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  • Users: benensky
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  1. benensky

    basic dimensioning of holes, c'bores & c'sinks per ISO standard

    I am new to ISO drawing and have a question on dimensioning holes. What standard do you use? Granted I could purchase the, "ISO Standards Handbook - Technical drawings" but it is expensive and has standards I will not use and do not need. I am asking for guidance on the ones I will use. I...
  2. benensky

    Greasing of Packing

    Is it legal to grease packing before testing a valve? API 598 (section 4.4.1) infers that the packing should not be greased because it is a "sealing surface." Also, MSSP-61 (4.1.2) also says that seat surfaces should be clean. It could be inferred that the packing should also be clean because...
  3. benensky

    Iso dimensioning of holes and shafts

    Hi, I am new to this forum. Hope you can help me. We were bought by a European company and I work with ISO drawings at times and they tolerance there shafts 10 -2/-4. I have never seen double negative dimensioning. In the USA I was taught that if the fit of a 10unit shaft is -2 to -4 to...
  4. benensky

    Finding Stress in a Round Flat Plate

    I am doing stress calculation on a round flat plate welded to the end of a pipe. So I looked in "Roark's Formulas for Stress & Strain" 6th Edition. I went to chapter 10 “Flat Plates” and checked the examples. In example one (1) they found the largest moment and then plugged that into the...

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