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  1. Teeboog

    High strength bolts

    I do a lot of vessel and heat exchanger rerates. Often, the flange bolts are the limiting component. I am currently looking at a TEMA flange that would be sufficient if I change the bolts. The problem: Bolts made of material such as SB 637 are not only hard to find, but they are very...
  2. Teeboog

    PSV Inspection Sch.

    Go to API 510 paragraph 4.5. The intervals are based on past performance. Two years are normal for new equipment without past performance records. The maximum interval is ten years. I don't know if API addresses redundant PSV's; however, I would certainly want to be sure that when I switched...
  3. Teeboog

    direct welding of CS A333 to CS A106

    GGH is correct. A106 Gr. B and A333 are one in the same. However,the difference is that A333 has been impact tested. I would not allow the substitution if you are operating a low temps.
  4. Teeboog

    Does Anybody Have Bolting problems ?

    Belleville washers are a good fix for flanged connections that thermal cycle. The washers are concave and provide spring tension on the stud to maintain the gasket seating force.
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