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  1. PEinOHIO

    Anybody have experience with taking ICC plans examiner exams?

    I'd like to get a master plans examiners certification, from what I can tell if you go thru ICC for the testing, you need to pass a building, mechanical, plumbing, and electrical module to get the masters certification. just wondering if anybody has experience with this. thanks
  2. PEinOHIO

    Grease Waste pipe slope requirement for IPC 2009?

    I can't seem to find any reference to grease waste pipe slope requirements in IPC 2009, only for sanitary. Does IPC 2009 consider grease waste the same as sanitary? the grease interceptors section doesn't seem to address the issue either. thanks in advance
  3. PEinOHIO

    LEED Core and Shell, shell building has no hvac

    ok, thanks. that is our plan, we are drafting up a lease for the tenants to follow. i think the credits that specifically say we cannot get that credit if we don't have hvac on the core and shell are not possible for us to achieve
  4. PEinOHIO

    LEED Core and Shell, shell building has no hvac

    i'm new to these online LEED forms, our project is a retail shell building (strip center) with no hvac whatsoever, it is all on the tenant. it will be packaged RTUs. how do we, or can we, get certified if there is no hvac? several credits say we are not eligible for that credit since we have no...
  5. PEinOHIO

    Method for finding stroke speed in an air cylinder?

    i think it is different from hydraulics due to the compressibility of air. anybody have a reliable method to calculate the stroke speed? my bore cylinder is 14", air pressure is 100 psi. need to lift about 7000 lbs, up and down repeatedly in 6 seconds.
  6. PEinOHIO

    beam/plate in bending, is there a difference?

    if i have a plate in bending (simply supported, force applied at the center), 15ft long, 5 ft wide, 1 inch thick, can i use standard beam bending formulas or is there a correction factor if it is more of a plate then a beam?
  7. PEinOHIO

    psychrometrics question

    so hvac is not my area, something i was thinking about: so if water is under 212 F (boiling point) it is considered a subcooled liquid. however, that water can still evaporate into the air when its a subcooled liquid. does it evaporate only when its temp is above the dew point temp? i guess...
  8. PEinOHIO

    Bending stress in laminate beam

    you're right, shear doesn't change it much. i think i'll go with distortion energy theory, its giving some reasonable numbers,. thanks
  9. PEinOHIO

    Bending stress in laminate beam

    does it matter what theory is used? guess i'm not sure if i can just compare the bending stress to the yield stress, or if i need to use a method such as distortion energy theory which would include the shear stress too.
  10. PEinOHIO

    Bending stress in laminate beam

    i have a simply supported laminate beam (composite with steel on top and bottom) with a point load in the center. beam is about 4 ft long, point load about 400 lbs. i found a method for finding the max bending stress for each material in the beam in the Mech Eng Reference Manual for PE Exam...
  11. PEinOHIO

    Fourier heat trans equation problem

    yep, that is the same reference i found. i too thought the 4pi should have been 2pi, but i learned something haha. thanks for the help everyone! happy friday
  12. PEinOHIO

    Fourier heat trans equation problem

    'they' are the people's work i am checking, employees. the equation they have is correct, it is an equation used for a probe method of measuring thermal conductivity. the 4 pi has to do with boundary conditions. thanks
  13. PEinOHIO

    Fourier heat trans equation problem

    i'm checking some calculations, i can't figure out how they got the following equation from fouriers law: q = (4)(pi)(k)(delta T) / (ln(t1/t2)) for a long wire --------------- fouriers law is q = (k)(A)(delta T) / L are they using characteristic length instead of wire length? i'm not sure...
  14. PEinOHIO

    Friction head positive or negative?

    in my reference book (MERM book, page 18-6), they are analyzing a pipe system and show the friciton head on the suction side of a pump as negative (this makes sense to me, since the friction is taking some of the head away from the fluid). but on the discharge side, they show the friction head...

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