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  1. txdilbert

    Steam Main Drip Trap Discharge

    Any cost effective way to pipe a medium pressure steam trap discharge into a pumped condesate return line? Or are folks still just simply creating site leaching wells to handle this discharge?
  2. txdilbert

    Boiler Attendance Requirement?

    Boiler Experts, I have been involved in discussions about whether there is a national code or rule that requires building-level boilers above a certain heating input to be constantly supervised by a qualified on-site person, capable of responding to an alarm condition in a responsbile manner...
  3. txdilbert

    chilled water system tests

    Absolutely, you need to balance flow at each fan coil unit. Typically, all you'll need is a differential pressure gauge, and the knowledge that multiple trips around the loop will be required to get things set up correctly.
  4. txdilbert

    Toilet Exhaust thru an ERV with a rotating wheel??

    I've used an energy recovery wheel for toilet exhaust. I like the latent benefits of the wheel over the plate. I think the cross-flow leakage rate is like 5% or less - mix that with 95% outside air and your return air stream and I don't think you would detect anything. Ultimately, this is...
  5. txdilbert

    Structural engineer with question for mechanical engineer: rooftop equipment weights

    Yes, there is a difference. The net weight figure would not include fluid weight, but in this case you are dealing with refrigerant, which will be fairly negligible some of it will be gas and some of it will be liquid in the condenser. Use 550 lbs to make things simple.
  6. txdilbert

    heatload calc on windows

    You can do calcs based on the angles as you suggest, but for quicker results look in ASHRAE Fundamentals. I don't have access to it at the moment, but I believe there are tables in there that list expected btuh per square foot of glazing, based on the orientation of your window face (North...
  7. txdilbert

    what is the minimum permissible aileakage rate for low pressure HVAC system? please can anybody help

    You are allowed a certain percentage of leakage based on the pressure class and seal class of the ductwork in question. For example, seal class B ductwork allowable leakage rates are more stringent than seal class C. This info is in SMACNA, as mentioned above.
  8. txdilbert

    Pre-Eng Metal Building

    Guys, Have a customer that wants to erect an 80' x 60' x 20' pre-engineered metal building on an existing 100' x 100' monolithic concrete slab to control cost. Core samples suggest the slab was poured at 12" thick(?), with no reinforcement. Unclear what type of concrete mix was used. Since...
  9. txdilbert

    Boiler Hydrostatic Testing

    metengr, Thanks for your response. NDT probably would not be very cost effective in our situation. If pressure testing is the route we want to pursue, do you think 25% of MAWP is adequate to verify leak integrity? This pressure would likely be similar to operating pressure. I would think...
  10. txdilbert

    Boiler Hydrostatic Testing

    Guys, Looking for some direction on this. The organization I work for requires that boilers already in operation receive hydrostatic testing every year if steam or high temperature hot water. I have read conflicting information regarding the test pressure the boiler must be brought up to...
  11. txdilbert

    Dining facility HVAC

    Excellent. Thanks for the response. I have a much better idea about how I will approach this.
  12. txdilbert

    Dining facility HVAC

    Abby, When you say you would put the kitchen on its own system, you mean that you would provide a make-up air unit for the kitchen that would both heat and cool? The unit would have humidity control, correct? Humidistat mounted where? I've seen some kitchen MUAHUs designed for a minimum...
  13. txdilbert

    Dining facility HVAC

    Is it common practice to provide direct mechanical cooling for a kitchen area in a dining facility? Or, is kitchen worker comfort generally accomplished by air being transfered to the kitchen from the dining area because of the negative pressure in the kitchen? Would it be a bad idea to...
  14. txdilbert

    Redundancy with common duct system?

    What is the typical approach method we use when attempting to provide redundant floor-mounted indoor air handlers if only one duct system will fit in a space? Are they stacked and ducted together at the supply and return flanges? Do we provide duct-mounted motorized dampers to minimize the...
  15. txdilbert

    Humidity?

    Entry level question here.. Would humidity levels be a concern if the OA requirement is 10% of building supply air and the RTU is not oversized? (Assuming a constant OA requirement during occupancy and no reheat)

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