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  • Users: Hajiwaji
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  1. Hajiwaji

    Does N06040 Casting for Valve Body Require NACE MR 0103 Qualification in Sour Caustic Environment?

    For caustic environment containing H2S and meet the definition of sour as per NACE MR 0103, does require testing and qualification for ssc? N06040 is not listed in NACE MR 0103 section 14.
  2. Hajiwaji

    Leaving The Girth Weld Uncoated in Sour Gas Pipeline

    Dears The pipeline will have sour gas with H2S and CO2 with little to no water phase. The predicted corrosion rate is small and can be controlled with corrosion inhibitor and scraping with bare CS. Curranty, internally FBE coated pipes are readily available. Is it acceptable not to fix coating...
  3. Hajiwaji

    Inhabited Pitting Rate

    Dears, Is corrosion inhibitors effective against pitting cased by H2S and CO2 for gas flowlines? The salt content is very low, so the line has low risk of scaling and under deposit corrosion. The ECE model gives around 20 MPY of maximum pitting rate and less than 1 MPY for general corrosion...
  4. Hajiwaji

    Partially Cladding Liquid Seal Drum for Flare Gas Recovery System

    Dears, Is it a sound engineering practice to only clad the water containing part of a liquid seal drum in sour service. Won't this create galvanic corrosion in the interface between the cladded portion and the bare CS portion? Thank you
  5. Hajiwaji

    Risk of Galvanic Corrosion When Welding Dissimilar Metals in Crude Line

    Dears, I have wet sour crude line with about 30% water cut and over 100000 ppm of NaCl. The header is CS with internal FBE coating. For small bore piping smaller than 2" (branches, vents and drains) Alloy 625 is selected. Is is possible to directly weld these dissimilar metals without risk...
  6. Hajiwaji

    ECE High Pitting Rate

    Dears, I have a question about possible mitigations and corrosion control for this steam I modeled on ECE. A 4" pipe is used to transport sour gas from HP compressor discharge KO drum (Dry Gas) to a water well to left water to a degassing vessel. Is it possible to use CS with 3.2 mm corrosion...

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