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  • Users: mitcham
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  1. mitcham

    Duct Insulation

    Is it normal to externally insulate(thermally)a duct which is internally acoustic lined? Is it common practice to acoustic line round ducts?
  2. mitcham

    Water demand summary sheet

    I am working in an HVAC/plumbing consulting firm. The question is if there is a summery sheet available for building water demand per NFPA for various scenarios based on building size (number of system risers), occupancy, type of fire suppression system (wet/dry), building fully sprinklered or...
  3. mitcham

    Plumbing related inquiry

    Hi Guys: If I want to size DCW for an office building with 10 water closets with flash tank and two urinals with flash valve what would be the criteria for pipe sizing? Should I go all the way down to meter considering a system with flush valves and corresponding oversized pipes or I need only...
  4. mitcham

    NFPA 13D 1999

    Currently I am working on a one family 4-story dwelling project. The design has to comply with 13D 1999. I only have 13D 1996 handy. Are these two any different in terms of residential sprinkler spacing and locations. Can you please highlight the differences? Regards
  5. mitcham

    Soil/Waste Stack Offset in HR Buildings

    Hi Although this forum is dedicated to HVAC and Refrigeration, however, I think all who are involved in design of building mechancial systems, including plumbing, cross here. So I dare to post my inquiry here. Have you ever heard or seen of any requirement (as per code or good engineering...
  6. mitcham

    [b]Permissible Motor Cycle[/b]

    Hi I am sizing a pressure tank for domestic cold water supply system in a multi-story building. I have come to the point that I need to decide what should be the maximum permissible booster pump motor cycle for a safe and long lasting operation. whould you please give me an advice or a rule of...
  7. mitcham

    needs help with runtime error

    Hi I just installed a demo version of lisa finite element analysing software which is a vb based program. as per developer's instructions before installing the core program I installed 3 runtime files in order (vb40032a, vb500a, vb500b). Now, whenever I launch the program I get "rutime error 7...
  8. mitcham

    WHAT IS THE BEST RASTER TO VECTOR CONVERTOR?

    HI. IN OUR COMPANY I HAVE BEEN ASKED TO FIND OUT ABOUT THE BEST AVAILABEL RASTER TO VECTOR PRODUCT AVAILABEL IN MARKET, SO A PURCHSE DECISION CAN BE MADE. WOULD ANYONE PLEASE GIVE COMMENTS ON THIS ISSUE. YOUR KNOWLEDGABLE COMMENTS WILL HELP ME NARROW DOWN MY CHOICES. THANK YOU ALL IN ADVANCE.
  9. mitcham

    SWIMMING POOL MECHANICAL DESIGNING?

    HI FRIENDS. I AM A MECHANICAL ENGINEER FROM GREECE. I STARTED A JOB IN A CONSULTING FIRM LAST MONTH. I HAVE TOLD MY BOSS I AM FAMILIAR WITH DESIGING RECREATIONAL FACILITIES BEFORE. I THINK MY BOSS IS BIDDING FOR DESIGN OF A PUBLIC SWIMMING POOL. I WILL THANK YOU IF YOU CAN GIVE ME INFORMATION I...
  10. mitcham

    VAV and Dual-Duct system calculations

    Could anyone give me some clues and rule of tumbs for VAV and Dual-duct hvac system design? Can you please specify where can I find comprehensive calculation details of how sizing cold and hot air ducts and selecting appropriate units for commercial and school applicatios using these type of...

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