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  1. Naiduat

    Foaming in recycle gas amine absorber

    Recently, we have noticed foaming and high pressure drop in our recycle gas amine absorber column in our Diesel HDS unit. DEA is being used in the system. The column was isolated , water washed and put back in service. However, the foaming problem still persists. The antifoam chemical (non...
  2. Naiduat

    H2 compressor failure

    At our refinery, two nos of Nuovo Pignone (NP) make reciprocating compressors (single stage, two cylinders per stage, double acting type) are installed in H2 service in DHDS plant. Recently, one of the compressors (running) cylinder no.2 discharge valve cover bolts (4 out of 6) came out from the...
  3. Naiduat

    Chlorides in Amine

    1. Chlorides of about 2000-3000 ppm are being observed in the lean amine of our amine regerator system. The existing sea water coolers in the system were checked for tube leaks and found no leaks. What could be the possible reasons for the same? 2. The reflux of amine regerator indicates amine...
  4. Naiduat

    Leaking of Sweet Naphtha vapouriser exchanger in H2 unit

    Our Hydrogen plant is designed by M/s Technip. In the feed desulphurisation section, an exchanger (Process gas from HT shift reactor Vs Sweet Naphtha) is suspected to be leaking. The MOC of the tubes and shell is 1 ¼ Cr ½ Mo. Sweet Naphtha is on tube side and HT shift effluent is on shell side...
  5. Naiduat

    Simulation of Atmospheric crude columns

    I would like to know the following while simulating the existing columns 1. The parameters to be matched with actual values? Draw off temperatures, yields product qulaity etc. 2. Is there any stepwise method available on how to simulate the column?
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