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Post by Wheldale on May 26, 2012 6:01:06 GMT -5
When electrical equipment is recovered after being under water ie flooded roadway etc, is it allowed to dry out or is the equipment waterproof and there for can be used straight away? I was reading somewhere about a pit bottom that flooded years ago and took several weeks to de water. Just wondered if all the electrical kit had to be changed?
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Post by John on May 26, 2012 6:45:40 GMT -5
When electrical equipment is recovered after being under water ie flooded roadway etc, is it allowed to dry out or is the equipment waterproof and there for can be used straight away? I was reading somewhere about a pit bottom that flooded years ago and took several weeks to de water. Just wondered if all the electrical kit had to be changed?
Done dozens of motor overhauls on motors that have been under water. We also threw the rotor of a motor in the stove to dry the laminations out.
Coal mining equipment is flameproof, not waterproof, all gaps have machined flanges designed to allow the equipment to "breathe", gaps are laid down by law, usually a 1 inch gap shall be not more than 20 thousands of one inch. the equipment is submerged, water will penetrate those gaps. |
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Post by John on May 26, 2012 10:40:39 GMT -5
I remember a 65HP AFC motor coming in for an overhaul when I worked at J.Jones, our foreman, came out the office as he'd just pulled the motors history out the files, it was the very first motor to have it's windings encapsulated for the NCB a few years prior.
The guy who opened the motor up nearly got drowned...LOL It had been submerged on the face at the colliery where it was operating.
Anyway, the windings were meggered and showed a reading of Infinity!!! A sure sign encapsulation was a winner!! The windings tested perfect on our load test too! It was still stoved to dry it out though.
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