Dist. Board Cellar

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Alwayslearningelec

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Have a 2 section 1200A distribution board that's a total of 700lbs going in the cellar of a new construction job.

The only practical way to get it down there would be rigging it down? Thanks
 
To me "rigging" it down means dropping it in place with a crane.

It is probably the easiest way if there is a hole in the floor you can drop it through.
 
Crane or a telehandler ("Lull" or "shoot-boom" to some) if you have one and a hole in the right place, a Genie Superlift from the basement could work, etc. OTOH 700 pounds isn't that much- 4-5 healthy folks could slide it down some stairs on 2x6 planks (watch piano movers doing a grand piano- I just had a Steinway grand moved, with it on a sled 5 guys pushed it up a flight of stairs).
 
As Bob asked is there a hole in the floor? If so a chain fall, some slings and a handful of shackles is will work.
 
I don’t know if there will be a “leave out”. It’s new construction. Assume we could drop it in place before they our the slab above but that would probably be WAY too early.
 
What is "too early"? Sounds like it's "too late" when the slab above has been poured. And you probably already have a crane or such at the already, so there's minimal extra cost.

It's quite common to set large equipment in place months before it would be connected and then build around it. (There may be other considerations, like basement flooding, but balance that against "20 minutes today and it's sits for 6 months or it's sits somewhere else for 6 months then takes a day to get into place".)
 
Can they be easily disassembled into more-manageable pieces?

zbang said:
... It's quite common to set large equipment in place months before it would be connected and then build around it ...
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I worked at a place that had two large air compressors like that. Two stories tall, first stages have 24-inch bores and 30-inch strokes, the motors are seven feet in diameter, they're equipped with their own ladders & platforms for service, and even if you could move them in one piece, they wouldn't fit through the 10x14-foot doors. (which were erected later)

Our annual visit from Inventory Control was always fun. The work-study students would often walk between them, looking down for two air compressors resembling the one in their folks' garage.

infinity said:
... a chain fall, some slings and a handful of shackles ...
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Isn't that sort of the definition of rigging?
 
augie47 said:
That will do it :) A local facility (AEDC) calls there small wind tunnel motor a 44,000 HP
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Yeah, there's something special about motors that require you to call the POCO and get their OK before starting.

I worked for Sverdrup for a while, though not on any Arnold Center projects. I've always wanted to see the place. Or better yet, work on one of their new projects. But I never quite made it to Tullahoma.

There's some fun stuff here in Detroit. We built a high-altitude dyno lab (50 kPa; 18,000 feet equivalent) and all-weather wind tunnels for Chrysler. (desert sun, rain, freezing rain, snow, you name it)
 
I visited AEDC in the late 90's and stayed at the Wingo Inn on base. They said they had to call up the TVA about 30 minutes before they fired up either the transonic or supersonic wind tunnels so that they could get ready for that load. As we stood in the nozzle of the supersonic wind tunnel, one of us asked what was the maximum velocity that could be achieved (when hydraulic cylinders bent the 3/4" walls of the steel nozzle to the narrowest aperture). All they would say was "Mach a bunch". :)
 
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drcampbell said:
Yeah, there's something special about motors that require you to call the POCO and get their OK before starting.
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I got to tour the big wind tunnel at NASA Ames, 6x 22,500hp motors. I asked they guy if they have to call the POCO before they turn it on, he said it went something like "Calls special number 'hey its jim at ames....yeah.... we're turning it on'" He also said turning it off (esp emergency shutdown) was a bigger deal then turning it on, I guess whatever the major generating sources are for that area don't like dropping 135,000HP of load. There's a big switchyard outside of it, I thought it was for the entire facility but its just for the wind tunnel.
 
We dropped by the house of the Colonel who was in charge of all facilities at AEDC. There was a lake out back where they could do boating, fishing, etc. I mentioned it was nice that they sighted the facility where there was a lake. He said they dug out the lake so they could cool the all the wind tunnels, test cells, etc. (our jaws dropping as we looked out at the lake).
 
Re Ames- until maybe 20ish years ago, I think the closest generation was Hunter's Point PG&E in San Francisco, but there may have been a peaker in Oakland next to Jack London Sq and maybe some others. OTOH, there are several quite large transmission lines through the area (along Stevens Creek).

Looks like they upgraded, Wikipedia sez-
The major element of the tunnel complex is its main drive system. The main drive consists of four wound-rotor-type induction electric motors connected in tandem. Each motor is rated to produce up to 65,000 Horsepower and 7200 volts. Combined, the main drive system can produce up to 260,000 horsepower. Drive speed is currently controlled by a liquid rheostat system.
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Be sure you can replace it when it fails. Everything fails. I have seen at chemical plants they built all around reactors, etc.. Then they has to move it out!
 
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