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  1. Mkuchta

    Sludge in #2 Diesel Fuel

    No, it's steel.
  2. Mkuchta

    Sludge in #2 Diesel Fuel

    I agree that we are probably storing the fuel too long and not cleaning the tank out often enough. I think the residue I found in the strainer is linked to degradation and aging in the fuel but I can't find information that will allow me to compare what I found in the residue to sludge that...
  3. Mkuchta

    Sludge in #2 Diesel Fuel

    Thanks everyone. The diesel fuel is topped off every so often and the tank is cleaned every 10 years. The fuel from the trucks is tested for viscosity, sediment, and particulate contamination before it is put in the tank. I was wondering if this residue is something that normally settles out of...
  4. Mkuchta

    Sludge in #2 Diesel Fuel

    We have an underground storage tank for #2 diesel fuel that is connected to an underground pipe with a fuel pump. Just before the fuel pump is a suction strainer that is examined every 18 months. A small amount (5oz.) of black, easily broken up material was found in the strainer and I was asked...
  5. Mkuchta

    Brass fitting corrosion

    FYI, EDX quant analysis showed no difference between the normal and corroded areas. Dot maps showed slightly less copper in the corroded areas. Thanks everyone for your ideas. Btrueblood's idea seems reasonable. I've never seen this before and haven't been able to find it documented anywhere so...
  6. Mkuchta

    Brass fitting corrosion

    The fitting is exposed to the steam/ammonia/amine environment on the inside only. The copper colored discoloration is in the areas exposed to the condenser environment. The outside environment is room temperature air and no discoloration was seen in these areas. The way I understand it,SCC is...
  7. Mkuchta

    Brass fitting corrosion

    Yes it does sound like dezincification but there are no areas of only copper- the zinc is still there. After EDX analysis showed these results I took the sample to another lab for verification. I think what I am looking for is some other corrosion mechanism. No one got hurt and all fittings...
  8. Mkuchta

    Brass fitting corrosion

    I have an corrosion mechanism in a machineable brass Swagelok fitting (copper,30%zinc,2.5% lead). The fitting has was in use 20+ years in a PH 10 steam environment with <10ppm of hydrazine (which decomposes to ammonia). The part failed at the first thread of the fitting. The fitting appears to...

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