Can an isolating valve and filter be outside the secondary containment?
Yes. In a situation involving a fixed draw off from a prefabricated tank the isolating valve and filter can be outside the containment. In this instance they would be regarded as ancillary to the down stream equipment. The isolating valve needs to be accessible in an emergency so can be outside the prefabricated system but we recommend that they are put inside the secondary containment if possible.
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