The agency's March 13 order gives owners 60 days to replace any 3-inch McKenzie UNNR ball valve in a tank car used to transport any hazardous material described in 49 CFR 172.101 and 90 days to remove ...
A recent Railworthiness Directive from the s Federal Railroad Administration orders railroad tank car owners to replace unapproved valves that are installed in some tank cars. They are UNNR ball ...
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