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  1. jchumley

    What does a PE stamp get you?

    Yes, we felt it was reasonable. He is a friendly engineer who we've worked with for years, so I guess we got the friend discount. I'll say that you guys have been great and I've learned a lot. Going forward, we'll pay the extra money for the "stamp" and I'll keep my wrong opinion to myself...
  2. jchumley

    What does a PE stamp get you?

    I'd like to address something that rbulsara brought up. I am not complaining about the total costs or even an additional fee. I think the costs are reasonable. My original question was this: We had already contracted and paid the PE for engineering services that he had provided back and...
  3. jchumley

    What does a PE stamp get you?

    Okay, so I appreciate all the feedback and comments. Just for everyone's information, the initial charge was $3000 and there was an additional $1500 for the stamp. Also, so we're all clear, the company did all of the design drawings using in house engineering. The comments from the PE review...
  4. jchumley

    What does a PE stamp get you?

    Okay, I'll answer a few questions. First, yes it was the same engineer who did the engineering calcs that ultimately provided the PE stamp. Second, my company was not listing him on any drawings, but there was official correspondence going back and forth between our company and the engineer...
  5. jchumley

    What does a PE stamp get you?

    My firm sold an industrial system with some heat exchangers, ladders, and platforms, along with the support structure that runs to the ground pads. We had an outside engineer, who is a PE review the designs. All drawings were provided to him in Autocad format. He made a number of required...
  6. jchumley

    C-1008 Carbon Steel - Hardened?

    Okay, so I now know a lot more and hopefully I can clear up some of the confusion. First, we were not using ASTM specs. The C1008 spec was an SAE/AISI spec. My understanding is that SAE and AISI share the # designation It turns out that when I went back through the old jobs that we were...
  7. jchumley

    C-1008 Carbon Steel - Hardened?

    Just as a clarification, further follow-up, the tubing vendor called me back and said that she was referring to A-1008 not C-1008. Can someone shed some light on the difference? Also, we're not manufacturing pressure vessels and 99% of the tubing we buy is welded tubing, not seamless tubing...
  8. jchumley

    C-1008 Carbon Steel - Hardened?

    I work for a manufacturer who builds low pressure (non-ASME) welded plate heat exchangers for gas-to-gas applications. We have a customer who has an abrasive application that we've been selling heat exchangers to for years. Somewhere along the way, a decision was made to change to C-1008...
  9. jchumley

    Aluminum exposed to Air with Citric Acid Fumes

    Forgot to mention that the standard grade of Aluminum we use is 1100 AL.
  10. jchumley

    Aluminum exposed to Air with Citric Acid Fumes

    Anyone know how Aluminum will do when exposed to citric acid fumes? I'm working on a project where we were using 304LSS or 316LSS and now it looks like we might have to go with Aluminum. The problem is the corrosiveness factor. I really don't know if either of the SS are good for citric acid...
  11. jchumley

    Corrosion Resistance of HR CS vs 304LSS vs 316LSS

    As you can see, I'm not a mechanical engineer. I would appreciate it if your responses are in as few non-technical terms as possible. I work for a firm that manufactures air-to-air heat exchangers (recuperators). These are basically welded plate or tubular type recuperators operating at...

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