North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Re[2]: telehouse - 25 broadway
Unnamed Administration sources reported that Leo Bicknell said: > > > > I think "limited" here is a bit misleading. Most of these engines > are continuous duity rated, which means within the bounds of > maintenance items (oil changes, gasket changes, and other routine > maintenance) they can run non-stop. Most gensets are essentially > the same components that power diesel-electric locomotives that > routinely run for weeks at a time without shutdown. They may be continuous duty rated, but in this application? I.e. - the ones I have worked on (to limited extents; change filters, oil, repair FUBARs in the control systems design [1] had two rating: N kw continuous duty; {say} 1.4N intermittent. Intermittent may well be 24H or less; I bet the 1.4 is a f(run time/week) or such. > Here in ice storm country every few years power is out for 3-4 days > in some areas after bad storms. Generators routinely run for 3-4 > days and cause no concern over their condition, other than to move > up routine maintenance due to the additional run time. > I suspect dust is going to be the largest problem for all generators > in the area. It will reduce radiator effectiveness, wear on external > parts (fans and the like), clog air and oil cleaners. Again, these > devices are made for some fairly harsh environments so 48 hours is > no concern, I would think expecting 2 weeks of reliable power if > they are attended to even in these conditions is reasonable. This is just as much a case of matching equipment to application as is buying a new backbone router. Do you buy based on a "100 year flood" peak; the "Mothers Day calling" peak or the "105% of >1hr" model. Justify your decision the the beancounter. 25 points. I do not know what all the Ma specs [Sean: is this p/o the FCC regs, NEBS, or ??] call for, but I'd guess 2-3 days tops. [1] Engines are big noisy devices. When you use high impedance input logic (from slow crude mechanical sensors such as oil pressure and water temp switches) that responds in a few microseconds, and have no filtering debounce on them; duh, you get lots of false alarms. Slow things down to a 500ms time constant, and they work far better. Filter the power supply {Hello! The generator just started -- yep, the line WILL spike...} well as well, and hey, it does work after all. I hope other folks did better design work than those guys. -- A host is a host from coast to [email protected] & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
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