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Recent content by Pipeline1972

  1. Pipeline1972

    FluidFlow3 software comparison

    Something else you may want to keep in mind is, can you link the software, i.e. fluidflow, with microsoft excel? It is very helpful to be able to export data, e.g. calculation results, to an excel table, and even more helpful to be able to tweak the data in excel and import it back to the model...
  2. Pipeline1972

    Silane Thermal Barrier calculation

    Hello all, I'm hoping someone would we willing to help me out with the following calculation: I need to calculate the heat transfer through a "barrier" that is used to mitigate a possible silane jet fire. The barrier consists of two layers of expanded galvanized metal that forms a convoluted...
  3. Pipeline1972

    Average salary for engineer in Bay Area

    $29,999 to live in the fog? That's a lot! ;-) Process - Piping ing - EiT
  4. Pipeline1972

    Average salary for engineer in Bay Area

    eh, I can't afford to live in SF. The only place I can afford to rent an appartment is in Oakland, and that's not in the hills of Oakland! Thanks Hoagie! Process - Piping ing - EiT
  5. Pipeline1972

    Average salary for engineer in Bay Area

    @ Controlnovice: I was just asking a question. I'm not thinking I'm making enough, or not. I don't know. I'm fairly new in this country and don't really know fellow engineers except those at work and they're all seniors.Besides, nobody here talks about his or her salary. All those surveys and...
  6. Pipeline1972

    Average salary for engineer in Bay Area

    Hi all, Recently I've been doing some research on what the average salary would be for someone like me in the Bay Area. I'm a U.S. resident with a foreign degree equivalent to BS Me. I worked some years prior to my move to the U.S., but for this exercise I'm not even counting these years. So...
  7. Pipeline1972

    Deflection in double contained pipe - PFAxPVC

    Never mind, it was easier than I thought at first. Anyway I can delete this thread? Process - Piping ing - EiT
  8. Pipeline1972

    Deflection in double contained pipe - PFAxPVC

    By the way, how does one calculate the deflection in a full pipe? In the formula for deflection, 5.W.L^4/(384.E.I), what's E, what's I? In this case PFA tubing containing 96% H2SO4. Process - Piping ing - EiT
  9. Pipeline1972

    Deflection in double contained pipe - PFAxPVC

    Hello all, I need to calculate the deflection in a PFA pipe with double containment in PVC. I also need the stress on the PVC containment, assuming zero stresses on the PFA tubing. I can calculate the deflection of one pipe, based on single span beam, but, since we're dealing with "double"...
  10. Pipeline1972

    Mixtures - LEL, LC, LD...

    Hello, How can one estimate the Lethal Concentration of a mixture, for example: 5% Diborane in Nitrogen (5%B2H6/N2) For the explosive limits (LEL,...), I understand i need to use Le Chatelier's principle: reciprocal of the sum of the mole fraction / LEL proportion. Can I use the same...
  11. Pipeline1972

    roughness data for pipe

    oops, epsilon for galva iron is .15 mm, not .12 Process - Piping ing - EiT
  12. Pipeline1972

    roughness data for pipe

    ok 1.8E-3 for ss. I'll use that one. The value i found in the engineering toolbox got me confused. Can we assume the value for galvanized iron to be close enough to that for galvanized steel? @racookpe: ours are pipes to be used in clean environment (semicon, photovoltaic). They're not...
  13. Pipeline1972

    roughness data for pipe

    hello everyone, i'm working on a list of pipe materials for which i need to find the roughness values, for use in a pressure loss calculator. I've done quite some research, including here, and i was surprised to see that: A. It's hard to find that kind of info B. Values are different, depending...
  14. Pipeline1972

    use of air for valve activation in solvent room

    Hi Stookeyfpe, Pumps are used in solvent dispense modules, and yes the rooms, and modules are ventilated. Concern with using air: possibility of mixture of air with flammable liquids, in case of diaphragm leaks. One major semiconductor manufacturer uses nitrogen to avoid this. We are...
  15. Pipeline1972

    use of air for valve activation in solvent room

    sorry, i don't know why i wrote "valve". I meant diaphragm pumps.... But your comment is helpful anyway! Thanks! Process - Piping ing - EiT
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