re: Will be a boilermaker helper. Would like some tips/advice and what I'll be doing.

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Probably frickin with a lot of pipe insulation and bolting/unbolting flanges, valves and other stuff.

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Insulators remove/install insulation. That's not this guys craft. The rest is correct.

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Boilermaker could range from actually working on boilers/exchangers

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Again, this is a specific craft that specialist companies will come in and do.

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unbolting/bolting up piping, installing blinds, replacing gaskets. Likely be using chainfalls and come-a-longs, metabo saws, impact wrenches.

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This is correct minus the metabo work. Only specifically trained journeymen use metabo's and it's an act of congress to get approval to do so.

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Try and learn what size wrench goes with what size stud, and what size stud goes in what size flange. Learn the steps of the process and have the next tool ready when it’s time.

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Good advice. I would add, learn their lockout/tag out policy and follow it to the letter. Make them show you that a line is empty by way of an open drain valve or an open flange before loosening the first nut. Always break the bolt furthest away from you first and do it slowly. This applies to removing existing piping. New installation is different.

eta: your best ability will be availability. Show up. If you're 10 minutes early, you're on time. If you're on time, you're late.