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  1. Gr8blu

    Roller Coaster Design Challenge

    An internet search using the term "physics of roller coaster vertical loop" might give you some very useful results ... One more thought: does rolling along a flat surface or slight downward incline result in higher "exit" speed - or does exiting the loop?
  2. Gr8blu

    Working as a building engineer outside of Spain.

    As a general statement, other countries (and sometimes other areas within a country) will check what you've learned against what they expect from the locals with the same proficiency. In your case, that means the "technical architect" degree program. There are multiple ways to do this - the...
  3. Gr8blu

    Where can I find dessicant data?

    A simple search engine check with the term "properties of desiccant materials" yields about 1.4 MILLION results. You would still need to refine the search for the specific materials (or material vendors) you're looking for, but it's a start.
  4. Gr8blu

    Durability of Industrialized Construction: How Does It Hold Up Over Time?

    Take a second and think things through. How are the panels made - and what tolerances? Of what materials? How are they put together to form structures? How do those answers stack up against "traditional" (whatever that means in your part of the world) materials and geometries? What factors...
  5. Gr8blu

    Key Aspects of Timber Construction

    Search engines are your friend. Just be critical of the data you get - think it through on whether it makes sense.
  6. Gr8blu

    Safety factor for selecting hydraulic cylinders in cranes

    There are a lot of different ways to drive motion in a crane - so EN 13001 simplifies it down to the actual forces that result from those methods. Since you're the designer of the crane SYSTEM, you know what driving units you're going to choose/use and therefore what forces they will apply to...
  7. Gr8blu

    Concrete Block Security Vault Class M

    Amazing what a web search will discover ... https://civilengineersstandard.com/wp-content/uploads/2019/02/F-1247.pdf
  8. Gr8blu

    API 546 - Sealed winding conformance

    If the machine is intended to operate where there is a high likelihood of appreciable moisture - either through condensation or other environmental conditions - using a sealed insulation system is probably a wise choice, particularly for machines operating above a few hundred volts. The more...
  9. Gr8blu

    To replace obsolete Mark VIe steam turbine control system

    About 3/4 of the way down the webpage that the following link takes you to is a webinar where the vendor team discusses options for how to handle obsolescence. Note that the VIe control system is designed to be modular - which means there should be bits and pieces that can be upgraded/replaced...
  10. Gr8blu

    Generator with low IR

    Please understand what the test is actually telling you. An insulation resistance measurement is determining the resulting dielectric capability of an insulation system as a result of absorbed moisture INSIDE the insulating material, AND the presence of conductive SURFACE contaminant. Both of...
  11. Gr8blu

    I feel like I wasted 2 years — advice from senior engineers appreciated

    1. One cannot be "on a visa" with an expired passport. When the passport expires, THE VISA EXPIRES THE SAME DAY. Note: most of the time one CAN renew their passport during the period of a visa, if two requirements are met - first, the visa allows it and second, the renewal can be accomplished...
  12. Gr8blu

    Learning NX and building car jack

    For P1-9 I would : 1. Create the cylinder (67 mm length by 54 MM diameter) 2. Add on the 45 x 45 x 33 mm rectangle at one end 3. Locate the correct position and add the two rectangular feet below the cylinder 4. Locate and remove material from the first rectangle to mimic the 20 mm diameter...
  13. Gr8blu

    Learning NX and building car jack

    The P1-17 image has two chamfers. The one at the bottom of the bolt (0.75 x 45 deg) can be created using either a known intersection and an angle (0.75 from end of bolt for example), or by chamfering between two known intersections (each 0.75, since the angle is 45). The one at the top on the...
  14. Gr8blu

    Two-winding equivalent for the three-winding transformer

    See another thread that is currently under discussion ... https://www.eng-tips.com/threads/two-winding-transformer-equivalent-from-a-three-winding-transformer.528343/
  15. Gr8blu

    Small IP68 Fans

    How small is small? The physical casing surrounding a rotating machine that meets IP67 or 68 is going to impose some limitations on minimum volume because to meet the ingress protection rating requires that there is no effective air exchange between the exterior and interior of the casing...
  16. Gr8blu

    Learning NX and building car jack

    Take P1-11 as a simple example. There is a solid cylinder with 20 mm diameter and 45 mm length. Inside the cylinder is a rectangular cutout that runs parallel to the axial center of the cylinder. It is 10 mm wide. Note that there are two assumptions made: 1. the rectangle is actually square...
  17. Gr8blu

    Reactance and Time constant tests for a generator

    The reason for "direct testing" of direct-axis reactances is that it IS pretty much a direct measurement from the data that can be physically tested for. There is also some fairly well-known relationships between the direct axis and quadrature axis values, as there is between positive (direct...
  18. Gr8blu

    Reactance and Time constant tests for a generator

    Most OEMs who manufacture "standard" ratings will have a very capable ability to calculate the expected synchronous, transient, and subtransient reactances for their generator internal geometries and "normal" ratings. Proof of performance is accomplished during the factory acceptance testing...
  19. Gr8blu

    High hydraulic conductivity materials

    @zelgar : 500 in/hr * 2.54 cm/in * (1/3600) hr/s = 0.35 cm/s not 0.055.
  20. Gr8blu

    Easy ways to explain how greywater reuse works?

    Since your post hinted that you're basing comparison or viability on financial criteria (payback period, Net Present Value, Internal Rate of Return) instead of environment (once-through system, for example) then you need to also define a specific duration BEFORE making the comparison. For...

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