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  1. martindup

    Origins Of Mechanical Engineering

    It can also then be said that mechanical engineering originated from argiculture - Egiptians build roped buckets to get water from the nile long before the Romans and Greek people moved out of the caves. The diffrence between civil and mechanical engineers? Mechanical engineers design and build...
  2. martindup

    Material Bridging Problem...

    Bluenosser337, All the above suggestions could be correct. Also available is air cannons. Air is blown in short bursts at pressure (6 bar or so) onto the specific area of the hopper where the bridging starts. For this you can also install a air-lance or sword into the corners of the square...
  3. martindup

    Hi I am gonna use Fluent software

    Hi faramarzi57 Well, the people who would tell you that another code would be better than Fluent for what you want to do, usually just want to sell you something. Maybe Fluent isn't the best in a field, but it will still do the job sufficiently. From my experience with Fluent, if you have the...
  4. martindup

    Oblique jet exit

    SparWeb, Your problem sounds like something I studied in post grad flow dynamics. It is all a haze but this is what I remember. It was about the effects of a nozzle spraying fluid tangently into static fluid. It was solved using the Navier-Stokes relations. Theoreticly if you were to ease down...
  5. martindup

    Y Strainers

    I would say the best would be to choose a perforation that would catch the trash in your fluid that would cause problems for your equipment. Have a look at the typical size of these mills slag and weld beads found in your piping. And then at what size of particles your equipment can handle. If...
  6. martindup

    6"x2" reducer

    wickedpete Yes 6"x2" must still be available, and I have seen them mostly for firewater applications as you mentioned, with threaded ends. Newly installed, so they must be available somewhere. Call and shop around for them at different suppliers. Some manufacturers do make...
  7. martindup

    Mass Flow Rate

    homerphish Are you talking about a number of pipes running into a single pipe and a single pipe splitting into a number of pipes? Then unless you found some cheap way of transforming matter to energy and back you should take the sum of the mass flows of all the pipes that run into a single pipe...
  8. martindup

    Protction from Sun rays

    Dear kmpillai On the use of different colours and its properties to pure radiation heat transfer it all comes down to the emmitance number. Black objects would absorb radiational heat very quickly. Black objects would also emmit heat better. Where white and silver objects would not absorb so...
  9. martindup

    Protction from Sun rays

    Not so much the colour of the umbrella but the material should not let UV rays through. Different materials let UV rays through at diffrent quantities. If you were to go to colours you want something that will reflect the bulk of the harful rays like the UV's, my guess would be that a reflective...
  10. martindup

    Orifice plate sizing

    hosec, please consult the NFPA on this. I recall something about orifice plates not being allowed at all in firewater distribution pipelines in some applications. I don't know in what NFPA standard I saw it because I was going through the standards looking for something else. charrid, I can...
  11. martindup

    I get the feeling in this forum tha

    The PBMR company website is the best bet. It is https://www.pbmr.com - do remember the 's' after http, it is a secure site.
  12. martindup

    Ammonia Fridge Fire System

    Good day all Hope someone can help me with the following. I am looking for the do's and don'ts or general tips on the design of a fire suppression system for a fridge plant using ammonia. I looked at NFPA codes and couldn't find anything about the use of water spray systems in such cases. I know...

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