anything useful. Normally Vac resid will have some amount of lighters in it, depending on degree of fractionation, cracking in the furnace,etc, So it is best to do a lab check on each...
  12. krsmani77

    Condensation?? in compressor suction lines

    Dear Unitradingco, The compact cylindrical cyclone separator(CCCS), is just a cylindrical vessel with no internals. The feed inlet is tangential and the vessel dia is double that of inlet nozzle. Inlet dia is 250mm. Feed is Nitrogen gas saturated in hexane( not pure) solvent vapours( Boiling...
  13. krsmani77

    Fuel Gas Purge

    One thing I forgot to mention: By measuring the purge gas line pressure itself(provided flow is low), one can know the level or the pressure at the point of injection ( provided the pressure drop is negligible). You can eliminate the the other instrument altogether(provided it is not a DP). That...
  14. krsmani77

    Fuel Gas Purge

    If you have condensation problems, have you considered fuel gas itself may also condense? One of the solutions will be to provide drain pots (3" dia and 1 ft long) below the DP in continuation of the impulse lines and occasionally drain them(!!).Also try heat tracing and insulating the...
  15. krsmani77

    Condensation?? in compressor suction lines

    Thank you all for the sustained interest. Dear unitradingco, Actually, the centrifugal force (V**2/R)is 160 G but When compared with the new large dia gravity KO pot which we tried, the inertial forces dropped due to lower velocities and so in comparison, the ratio was 30. But since we have gone...
  16. krsmani77

    Desalter PSV Sizing

    I can think of five possibilities for the Desalter safety to pop: 1. Some downstream block valve ( e.g.,exchanger isolation valve) is closed accidentally. 2. The heater Flow control valves at the heater inlet are closed for handling a tube rupture or such emergencies. 3. The desalter has been...
  17. krsmani77

    Condensation?? in compressor suction lines

    Thanks guys. The inlet velocity is around 20Meters/sec. Much less than yr 135ft/sec limit and so should not be a problem. Still all of you are talking about gravity separation. How about the centrifugal separation? It is 30 times more than "g". [nosmiley]
  18. krsmani77

    Vacuum Tower Overflash pumps

    Dear Falcon3, I will answer this question from my refinery experience. Points to note and absorb are: 1. In a vacuum column, the role of overflash ( sometimes called vacuum slop or demister wash ) is to control the quality of fcc feed stock/heavy neutral (lube distillate) which is the cut drawn...
  19. krsmani77

    Condensation?? in compressor suction lines

    The inlet/oulet Re No is around 275000. So that should not be a problem from what you say. The mech seal is a standard gas mech seal known as "emission controlled non-contact externally flushed mech seal"( pure Nitrogen gas flushing- Mode GF200), supplied by Duromaetallic. It is...
  20. krsmani77

    Condensation?? in compressor suction lines

    Thanks guys. But the compressor is actually a twin lobe blower, which does not tolerate the liquid carry over. The K.O.Pot is a narrow vertical NO INTERNALS TANGENTIAL Compact Cyclone separator, for which there does not seem to be any reference in Separator Literature.Any ideas how to check its...

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