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  • Users: processrj
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  1. processrj

    BFW Contamination with HC material

    Greetings, We experienced an oily contamination (*) in the high grade condensate used for four 550 psig pressure boilers. During two days the ph of the boilers' blowdown were detected by portable analyzers getting reduced from an average of 10 to about 6.5 - 8.0. Any ideas what might have...
  2. processrj

    unleveled or uneven floating roof in maintenance position

    A 72' diameter tank x 48 feet height, single deck floating roof tank has been overhauled (overall roof, support legs,and roof drain line replaced,along with some parcial repair made to the bottom plate by patching some small portions). After conducting hydrotests, we observed that the roof...
  3. processrj

    Pitting Vs. Uniform Corrosion

    What is considered to be Pitting Corrosion and what are the main causes/factors that determine it in CS heat exchanger tubes? In turn, what are the answers to these questions for the case of Uniform or General Corrosion? Thanks!
  4. processrj

    Tube leakages in 4 Pass Heat Exchanger

    There is a 4 tube pass/1 shell pass heat exchanger experiencing failure (leaks) at some especific middle tubes of the 1st pass (6 tubes out of 125 total in the 1st pass). Localized corrosion seems to be taking place on the tubes outside, toward the floating head. Process conditions / are...
  5. processrj

    Catalyst Activity Calculation

    For a solid catalyst used in a heterogeneous reaction system, how is its activity normally express (units)? How is it calculated/estimated?
  6. processrj

    Safety Relief Valve Chattering due to oversized valve

    thread1203-186657 I have seen throughout this forum many threads dealing with PSV chattering. One of the causes for this phenomena being valve over sizing. Accordingly, to avoid it Required capacity should be greater than 25 % the Rated capacity. Does anyone know and can provide a reference to...

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