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| Author: | beng [ Wed Nov 07, 2012 1:31 pm ] |
| Post subject: | Distances between containment areas of xfmrs |
Hi All! I am curious if anyone has any knowledge of NESC or other regulations that deal with minimum distance requirements of containment areas between transformers. |
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| Author: | PaulEngr [ Thu Nov 08, 2012 6:54 pm ] |
| Post subject: | |
FM Global in particular publishes guidelines on this. They like to see 25 feet minimum with flammable fluids, and then they drop to a lower number (10 feet if I recall) for less flammable fluids, unless you have a 2 hour fire barrier between transformers or some sort of fire suppression (deluge) in which case it goes to essentially zero. The issue or concern for them is really a matter of liability...that if the containment of burning oil on a transformer fails, it overheats another one and causes it in turn to fail as well. With dry transformers the containment is a nonissue. Also, containment by itself generally doesn't really do a lot of good from an environmental point of view in the U.S. because it's still a spill and every time you have to drain the containment (rainwater), you have to test it to verify what it is to satisfy the regulators. So we stopped doing containment. |
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| Author: | SArni01 [ Mon Nov 12, 2012 10:30 am ] |
| Post subject: | |
As usual Paul's spot-on. I just thought I'd add there are a couple of companies that I know of who make the less flammable fluids - Cooper's Envirotemp FR3 and ABB's BIOTEMP. Both will require retraining on their use but, since they're plant based, are typically less hazardous to work with. |
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