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  1. ehbadger

    BASF Explosion in Germany

    http://www.reuters.com/article/us-basf-blast-fire-idUSKBN12H12R
  2. ehbadger

    Help me get these studs out

    I have some reactors in a corrosive service. Heads are 30" 300# flanges. They were installed with studs. See attached photos The corrosion between the stud shaft and flange itself locks it up tighter than whatever you can think of that is really damn tight. We can get both nuts to break free...
  3. ehbadger

    Any experiences in sealing for large diameter body flange (>8ft) in a fluoropolymer lined vessel

    Hi All I am researching a new design for a separator in acid service (rules out 100% metallic construction) and am looking for some industry experience... Background: - horizontal tank - about 8ft diameter, 15ft long - body flanged at one head (full tank diameter) - there is a large baffle...
  4. ehbadger

    De-Rating Vessel; How do I handle Vacuum rating?

    I've got a ASME SectVIII DivI pressure vessel with some CUI. Overall wall thickness inspections have determined we need to derate from 50psi MAWP to 40psi MAWP. Generally for a derate we just change the rupture discs and relief valve settings to the new lower pressure. However for this vessel...
  5. ehbadger

    Natural Rubber Lined Tank Inspections

    Hi, I am x-posting this from the storage tank engineering section as I have not received any responses there in the last week. I can delete that thread if I get some activity here. http://www.eng-tips.com/viewthread.cfm?qid=405624 ________________________ From that post: Hi All, I've got...
  6. ehbadger

    Natural Rubber Acid Tank Minimum Concentration

    Hi All, I've got a few rubber lined storage tanks in aqueous HCl service (~32-36%) at ambient pressure/temp. In reviewing some PM requirements, I came across some notes about maintaining a minimum acid concentration to protect the rubber. Liner is PG-70 natural rubber. Problem: Low...
  7. ehbadger

    Pending Disaster? Mosul Dam, Iraq

    http://www.theguardian.com/world/2016/mar/02/mosul-dam-engineers-warn-it-could-fail-at-any-time-killing-1m-people "Iraqi engineers involved in building the Mosul dam 30 years ago have warned that the risk of its imminent collapse and the consequent death toll could be even worse than reported."
  8. ehbadger

    Gasketing Practices: Ring vs Full Face Gasket

    Hi all, I've got three main questions I am curious about. All are more specific to 'non-metallic' gaskets (Examples being Sigma 533, GYLON 3510, GORE UPG) but I am open to other responses as well. Most of my experience is 150# to 300# service, raised face flanges, <350F temps. 1) Where you have...
  9. ehbadger

    ASME B31.3 vs Sec VIII Div I Weld

    This question is related to this one here (I can delete that one if this violates the crosspost rules, I have a slightly different question now so I am leaving them both for the moment) Link Anyway, short and sweet review. Getting some tantalum lined pipe made. Its 18" DIA, 150# flanges, etc...
  10. ehbadger

    Are full penetration welds required on a double mitered elbow under B31.3?

    I've hit a small snag in one of my current projects. I am fairly certain this project falls under B31.3 as process piping in a chemical plant in a code state (KY). A manufacturer is fabricating some tantalum lined steel pipe for me. One of the parts is a double-mitered elbow. Category D fluid...
  11. ehbadger

    Sulfamic acid cleaning of Hastelloy C-2000?

    Does anyone have experience with using sulfamic acid to clean C-2000 equipment? I've found literature for C-276 in 10% sulfamic (0.002 mils/yr) but nothing for C-2000. My main concerns stems from the Copper in C-2000. Our contractor acid cleaners use sulfamic but have a note in their...

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