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  1. HowJoh

    UG-46 interpretation - 28" vessel

    Thanks for your comments bpv66. Where I'm running into trouble is that the fabricator is saying that any opening under UG-46(f)(7) has to be at least the same size has the minimum handhole size. They're interpreting the statement "in size of the required opening" to mean the handhole size...
  2. HowJoh

    UG-46 interpretation - 28" vessel

    Greetings all, I'm designing a small S/S vessel: 28" OD, toriconical bottom head, 17" SWL, and stands vertically. I wish to use the drain, which is a 2" Sch40S WN flange that has be welded into the lower head, as one of the two inspection openings. The other inspection opening is a flanged 4"...
  3. HowJoh

    Sulphuric Acid material selection

    Doug Louie's web site "Sulphuric Acid on the Web" has a materials section (www.sulphuric-acid.com/techmanual/materials/materials_metals.htm) which may be useful to you. Note there the factors that affect corrosion; slight variations in them can have a dramatic effect on the corrosion rate.
  4. HowJoh

    Required: foundry to supply casting & U-2 form

    Thanks UncleSyd, I'll check them both out. I very much appreciate your help and time. All the best, Howie
  5. HowJoh

    Required: foundry to supply casting & U-2 form

    Hi All, Has anyone knowledge of, or experience with, a North American foundry that can supply a one-off, custom, non-standard pressure part, complete with a Manufacturer's Partial Data Report or U-Stamp, for a SA-351 CF8M casting (~110 lbs)? The casting is to be a component of a registered...
  6. HowJoh

    CF8M - A351 vs A743

    The most significant difference is that A351 has tensile property, inspection, and quality requirements not found in A743. A351 references A703 which in turn sets out the testing & analysis methods and requirements. A743 references A781, a general specification for casting used in...
  7. HowJoh

    CF8M - A351 vs A743

    Thanks for the comments people, I appreciate your time and effort but is no one able to point to a specific, salient difference between the two standards with regards to this material? Maybe I'm missing something but it seems all the replies were rather general. The wet analysis and tensile...
  8. HowJoh

    CF8M - A351 vs A743

    Hi All, I've been supplied a casting for which the material certificate states that it is A743 CF8M but for my purposes I require A351. The foundry's wishes to send to me an revised certificate but I'm concerned that the standards are not equivalent to each other. I've only a copy of A351 and...
  9. HowJoh

    Nozzle reinforcement Div 2 head Div 1 vessel

    I'm designing a Div 1 vessel and for various reasons have had to design the heads per Div 2 under U-2(g) of Div. 1. My question is: Are there any reasons why I'd not be able to use the Div 1 area replacement reinforcement calculations for nozzles in these heads? Thanks, HJ
  10. HowJoh

    Pressurized shell - water tube boiler

    Thanks for your replies guys. The unit is to be between a thermal oxidizer and a process system which further treats the products of combustion. The pressure I've quoted is the overfire pressure caused by the balance of the plant after the boiler (WHSG). Howie
  11. HowJoh

    Pressurized shell - water tube boiler

    Hi All, Is anyone here familiar with a manufacturer that offers water tube boilers (~50 MW) which have been designed for furnace gas pressures of 0.5 bar(g) shell side? Thanks, Howie
  12. HowJoh

    Application of Seismic Loads to Saddle

    Stephen (lsthill) If you could post a link to, or a citation for, the paper "A Simple Solution to Cylindrical Pressure Vessels on Multiple Support Saddle" I would greatly appreciate it. Regards, Howie

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