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  1. PacificSteve

    Salt Water Pumping

    OK experts, here is a challenging one. I need to pump 1200GPM at 20 TDH saltwater at 70F, on a continuous basis. I am leaning towards a 316SS or Fiberglass type pump (at least until I hear from the pros). Main question -- can anyone hone me in a mnaufacturer that is likely to make a suitable...
  2. PacificSteve

    High Flow Low Head Saltwater Pump

    OK experts, here is a challenging one. I need to pump 1200GPM at 20 TDH saltwater at 70F, on a continuous basis. I am leaning towards a 316SS or Fiberglass type pump (at least until I hear from the pros). Main question -- can anyone hone me in a mnaufacturer that is likely to make a suitable...
  3. PacificSteve

    Sound pressure level for new ACCU

    I will sure appreciate any help that you expert can provide. Design challenge: new aircon system, using ACCU, to be lcoated about 4 feet from the property line. The adjacent building (2 feet away from equipment) will act as a reflecting wall. I have Octave band and "sound level&quot...
  4. PacificSteve

    Infiltration value for cooling load calculation

    I am looking for a simple answer to a non-simple question. My cooling load program requires an entry for CFM/SF for infiltration. Building in question is a corrugated steel siding, and visual inspection shows it to be not so tight. 0.1 CFM/SF, maybe higher? Thanks PacificSteve
  5. PacificSteve

    CHW and domestic water pumping in high rise

    I am working on a mechanical retrofit project of a 40 story building, mixed residential and commercial. Could anyone provide the 3 top items for the "issue list" that will be important in proper redeisgn of this tall building (350'). Intent of redesign is replacement of aging...
  6. PacificSteve

    Tall Building HVAC systems

    I am working on a redesign of the mechanical components of a 40 story building with about 150,000 SF of residential condo and 75,000SF commerical (food service) What are the 3 biggest pitfalls that I could run into, compared to standard HVAC and DHW issues on conventional large (but not tall)...
  7. PacificSteve

    Vibrational loosening, steel bolt in aluminum threads

    I have a lighting bracket which is cast of an aluminum. This has been tapped, the thickness is 3/8". The manufacturer uses a galvanized steel bolt. This bolt screws through the aluminum casting and engages a 2" steel pipe, thus holding the fixture in place (or so the theory goes)...
  8. PacificSteve

    Anchor bolt pullout strength in concrete

    For steel anchor bolts, embedded in concrete during the concrete pour (i.e. no epoxy), can anyone direct me to a table or simplified calc method. Interest is in 3/4" to 1" AB, various embedment between 12" and 96". Concrete can be assumed to be 3000PSI. My web search has...
  9. PacificSteve

    embedded anchor bolt design

    Are there any simple formulas for anchor bolt design. I need to resist 2670lbs of uplift on each of 2 anchor bolts, with the other side 2 bolts having 2670 pounds of downward pressure. Exist bolts are 15/16" diameter on threaded rod. Depth of embedment into 9' of embedded concrete is not...
  10. PacificSteve

    EPA and wind loading

    It has been far too long since my college days, and I have a new design issue that perhaps is an easy one. I am analyzing feasbility of placing new lighting fixtures on existing poles. The new fixtures will have a larger effective projected area, of 12.2 (including the brackets). These will...
  11. PacificSteve

    Solar System Multiple Tank Piping Schematic

    I have done a number of hot water systems including some solar, but have never found a good piping schematic reference for multi-tank systems. I am retrocommissioning a solar system that appears the basic panel and storage sizing is great to but 90% off the utility bill. However, both the...
  12. PacificSteve

    Steam Boiler Controller

    As an energy conservation measure, I am considering a controller to do some or all of the following functions. This is for control of a 3HP steam boiler (15PSI max) for a steam room. Currently boiler is controlled by pressuretrol, and steam is allowed into the room by manual operation of a...
  13. PacificSteve

    Piping selection for LPG

    I am providing a new piping run for LPG delivery at 10PSI to a new water heater. The run will be about 160' long, and it can either go underground or attached to a concrete wall. Underground has the inherent risk of unknown objects or other utility lines that could be hit. Can someone...
  14. PacificSteve

    Valves for LPG shutoff

    OK here is an easy one, I think. What type of valve should be used for LPG shutoff. Pressures are expected to be 10PSI on the "primary" and 10"WC on the secondary. I'll need valves in both locations. These valves would be located outdoors. Also does any know of any...
  15. PacificSteve

    Acoustics for dummies

    Hello all, I am looking for some help with some rule of thumb calc methods for a rough estimate of dBa at a distance from a source dBa. i.e. for lighting design, footcandles diminish with the distance squared. Issue I am working on, cooling tower producing 70dBa. What will the dBa be 200'...
  16. PacificSteve

    2 DX FCU from 1 ACCU

    Anyone have experience with serving multiple DX FCU with one ACCU? This is for cooling of 2 offices and 1 conference room. The conference room has limited hours of operation, and not at same time as offices in general, therefore, it would get its own mini-split system. The 2 offices are on...
  17. PacificSteve

    Municipal Water Pumping Efficiency

    I am trying to put together a list of benchmarks for various municipal water supply systems. The data would be # gallons of water delivered to customer per kWH consumed. I realize that leakage, well depth, storage tank elevation will have significant impact on this data, so additional comment...

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