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Recent content by csk62

  1. csk62

    What type of welding process should be avoided on a pressure vessel?

    Pressure vessels are a vast and diverse field spanning from tiddly-wink instrument air receivers to cryogenic propellant tanks and beyond. There is no one size fits all approach since technical requirements are vastly different for each application. Zeroth law, it must meet customer technical...
  2. csk62

    Cannabis Processing Barn- Ventilation

    Many of the new stringshoe, independent cannabis growing "barns" directly inject CO2 to promote faster growing conditions, in some cases at high enough ppm to cause potential adverse health effects, whether by displaced oxygen or co2 toxicity if someone were in the "barn". Is it a good idea for...
  3. csk62

    B31.3 Impact Testing @ -425F

    Basemetal, weldmetal, HAZ? ---------------------------------- Not making a decision is a decision in itself
  4. csk62

    How many hours a week do you work?

    20 hours of real work, 20 hours of engineer babysitting. ---------------------------------- Not making a decision is a decision in itself
  5. csk62

    Retirement ages for engineers

    I think there are too many people early in their career who need to retire from engineering and move into another field that suits them better. You know, the folks that create a net positive amount of work that are better served pursuing careers in sales. Most of the greybeard engineers I've...
  6. csk62

    Socket Weld and Corrosion Allowance in Wet CO2 Service

    Not necessarily directly applicable to your application, but CGA G-6.1 section 8.3 discusses the use of stainless socketweld fittings in "dry" CO2 service. In general if given the choice, and availability of a competent welder that will pass the 5%RT, I would go with BW fittings due to lower SIF...
  7. csk62

    ASME-U for LH2 strage tank

    For vermiculite, you are referring to perlite which was used with a lot of older cryo tank vacuum space designs. Almost all modern cryo tank designs use aluminized mylar MLI insulation instead as the net heat load is much less. ---------------------------------- Not making a decision is a...
  8. csk62

    ASME-U for LH2 strage tank

    I believe credit in ASME for cold stretching cannot be used when MDMT is below -320F, as the case is with LH2 tanks (-425F). I've seen some 150 and mostly 175 psig MAWP LH2 tanks in service. Obviously the tank operating pressure is much less than that under normal circumstances. Not only do...
  9. csk62

    Liquid CO2

    If you have no experience with liquid co2, you need to be very careful, there are some serious hazards that you may be unfamiliar with, such as ice blocking during system depressurization. The saturation temperature at 285 psig is about -1F, so at 20F you definitely have gas. If you are using a...
  10. csk62

    Future Outlooks/Options

    If you are a senior in college you should be making your own life decisions without consulting your parents or doing things to please your parents. You need to find a goal of where you want to be in 4 years. Then reverse engineer the path that will get you there. Having a plan is always better...
  11. csk62

    Anyone ever get tired of working from a home office?

    I get tired of not wasting 1.5 hours of my day in traffic and the money for a bi-weekly gas fill up. Not to mention the increased work efficiency and less time wasted by the water cooler creatures that insist I hear of the latest misadventures of their cats. Yes, working from home has been...
  12. csk62

    Vacuum insulated cryogenic vessel internal supports?

    First of all, you need to understand what design codes are applicable to your case DOT, ASME etc. If you have no experience with cryo tanks, I wouldn't recommend starting without fully understanding existing designs. It would be very easy not to plumb particular lines such as the diptube or...
  13. csk62

    ASME B31.3-2018 Section 319.4

    The flexibility and stress in a straight run of pipe between two anchor points is easily determined; why would you use this formula? In your case for a straight run with no displacement, if L and U are equal, y should be 0 and the equation becomes indeterminate. If you find you have...
  14. csk62

    PE Application - Experience Record

    Not familiar with Alabama in particular, but when I filled out my experience record I made sure to list each major project include the start and end dates and also made special mention if any applicable codes and/or standards used along with the "I designed X..." statements. Some states are...
  15. csk62

    Engineering deliverable requiring PE stamp in TX

    While these PE stamp requirements you listed may be applicable to civil/structural functions, there may also be additional PE stamp requirements for things like HVAC systems in hospitals and pressure vessel designs IAW asme section viii div2. My point is that without a scope listed all we know...
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