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  • Users: dbill74
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  1. dbill74

    Cooling tower questions

    I have a number of cooling towers on the coast / beach like the image below. Most are more traditional with the fan on the top of the towers, but the fans are working and not my concern. My first question is what is the proper term for the circled area? Air flows into this side of the cooling...
  2. dbill74

    Magnetic Flow Meter anomalous reading

    Got a magnetic flow meter installed on a reverse osmosis (RO) system and getting the occasional spike/drop in flow reading. That is to say when looking at logs, we are seeing a reading where the flow rate doubles, then drops to about half the normal flow rate. There is no ramp up/down to these...
  3. dbill74

    Noryl Impeller in high pressure pump failure

    Currently in the midst of an investigation into the failure of a high pressure booster pump. Today I was finally able to eyes on broken impellers. The pump is scheduled to deliver filtered sea water into RO membranes pressure vessels. Pump details: Energy Recovery Inc. Model: HP-2403 3 stage...
  4. dbill74

    RO Cleaning Cycle, when to do it

    We've got a small seawater RO desalination plant (1.6 MGPD) with 6 "trains" (set of filters, RO memebranes, pumps, etc). A recently completed project replaced 4 of these trains. There is some confusion about when to initiate the cleaning cycle of an individual train. Reviewing the plans, it...
  5. dbill74

    Water Tower Inspection

    In the very near future I am going to be going to a unique location with limited access to survey a job site. While at this location I have been asked to look at a secondary project. This secondary project is a water tower that was taken out of service almost a decade ago due to "seismic...
  6. dbill74

    Condensate trap causing humidity issues?

    I am looking for some feedback on a situation and not sure I am being fed a load of BS. The problem is a recently completed ~3,000 SF 1-story office building experiencing high indoor RH (70%+) levels. Building is in Charleston, SC, USA. HVAC consists of 2 DX split heat pumps, OA is ducted...
  7. dbill74

    Phase Change Material PCM insulation application

    I am evaluating a proposal to supplement or replace a building's roof insulation with sheets of Phase Change Material (PCM). I have started researching these PCMs online to a point where I have a rudimentary knowledge of what PCMs are and how they work. My questions for the community here are...
  8. dbill74

    Trap Seal Primer Alternative

    I have run into a situation whereby I am concerned with protecting a tarp seal in a floor drain from drying out. Drain is in a computer room to collect CRAC unit condensate. CRAC units are scheduled with 0 latent load, actual calculations show 0.1 MBH latent load. First choice is to use a trap...
  9. dbill74

    Bleed air to airplane from ground source

    I have come into a problem in which I need help in understanding and identifying problems and situations to avoid. The problem: A military aircraft is to be parked in a new hanger and its pneumatic systems charged so crews can conduct training exercises in and on the plane. Normally the...
  10. dbill74

    Reheat on GSHP

    I have an existing dormitory building with rooms that open onto balconies in South Carolina, USA (near coast & humid environment). During a recent renovation, contractor was given a design to use through-wall PTAC room units with electric reheat. It was later decided have the contractor replace...
  11. dbill74

    Sloped Nonfixed Obstruction at Platform

    I am looking at a situation where I have a performance "platform" (NOT a stage) with sound deflectors that will be moveable in the vertical plane. The deflectors constructed so as to be at 2 angles, 12 degrees and 32 degrees, with no means of retaining heat from a fire...

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