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  1. cdill21

    Am I at risk of a steam explosion?

    MJCronin, thank you for your recommendation. After some thorough diving through ASME BPVC, it suggests that there is no risk of a steam explosion (all water in the system will boil before the pressure vessel is at risk of cracking). The ultimate end to the uncontrolled heating failure mode is...
  2. cdill21

    Am I at risk of a steam explosion?

    Yes, that makes sense. I take back what I said about it being piped to vent water. As I understand it, there is a CSA rating and an ASME rating for the valve, where the CSA rating will only ever account for a 15 psi pressure drop(10% of 150psi, which most water heaters are rated for). For a...
  3. cdill21

    Am I at risk of a steam explosion?

    These units are sold across North America, but are used primarily in the United States. They are manufactured in Pennsylvania. The pressure relief valve is piped to vent water, not steam. The expected failure mode is the cooling water valve stuck shut with the heater contactors welded...
  4. cdill21

    Am I at risk of a steam explosion?

    MJCronin, the unit was designed by engineers at my company that left less than satisfactory documentation. It is sold with and without UL and cUL certification, but it appears to only concern the electrical enclosure. We do not change any mechanical components to achieve UL certification...
  5. cdill21

    Am I at risk of a steam explosion?

    The relief valve is set to 150 psi and the unit runs at about 135 psi and 250°F regularly. The tank has not gone through any rigorous ASME BPVC analysis. As far as I can tell, the maximum allowable pressure was calculated to be 700psi based on the hoop stress of the tank to yield and a SF of...
  6. cdill21

    Am I at risk of a steam explosion?

    EdStainless, we have not tested this particular failure mode. What tends to happen first is the welds that hold the heaters in crack from added thermal stress when an air or steam bubble builds up. This results in leaking water.
  7. cdill21

    Am I at risk of a steam explosion?

    Hello All, I am trying to see if I have a risk of a steam explosion. I have taken over a legacy product line which is effectively a small (0.5 ft^3) water heater on wheels for industrial use. In this particular unit, I have observed a 30,000 btu/hr electric heater in the system, with a 15,000...
  8. cdill21

    Improve my planning, time management etc.

    ..."deep work", "pomodoro", "getting things done". In short, plan your most important tasks, schedule them in your calendar, devote large, *uninterrupted* chunks of time to them, with short breaks (2-4 hours works, 5-10 minute breaks every hour or so). Batch many short tasks together in large...
  9. cdill21

    Research and locating hard to find information

    duckduckgo.com will give you a different set of results, though it may not be the set you are looking for. However, it sounds like what you really need to do is more research. What is the name of the journal you are looking for? What website was it posted on? What do you need to know about...
  10. cdill21

    Current Job Culture in Your Geographic Region

    In my experience, the region that you are in will have an impact on the culture, but won't define it. That is really going to be a combination of the industry you are in, the size of the company, and the sum total of the top managers that have come and gone. However, using Indiana as an...
  11. cdill21

    Bolts in tension + a load

    In the words of my favorite college professor: "A bolt is weak. A bolted connection is strong."
  12. cdill21

    Standard for rounded keys

    Greg, Isn't that the point though? If the key works, why spend the spend the money on splines? Chris
  13. cdill21

    Best Portable Air Compressor 2019

    The slime doesn't work if the sidewall is blown out. Then again neither will a pump. Cheapest solution is to keep the spare inflated properly. 2nd cheapest is to learn to find and repair a small leak in the tire with a $9 kit. I used to own one of these for the jump starter but the...
  14. cdill21

    Power Calculation of Hydraulic Rotators

    Startto, What model pump are you looking at?
  15. cdill21

    Standard for rounded keys

    You need to figure out what the key is doing there in the first place if it is not transmitting torque. Once you know what it is for, you can select the tolerance and fit you need. It sounds like you probably have done this with rectangular keys. What makes this any different? Judging from...
  16. cdill21

    Heat source location in 1D and 2D models - Conduction

    Syed, You can solve your 1D and 2D problems analytically. Open any heat transfer textbook and you will find examples of asymmetrical heating. For complex 3D models, you are going to have a heck of a time developing a method from scratch, in which case you probably want to solicit help from...
  17. cdill21

    Vacuum Leak Test - gauge and rate?

    Iceman, Pressurize it and spray it with soapy water, or Snoop if you want to be more controlled. We spent a long time trying to standardize a similar process. Moral of the story is that we rigidly controlled the upstream processes that contributed to the seal and only used a leak test for a...
  18. cdill21

    Smallest Radius in Stepped Shaft - Stress Concentration Factor

    Bewler, Maybe your professors didn't mention it, but your textbook probably did. In other news, whenever you have two surfaces come together you are always going to have a "gap", it just matters how large of a gap you are willing to tolerate. Usually you have to fill it with "stuff"...
  19. cdill21

    Smallest Radius in Stepped Shaft - Stress Concentration Factor

    My experience is that 0.005" is the "sharpest" you are going to get reliably on any mill or lathe tool. Any less than that, listen to Jboggs and rb1957 and use an undercut. What are you trying to accomplish with this tiny radius
  20. cdill21

    Slowly transitioning into management role - help with organization

    OP, I was in your exact position a few years ago. One of the best things I learned is that there will probably never be a perfect, written process for these projects and it is foolish to try to shoehorn one in. Setting up routines, however, is not. First, get a regular audience with the...

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