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  1. Heaviside1925

    UPS going to Bypass Mode instead of supplying through Batteries.

    cranky108 Bring up another possible reason. Your STS/UPS should have parameters it looks for when power is restored to determine if it's acceptable to retransfer.
  2. Heaviside1925

    How to resolve white rust issues inside ductwork?

    HVAC-Novice, Consider CW ~40F DB, CW reheat 55F - 55F 55%RH. It is typical to have reheat as part of a CW AHU for the exact reason you are noting. Some even have a second stage reheat. PagoMitch's past posting indicates a competent MEP, so I am taking face value when noting . Not sure that's at...
  3. Heaviside1925

    UPS going to Bypass Mode instead of supplying through Batteries.

    As LI noted, single line or circuit drawing would be helpful. Make and model of UPSs and STS if you want device specific information. A few thoughts. When you say , do you actually mean the UPS/STS switches to bypass mode? or do you mean it is bypassing the UPS? Bypass mode is typically a...
  4. Heaviside1925

    How to resolve white rust issues inside ductwork?

    HVAC-Novice What are you getting at? 55F @ 55%RH seem reasonable with a CW AHU.
  5. Heaviside1925

    Energy density of a 7-10.5 kW instant electric shower heating element

    adThp I meant no disrespect. It was the way your post, that was deleted, read, that thew me off. You indeed have been a member here much longer than I have. From a quick read of your 11 points you posted, you seem very knowledgeable in this subject matter. I fully agree with this for the most...
  6. Heaviside1925

    How to resolve white rust issues inside ductwork?

    I understand your concern with future corrosion, especially with a marine environment. My counter argument would be, how much more time are you truly adding to life expectancy of the ductwork? As far as remediation, I can't recall ever field applying a coating to the interior of ductwork in...
  7. Heaviside1925

    205 VDC vs 230 VAC coils

    Not sure if this will answer your question. https://www.insanehydraulics.com/letstalk/dccoils.html https://www.nord.com/media/documents/bw/u35000_motor_brakes.pdf
  8. Heaviside1925

    Residential Shear Wall

    I have concern with overall build quality. Why would the contractor use that piece and not discard it? Concerning fasteners, they look to be 6" spacing, but one fastener misses the stud completely and it appears (can't be sure because of the resolution) but the sheathing fasteners do not appear...
  9. Heaviside1925

    Insurance Coverage

    "Authority Having Jurisdiction" Local, county, state code enforcement agency. For me as an ME, when dealing with pressure vessel and such, it's typically a state agency. For a residential and business construction design and activities, it a local building code person/people/department, fire...
  10. Heaviside1925

    Insurance Coverage

    I should have not used the word inspection. I agree, they are not inspected in the engineering sense. I was saying that typically a local policy writer (non-engineer) comes out to create a description of the property and structures and if a building is obviously structural deficient, i.e. very...
  11. Heaviside1925

    Insurance Coverage

    To answer your question OP, yes, I have seen insurance cover these situations in my neck of the woods. I am assuming, rural farm type building. Consider the insurance company agreed to write this policy in the first place. There would have been an inspection and if the company felt a building...
  12. Heaviside1925

    Seeking Team Support to Overcome Gasket Replacement Challenges in Pipeline Valve Station

    I missed this. If you're in KSA, I think you could get a long way with evaporative cooling. Looks like 36 C and 9% humidity in Riyadh right now at 11pm. Working at night with just forced air water mist, I think you could down around 10 C which might be enough.
  13. Heaviside1925

    How to resolve white rust issues inside ductwork?

    1. Ignore it? I would think it will only get worse, and then (I assume) start flaking off into the airstream. As this is in a hospital, that would not be a good thing. I've had projects where this occurred, new and in retrofits. None of them were a hospital setting, so this thinking may be...
  14. Heaviside1925

    Liability insurance for structural engineer doing small side jobs

    Assuming you meant AR[wink] https://www.youtube.com/watch?v=dLECCmKnrys
  15. Heaviside1925

    Designing an atmospheric storage tank recirculation system - pump control strategies?

    To point to what bimr and pierreick are implying, it what you are doing is not uncommon. There are likely pre-engineered vendor options readily available. From a purely instrument and controls aspect, this thread has provided you with excellent options, especially georgeverghese. That said...
  16. Heaviside1925

    Seeking Team Support to Overcome Gasket Replacement Challenges in Pipeline Valve Station

    disclaimer.... zero pipeline experience (honestly a little but LI and 44 are much more exp). First agreement that cooling sounds like you best option. Secondly, I assume this delay is costing $$$$$ ever hour out of service on top of having a crew on site, do you have an alternated plan, if...
  17. Heaviside1925

    Energy density of a 7-10.5 kW instant electric shower heating element

    Also, zeusfaber Thank you for the clarification, I found the owner's manual online after I first posted, and it appears to function as you described. I forgot to give you credit for that earlier.
  18. Heaviside1925

    Energy density of a 7-10.5 kW instant electric shower heating element

    Brand new account and first post. Unless you know this person already, like any public forum, spam, trolls and posers... Some folks use a web link to a page with their contact information on it, but it doesn't appear that Jack Benson provided that, so I have no idea how adThp thinks they...
  19. Heaviside1925

    Liability insurance for structural engineer doing small side jobs

    I guess my first question is how risk averse are you? It doesn't sound like you are taking huge liabilities with the small job you mentioned but are you okay with paying out of pocket for a lawyer if you are sued? Assuming you are an Illinois licensed SE? Would these small jobs be stamped...
  20. Heaviside1925

    STC rating between apartment units.

    Try the calculator. I ran some numbers, and they seem reasonable. I am assuming you do not know the frequency range you are wanting to attenuate, which in a use specific application and would be important but for just general noise this should be adequate...

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