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  1. Mad1974

    Pipeline external algae formation

    Hi LittleInch, Thank you very much for you feedback. You are righ, pipe system temperature slightly below atmospheric temperature and it gets damp. As you mentioned washing off could be an option but I was wondering if there is an stronger way to technically justify the corrective action rather...
  2. Mad1974

    Pipeline external algae formation

    Hi, Working for a gas plant and our Inspection Team has been reporting in some piping systems an external condition described as "Mild external biological/algae formation on piping" (refer to attached file). Piping is Carbon Steal and externally coated. I am seeking your advice and guidance...
  3. Mad1974

    Air-Cooled heat exchanger thread damage

    Hi, For upcoming turnaround, internal inspection will be performed in some Air-Cooler heat exchangers and we want to be prepare in case of heat exchanger header thread damage is found. Repair methods like the ones describe below are suggested: - Oversize the hole and use and oversize plug...
  4. Mad1974

    Control valve stem

    Hi, We experienced a control valve packing external leak on gas service, after valve disassembly we found some damage on the stem surface. Crevice corrosion of the chrome plated 316 SS base material stem was identified as the damage mechanism. The damaged stem was replaced in kind and a visual...
  5. Mad1974

    Ring Joint hardness

    Hi, For a 2500# RTJ the specification request GASKET,RTJ,8IN,2500#,CS,OCTAGONAL,R51 (Low Carbon Steel) and we received GASKET,RTJ,8IN,2500#,SI/LCS,OCTAGONAL,R51 (Soft Iron, according with Materials Table; the hardness for Low Carbon Steel is 120 Brinel and for Soft Iron is 90 Brinel. I know...

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