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  • Users: HgTX
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  1. HgTX

    Duane Miller on being cautious about seal welds

    http://www.jflf.org/pdfs/papers/design_file6.pdf My main takeaway: a seal weld doesn't know it's a seal weld, and if it's undersized or of poor quality, it can cause trouble. But Duane says it better than I would. Have a read. Hg
  2. HgTX

    "E7018": a rant to designers.

    "You keep using that word. I do not think it means what you think it means." (Princess Bride) I am posting this in this particular forum because bridge welding is more likely than structural welding to have long machine welds. Almost every set of plans I see requires E70XX or E7018...
  3. HgTX

    ASME BPVC Section IX QW-452.3, large diameter

    As I read QW-452.3, ANY pipe over NPS 2-1/2 qualifies for diameter down to NPS 2-1/2. Which means, in theory, someone could weld pipe with 6 ft diameter and qualify to weld 3" diameter. They'd be a long time welding, but it looks like it would be legal. At what point does pipe become plate...
  4. HgTX

    accounting for workers' presence in design?

    I have a vague recollection of some design provision that included a 300-lb. load at 12" eccentricity to account for a worker that might be hanging off the structure during the member's installation. I was pretty sure that this was somewhere in AISC 360 but that would appear not to be the case...
  5. HgTX

    Section IX supplemental variables

    Need a sanity check. QW-251.2 appears to say that the supplementals (e.g., additional restrictions on minimum thickness & maximum heat input) kick in automatically whenever Charpies are required. We have WPS/PQR provided by a sub. They have Charpies, but don't seem to have worried about the...
  6. HgTX

    turn of the nut for A449 bolts?

    Are there published recommendations/requirements for installing A449 bolts by the turn-of-the-nut method? RCSC only covers A325 & A490. Hg Eng-Tips policies: faq731-376
  7. HgTX

    weldable 105-ksi rod?

    I'm thinkin' no such thing, but I might as well ask. But rather than presuppose a solution, let me describe the full problem. U-bolt. ASTM F1774 Gr. 105. Code limits the depth of the "U" and the diameter of the bolt. U-bolt goes through several plies of steel and has bolts on both sides of...
  8. HgTX

    bend test for thermal-sprayed zinc

    Can anyone think of a reason one should be failing bend tests but passing pull-off adhesion tests? Also, I wonder if we're failing or just doing the test wrong. The obvious fails look just like the failing picture in SSPC CS-23 or AWS C2.18. But the rest look just like the "marginal" picture...
  9. HgTX

    AWS C2.16 certification for thermal spray operators?

    Anyone see this certification around much? I turn up almost no references on the web other than to the document itself. Hg Eng-Tips policies: faq731-376
  10. HgTX

    Bridge drawings as security sensitive information?

    Has anyone run into having your bridge plans and shop drawings declared to be SSI? Considering that it doesn't take a whole lot of mechanical aptitude to eyeball a bridge, no plans in hand whatsoever, and determine what areas one would need to take out to bring down the structure, this notion...
  11. HgTX

    Changing the Conversation about Engineering

    http://www.engineeringmessages.org/ (I searched and didn't find this already posted here; please forgive me if it is a rerun.) Hg Eng-Tips policies: faq731-376
  12. HgTX

    insurance when PE license not required (but exists?)

    Related to an earlier question: I hold a professional engineering license. I don't stamp anything. A license is not required for my position, though some of what I do I could argue is engineering (and may even do so for getting an additional license). Do I need E&O or any other kind of...
  13. HgTX

    AASHTO LFD edge distances

    In the old AASHTO code, a distinction was made for rolled edges between beams and channels on the one hand and other shapes on the other. Is this because there is something different about the edge of a beam or channel as opposed to other shapes (such as angles and I don't know what else), and...
  14. HgTX

    structural stainless--unobtanium?

    I have a designer who wants stainless steel for corrosion protection & aesthetics, but assumed he could use typical carbon steel properties in the design. So he assumed yield strength of 50 ksi and ultimate tensile strength of 125 ksi. I fear I may not be able to make this work. These are rod...
  15. HgTX

    yet another insurance question

    Scenario: job does not require the job-holder to be an engineer, but it's considered a plus. Engineeringesque solutions may be proposed by the job-holder, but will ultimately be approved by the client. No sealing involved. E&O insurance needed? Hg Eng-Tips policies: faq731-376
  16. HgTX

    and sometimes I actually do like my job

    It's a quarter to eleven at night, I have my fall protection harness and my hardhat, I'm about to get in the car and drive three hours, be back outside at 6 AM to witness a monumental erection and maybe climb up in it. This is what it's about. For me, anyway. Hg Eng-Tips policies: faq731-376
  17. HgTX

    Terminology question

    In most of the QC/QA world, as I understand it, "QC" is inspection and "QA" is the higher-level system management function that addresses root causes, etc. In the bridge world, "QC" is the fabricator's QC/QA function, and "QA" is the owner's inspection to whatever extent they want to do it...
  18. HgTX

    communication of resource needs?

    How do you deal with superiors who just don't understand what's required to perform a particular task? There have been several threads here where someone writes in to say that they're being asked to do too much with too little time and manpower, and answers come back to tell the Powers That Be...
  19. HgTX

    stiffener vs. "connection plate"

    There are designers who believe that a connection plate (which looks just like a transverse web stiffener except that a diaphragm or crossframe attaches to it, and thus has positive connection to both flanges whereas a stiffener might not) doesn't count as a stiffener, and thus is not to be...
  20. HgTX

    I'm not in it for the money...I'm not in it for the money...

    Went to an alumni event last week. Found out that STARTING salaries for people graduating from my program with a BS are right around what I'm making now after 10 years and an MS. I remind myself...no one takes a government job for the high salary. But it wasn't fun to find out, anyway. Hg...

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