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  1. radaes

    European Equivalents to SA 53 & SA 105

    Thanks for all the info, people [OT] I didn't know that the alt-codes worked in the forum, but I usually don't bother with them anyway. I use keyboard shortcuts when I'm typing a document and usually just go with equivalent vowel-combos where the shortcut doesn't work. I was just wondering if...
  2. radaes

    European Equivalents to SA 53 & SA 105

    @jte: I wasn't saying that they are exotic, I was saying that I have no problems substituting for a material that is easier to get. @mgas: I don't have a copy of a Stahlschluessel (how do you write umlauts in-forum anyway?) and my local library is sadly deficient in this department. So I may...
  3. radaes

    European Equivalents to SA 53 & SA 105

    We're trying to get some valves manufactured in Germany, but our drawings have a material spec for SA 53 and SA 105 and that doesn't mean anything to our German machinist. Anyone have the equivalent material numbers for Germany? As far as I've been able to tell, SA 53-A seamless is Material...
  4. radaes

    Office HVAC requirements

    Thanks to everyone who has responded. @engineer6512: the issue was that we expanded our office and our contractor was saying that the existing system was not sufficient to condition the new spaces, citing some random standard (turns out that he was just trying to get the job of replacing the ac...
  5. radaes

    Office HVAC requirements

    @GMcD - we're located in the US, so ASHRAE standards would apply. (Is there anyone else that would apply in the US? OSHA or something along those lines?) @CinciMace - I wasn't saying, "There must be a standard that says 'all HVAC systems in offices must have a capacity of <specific number>'" -...
  6. radaes

    Office HVAC requirements

    The system works fine - I just got curious as to what the actual standards are, since anything the contractor tells me to be "compliant per ANSI 2000" is suspect. cheers, rad "According to my calculations the problem doesn't exist."
  7. radaes

    Office HVAC requirements

    Hi, I'm trying to find the appropriate standard that specifies requirements for office HVAC capacities. Our contractor tried to tell me that our system is "compliant per ANSI 2000" and that strikes me as suspect, since I don't think I've ever seen an ANSI standard in that format. Plus...
  8. radaes

    Looking for heatexchanger w/ connecting pipes

    @rjw57 - lol. yeah, like I said in the first post, that's who we're using at the moment. I was just wondering if there was anyone else out there that made a comparable product. cheers, rad "According to my calculations the problem doesn't exist."
  9. radaes

    Looking for heatexchanger w/ connecting pipes

    @mike: I'm bummed, Dean Products is no longer in business. Any idea what happened to their inventory? was the company sold to somebody, or did they go broke? cheers, rad "According to my calculations the problem doesn't exist."
  10. radaes

    Looking for heatexchanger w/ connecting pipes

    thanks for the input, everybody @mike: sounds like exactly what I'm looking for (from the example I found online). I'll give them a call today. thanks :) @rmw: Dimple plate sounds interesting, but you're right, it doesn't look like there is a controlled (or controllable) path defined. I want to...
  11. radaes

    Looking for heatexchanger w/ connecting pipes

    OK, not the most accurate or descriptive subject line ever, so here are the details: We're using a Platecoil HXer manufactured by Tranter PHE in TX, and I want to know if there are any other companies anywhere that make something similar. The HXer is basically a single serpentine tube with...
  12. radaes

    Exhaust stack sizing

    AEBuck, you get a star - that's more detailed info than I was hoping for. Thanks! rogzog - the enclosure is located outside, so I think air supply is taken care of :) thanks for everyone's help on this cheers, rad "Remember, if you leave it to the last minute, it'll only take a minute"
  13. radaes

    Exhaust stack sizing

    AEBuck, yes, it's supposed to be natural draft. I'm trying to avoid having to include a draft inducer (staying outside-power independent). I'm using IR heaters on a vertical heat exchanger, with a smaller HX placed horizontally above to scavenge some of the waste heat (both from the exhaust...
  14. radaes

    Exhaust stack sizing

    Just wondering if there is a standard rule of thumb for sizing the diameter of an exhaust stack (something along the lines of "for every X cubic feet/hr, increase diameter Y inches"). I'm trying to vent a small enclosure (on the order of 4x4x4) of exhaust gasses and want to make sure there's a...
  15. radaes

    Air Entrainment into a Venturi

    (this is a cross-post from Gas Compression Engineering) This is basically part 2 of a previous project: a vapor stream is directed into the mouth of a venturi, which entrains air into the stream, resulting in a mixture. My problem comes from the fact that I don't understand the pressure...
  16. radaes

    Exit Conditions of a Vapor Stream though a Nozzle

    I know for a fact that the mixing takes place, and I know that the explanation for the mixing is that Pexit is lower than Pair, which sets up a vacuum that "pulls" the air into the vapor stream; therefore, I am very comfortable with saying that Pexit is less than 1atm. On a different note: I'm...
  17. radaes

    Exit Conditions of a Vapor Stream though a Nozzle

    well, c=sqrt(k*R*T), for propane k~1.1, R~189, T~330 --> c~262 m/s, which gives me a M=1.04... taking into account that this entire model is "more or less", most of my numbers are "close enough", which pretty much means chocked flow @ the throat already The vapor is supposed to exit the nozzle...
  18. radaes

    Exit Conditions of a Vapor Stream though a Nozzle

    point 1 to throat ~2.4cm, throat to exit ~.5cm are you going to tell me that the distances are too short for fully developed flow? cheers, rad
  19. radaes

    Exit Conditions of a Vapor Stream though a Nozzle

    You're right, that may have been (aka "was) a stupid statement... i was thinking "high velocity" and somehow that morphed into "high pressure" when i wrote the post... :~/ anyway: propane vapor is my fluid p1=240 kPa t1=330 K my handy property calculator spits out rho=3.9667.. call it 4.0 kg/m^3...
  20. radaes

    Exit Conditions of a Vapor Stream though a Nozzle

    Hi, I'm trying to calculate the exit conditions of a high-pressure LPG nozzle. I have the dimensions (interior @ state 1 and exit) of the nozzle and the initial conditions of the vapor (P1, T1), as well as the mass flow rate (mdot). P1 & T1 will give me density (rho) since mdot=rho*A*V, i can...

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