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  1. josephn16

    Force exerted by an ID mandrel

    I hope I can explain this situation well enough, because it is a bit difficult to explain without a drawing: A co-worker of mine is doing a study of a possible interference fit for a product we make that is essentially a ceramic tube with a steel mandrel on the inside. The whole assembly goes...
  2. josephn16

    Tunnel oven gas pressure.

    From what I can get from your explanation, is seems like the set-up is correct. What I do not understand is if the hi-limit is only tripped when the safety valve is shut, then where is the problem? It's impossible to start the kiln with the safety valve shut, anyway. If your only question...
  3. josephn16

    Instrument Validation

    Hi all, Here's my situation: I have to measure the density of a liquid in my process. The specification is 1525 g/L +/- 2.5 g/L. The instrument that I have been given to measure the density reads from 1500-1600 g/L, in increments of 2 g/L. I do not feel that the instrument is the right...
  4. josephn16

    Chemical Cleaning of S444

    My guess is you will be OK, but you may want to post this in the Metal and Metallurgy forum. I can tell you this: Nitric acid is used for a process called "passivation" that is supposed to restore SS to the passive state and stop corrosion. I'm not so sure about the process, we have had only...
  5. josephn16

    LPG to Oxygen ratio for combustion

    I will try to give a partial answer, because I am not sure if LPG means low pressure gas, or something different. If you are using natural gas, the ratio should be around 2:1, O2 to gas, but I am only basing that on the fact that the ratio is 10:1 will standard air, and there is around 5x the...
  6. josephn16

    di plants

    What IRstuff said is true. It is difficult for most people to see any type of water as a corrosive substance, but DI water can be extremely corrosive in the right environment. I belive quark is talking about a situation that is different from the one you are experiencing. It sounds like you...
  7. josephn16

    "Discoloration" in high purity Al2O3

    Positive, we make both.
  8. josephn16

    Temperature Drop across pipe

    There will certainly be a temperature drop, especially if the pipe is not insulated. If you need to maintain the 280F, you will have to insulate and add heat tracing. Of course I don't know the system and the chemistry may not allow this, but you could calculate the temperature drop and...
  9. josephn16

    Recommended sites for SPC information + software

    amorrison4, Try this link: http://www.itl.nist.gov/div898/handbook/ Excellent handbook.
  10. josephn16

    Cleaning of pipes

    blegaz, I recently had this same problem, and there are much safer chemicals on the market now. I don't want to recommend any, because I have very little experience, but if you contact your O2 supplier for a recommendation on how to clean for your application, they will help. Be careful...
  11. josephn16

    relief valves

    roker, I'm not sure of your application, but, normally, if there is a danger of heat and/or gas from a relief valve, the practice is to vent to the outside or to the stack (in the case of a furnace).
  12. josephn16

    "Discoloration" in high purity Al2O3

    I am having some troubles with white spots showing up on high purity Al2O3 that is normally an ivory color. The assumption has been that the atmosphere in the kiln is causing the "discoloration", but I have been unable to prove any significant atmosphere differences. Other theories include...
  13. josephn16

    Process Monitoring guide line

    madhavank007, I don't know much about your process, but the best advice I can give is: 1. Do not measure anything that you are not using. You will find yourself fixing tranmitters and meters that collect data that does nothing but sit in a spreadsheet somewhere. 2. Do not set your specs...
  14. josephn16

    Combustion Information

    Does anyone know I good combustion text, or better yet a seminar or course somewhere that focuses on ceramics?
  15. josephn16

    Temp change through a wall

    I am using fused silica 3 inches thick. Temp on the inside is 1200F. Thermal conductivity is 0.6 W/m K.
  16. josephn16

    Temp change through a wall

    Thanks for all the answers, but I have no idea what Q or the heat transfer coefficient are. This was a question from a customer, wanting to possibly replace one of our materials with another, so I have no way of finding out heat flux. I thought I remembered something using a lot of assumptions...
  17. josephn16

    Temp change through a wall

    That's what I thought, thanks.
  18. josephn16

    Temp change through a wall

    Help please, I am a ChemE, and I know I should remember this, but i guess it's just been too long. I have a known temperature on one side of a wall of known thickness and thermal conductivity. How do I calculate the temp on the outside of the wall?
  19. josephn16

    citric acid question

    Yes, that helps, thanks. I never even noticed that there were too many C atoms, but I just checked the spec, and that's exactly what is says. I only started here recently, so I didn't write the specs for any of the chemicals, looks like they could use a once-over.
  20. josephn16

    citric acid question

    Basic question on citric acid. I am a ChemE, but working in ceramics industry, so I am the "chemical expert" in the plant, but I am having a hard time figuring this one out. I have a specification for buying Citric Acid and it reads: "C8H8O7 (on anhydrous basis)...

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