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  • Users: marthab
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  1. marthab

    Kitchen Exhaust fan duct sizing

    How do I size the duct for an exhaust fan with 1450 cfm and 1,324 rpm.
  2. marthab

    Demand load for a bakery

    For a bakery with 6 ovens with a total demand of 170 kVA can Table 220.56 NEC be used and factored this load by 65%? Thank you
  3. marthab

    Fees for Multiple repeat used of drawings

    We were asked to give a price for the design of storage sheds that will be used over and over and over again. What is the best way to price this for multiple repeat uses of the plans? Thanks
  4. marthab

    Hydraulic Grade Line Calcualtion

    I was asked to furnish hydraulic grade line calculations for a system of 4 pipes that go from CB to CB. I created a spreadsheet, but I am getting for my last 2 pipes (upstream) the E.G is lower than the invert of the pipe. Is that possible? Also, does anybody know of a spreadsheet that is...
  5. marthab

    SUBDIVISION DESIGN FEES PER LOT

    I'm trying to find out how much are engineering firms charging for subdivison design per lot. Includes preliminary plat and construction plans. Surveying fees will be extra. I'm in North Carolina. Thanks
  6. marthab

    Sewer line aerial crossing

    Is there a way to insulate a sanitary sewer pipe for an aerial crossing? The pipe is DIP, 8".
  7. marthab

    Bottomless arch culvert

    Where can I find information (literature) on the hydraulic design of a bottomless arch culvert? Is there any software available? Thanks for the help
  8. marthab

    Copulas

    We are designing an office building whose main structure is a metal building system. The owner wants a copula 5'x5'x5' with metal roof panels matching the building. The question is: Can the metal building manufacturer design the copula, or should we do it. The weight should be consider in...
  9. marthab

    slab on grade fire station

    We are designing a fire station. Is an 8" (4,000 psi) slab on grade enough for the bay area? What about reinforcement? I will appreciate answers ASAP. Thanks
  10. marthab

    Apron for pipe

    How do you design an apron for a pipe that is not flowing full. THe soil erosion manual figures assume pipe flowing full. Thanks
  11. marthab

    Lintel over 14' opening

    This is the case: Brick veneer wall on metal stud, over 14' garage opening. There is 6' brick veneer wall above opening. What is the best "lintel" for this situation? I did a load calculation and came up with a W12X40 to support the 6' brick above. There is a 24" between doors. Can I...
  12. marthab

    Brick veneer/metal stud

    Is there a height limit for a 4" inch brick veneer on metal stud (6" or 8")?
  13. marthab

    Light gauge joists framing into 1 hr fire rated wall

    I wonder if somebody could help me with this. WE are going to add 8" joists above a room to place the Air Handler there and create a working area for the HVAC people. The span of the joists is 8'. The wall at one end of the joists are 1hr fire rated. What is the best way to support the...
  14. marthab

    Lintel for brick veneer

    I need a lintel to support brick veneer to span 15'. The height of brick above the opening is 7' and the brick is backed with 6" steel studs. A 5 1/2 X 3 1/2" steel angle is not enough. Any suggestions?? Thank you for your help.
  15. marthab

    truss missing

    A client installed roof trusses @ 24" oc, but he skiped 2 trusses. So now he has 2 trusses spaced @ 48" oc The inspector won't accept that. The span is 28' and the roof pitch is 7/12. The roof is already installed. I was thinking of installing rafters and a tie beam, which will be...
  16. marthab

    Footing for metal buildings

    In designing foundations for "metal buildings" what is the best way to resist moments on fixed columns? Do hair pins help? It is an independent footing (no monolitic pour).

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