OT: Cracked steel beams found in San Francisco 2.2$ Billion transit center - Page 2
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  1. #21
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    We have had a lot of issues here (New Zealand) with Chinese steel including recent prosecutions over faked or non exiting tests for reinforcing mesh. Here in the Shaky Isles, we get a few earthquakes, and the steel is to brittle, which could lead to catastrophic failure of concrete structures. There have also been issues on some major construction projects with imported fabricated steel which is not up to scratch.
    Geoff

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    Quote Originally Posted by Geoffm View Post
    We have had a lot of issues here (New Zealand) with Chinese steel including recent prosecutions over faked or non exiting tests for reinforcing mesh. Here in the Shaky Isles, we get a few earthquakes, and the steel is to brittle, which could lead to catastrophic failure of concrete structures. There have also been issues on some major construction projects with imported fabricated steel which is not up to scratch.
    Geoff
    Yall did it alllll wrong.

    You need to farm out everything.

    The specification of it, the design of it, the engineering of it.
    The safety factors needed, the steel, the piers.

    They will build it for nothing, and put a toll booth on it.

    Bring in their own work camps too....

    A Chinese-built Kenyan bridge collapses in Busia two weeks after president Uhuru Kenyatta commissioned it — Quartz Africa

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    Quote Originally Posted by Geoffm View Post
    We have had a lot of issues here (New Zealand) with Chinese steel...
    Japs recently got busted for the same thing, they had been cheating on certs on for years. And the company that built the worthless bolts that are supposed to hold the bay bridge to the planet was a US company. And the imbeciles who put the towers up so crooked that they had to put a cable on one from the nearest mountain and bend it straight, US construction firm. And the three block long subway in SF that Pelosi's husband's company has been building for the past five years, they put in all the wrong rail.

    Personally, I don't think it's about nationality anymore. Rank stupidity seems to be prevalent everywhere.

  4. Likes charlie gary liked this post
  5. #24
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    Quote Originally Posted by DanielG View Post
    It's called post-weld heat treatment (PWHT). The temperature is 400-500 degF lower than you use for annealing. It also makes weldments significantly more stable for machining.

    Interestingly, AWS D1.1 has rules for how to do PWHT, but it does not have rules as to when it is required, even on thick pre-qualified joints. The BPVC, on the other hand, requires it for >1.5" thick, and sometimes >1.25" thick.
    Yes, and those vessels are regularly longer/taller than 65'. Finding an oven big enough for that beam shouldn't have been an issue, unlike actually getting it there.

  6. #25
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    Quote Originally Posted by EmanuelGoldstein View Post
    Japs recently got busted for the same thing, they had been cheating on certs on for years. And the company that built the worthless bolts that are supposed to hold the bay bridge to the planet was a US company. And the imbeciles who put the towers up so crooked that they had to put a cable on one from the nearest mountain and bend it straight, US construction firm. And the three block long subway in SF that Pelosi's husband's company has been building for the past five years, they put in all the wrong rail.

    Personally, I don't think it's about nationality anymore. Rank stupidity seems to be prevalent everywhere.
    Those bolts were not the companies fault. they asked if they wanted them treated after manufacture to reduce hydrogen embrittlment problems. Cal trans was not willing to pay extra so it was not done there. I think the company thought it would be done latter by an outside supplier since they had told Cal trans it should be done for safety reasons.
    Bil lD

  7. #26
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    Em .. I used to deal with the nr 1 global manufacturer of port container cranes.
    And got to run the local crane here in Barcelona.

    Their experiences were that in the USA 130% of welds had to be gauged out and re-done, sometimes 3 times.
    In Spain, about 80%, iirc.
    They x-rayd 100% of welds on all crane stuff themselves on-site.

    Where the SF transit beams have failures, it is due to corruption, graft, and short-sighted cutting of corners.
    And lack of oversight, like my crane example.
    Certainly in the US perfect welds are available, on structural items, given decent pay.

    I find it amazing that it is not criminal, or not investigated, when major infra projects fail due to graft like that, in the US.
    And that none of the top brass ever gets indicted, fined, or jailed.
    It would be very simple to have sworn affidavits from the bosses before start to faithfully ..
    and sign every major op in a book openly displayed, publicly.

    "Under penalty of perjury I sign, attest and affirm that ops a,b,c have been ordered as d,c,e.. and are under work to the best of my knowledge. ..."

    If a poli does not want to so sign, another can be found.
    If a contractor does not want to sign personally, another can be found.


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