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  1. NARL

    Stess Relief Of Carbon Steel Caustic Piping

    We are in the process of revising our plant standard for stress relieving carbon steel piping welds in caustic service. From NACE recommendations stress relief should be performed to minimize caustic SCC for concentrations of 5% and higher in operating temperatures of approximately 120°F and...
  2. NARL

    Refinery Vacuum Transfer Line Corrosion

    Thanks for the comments, I agree with the point regarding the use of the 405SS, it is a relatively low grade of stainless, however the line has a good service record. It was originally installed in the early 1970s, the plant was shut down for a number of years soon after, but has been in...
  3. NARL

    Effluent Cooler Heat Exchanger Material Selection

    The piping materials are as follows: Piping to/from the exchanger tube side (boiler feed water) is carbon steel SA106. On the Shell side (effluent) the pipe material is SA335 Grade P11.
  4. NARL

    Refinery Vacuum Transfer Line Corrosion

    While steaming out equipment during a maintenance shut down, we recently discovered a leak in our crude unit vacuum section transfer line. The line, which runs from the vacuum heater to the vacuum tower, is a 36” clad pipe. Materials for the base material is 1/2” thick ASTM A515 Grade 55...
  5. NARL

    Effluent Cooler Heat Exchanger Material Selection

    We are in the process of replacing the high temperature effluent coolers in our Hydrogen plant. The exchangers are shell and tube type and we are planning to change the material to address a problem with carbonic acid corrosion. The plan is to install new 321 stainless steel tube bundles in...
  6. NARL

    Materials For Sulfuric Acid Piping

    we are in the process of installing new sulfuric acid piping in our water treatment facility, and I would appreciate any guidance on material selection for the following applications. 1. Pure sulfuric acid up to the dilution point. 66 be sulfuric acid @ ambient temp. We are planning to use...

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