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Recent content by FacEngrPE

  1. FacEngrPE

    Two 250 VDC 1200A rectifiers feeding multiple crane rails - is it OK to put the outputs in parallel ?

    The vendors statement is most likely literally correct. Do not expect the rectifiers to share load equally. The arrangement may be OK if the goal is automatic load shifting between rectifiers on loss of supply, or disconnection of a rectifier. Load shifting does not require load sharing, so...
  2. FacEngrPE

    FDC Sign Design Ordinance?

    See NFPA 170 Standard for Fire Safety and Emergency Symbols The sign in the OP post "Fire Department Automatic Sprinkler Connection, Siamese" Example https://www.mysafetysign.com/fire-exit-signs/nfpa-170-fire-signs/sku-s-5589 However an ordnance will trump a standard. Signs with the letters...
  3. FacEngrPE

    Deaerator Inspection Frequency

    EPRI Has published a number of good resource documents related to inspection and operation of deareators. I have attached Deaerator Tank Assessment Guideline Dec 2010. The National Board publishes System Design, Specifications, Operation, and Inspection of Deaerators Link This document contains...
  4. FacEngrPE

    North Korean Ship Fails/Capsizes at Launch in Front of Kim

    The structural member in all cases i am aware of that synchronizes the dolly or skid motion is the ship hull. The launch systems I am aware of are all specific to individual shipyards (or possibly design agencies). At the launch pivot point, the skid assembly can be subject to very high...
  5. FacEngrPE

    Newly opened road fails in Vietnam

    FF4P+HWP, Vĩnh Phú Đông, Phước Long, Bạc Liêu, Vietnam
  6. FacEngrPE

    Spain and Portugal power grid collapse

    This sounds a bit like blowing smoke IEEE 1547-2018 Clause 6.5.2.6: Voltage Phase Angle Changes Ride-Through
  7. FacEngrPE

    Spain and Portugal power grid collapse

    Back to the OP's subject. It happened here already. 2022 Odessa Texas Disturbance ERCOT Presentation September 13, 2022 This event shows that a very short event can create enough upset in a power system to trip it off line quickly - although in the Odessa Texas event the system recovered...
  8. FacEngrPE

    Spain and Portugal power grid collapse

    Starting to see some well thought out discussion with better technical content. Still not much. Spain-Portugal blackouts: what actually happened, and what can Iberia and Europe learn from it? The Conversation US, Inc. Published: May 2, 2025 No incentive for keeping reserve with inertia on...
  9. FacEngrPE

    FIU Bridge Update - New Bridge Has Broken Ground

    There is purpose to architect Louis Sullivan maxim, Form Follows Function. Ignoring this makes structures that are or become headaches. More here
  10. FacEngrPE

    Spain and Portugal power grid collapse

    A short trigger event resulting in voltage and current oscillation sounds like inertia may have been too low to stabilize the system. Possibly the trigger event excited some resonance in the bulk power system. Admitted the current evidence is thin and essentially hearsay. Yahoo News April 29...
  11. FacEngrPE

    FIU Bridge Update - New Bridge Has Broken Ground

    Quote from FIU webpage Link I would not read this to say that the pylons and cables provide much if any additional capacity to the bridge deck. The geometry does not appear to support the pylon handling that much bending force. The arrangement should redundantly support the pylons and cables.
  12. FacEngrPE

    Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok

    Bangkok’s Collapse Scandal: Fake Steel, Chinese Builders, and a $60M Disaster China Spotlight Per this, there are all sorts of engineering, material, and administrative misdeeds. The construction (generic picture below) if correct is a type I expect is more sensitive to construction details and...
  13. FacEngrPE

    To replace faulty power alternator with a smaller unit

    It may be desirable to adjust the steam admission nozzle size, or reduce the number of active nozzles to match the load. This is another thing to consult with the turbine manufacturer.
  14. FacEngrPE

    Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok

    Link to USGS shake map https://earthquake.usgs.gov/earthquakes/eventpage/us7000pn9s/shakemap/intensity Bangkok ground shaking was nowhere near as intense as near the fault.
  15. FacEngrPE

    Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok

    7.7 magnitude earthquake, building under construction. Many under construction buildings will not meet design case load capacity, and this was a strong shaking. Many other buildings / structures damaged. This is clearly a tragedy. Building collapses in Bangkok after powerful earthquakes...

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