here we go. things are in the order in which i found them, top to bottom.
-to better introduce it, the first sentence could start with "Mothballing: some would translate..."
-ON the following page, not at
-"AND what problems and opportunities..."
-"begins to have" instead of "has"
-By idling the facility, its operating costs can be reduced to a minimum, and when demand rises again it can reactivate in a short time.
-generally, you don't need "the" when you refer to a general concept, like "costs" or "demand"
-"proper shutdown of *a* facility": a general facility, not one in particular
-no comma after "at the beginning is"
-comma after "bang for the buck", and nice expression
-no "the" before "different equipment", and no "a" before "different treatment"
-no return after "dangers that should be removed:"
-"material *IS* not removed properly" - keep your tenses straight
-"it can cause, besides additional costs when reactivating,"
-"security or ex-supervisor *personnel*"
-the last sentence of that material paragraph doesn't make sense; i'm not sure what you mean by "threads." However, removing threads entirely, it should be "Also, the reactivating people may not be familiar with the handling of the materials left behind." the word "left" is an exception in English; it's not commonly used as an adjective by itself in the way that you did. Instead, it's used like "the material left behind" or "the leftover material."
-the comma after "shutdown and mothballing" should be a semicolon, ";", to indicate an independent sentence joined on to the first sentence.
-"mostly" should be "usually" to indicate instances over time, as opposed to instances happening at once, when you would use "mostly"
-a fixed "Else" sentence: "Otherwise, little things like a forgotten line blind or a filter can damage the facility after reactivation and startup." startup is one word.
-"pirates of parts": the temptation is not high to the fact of pirating, it's high to the pirates themselves.
-comma after "finally"
-no "as" before "many mistakes", and mistakes are "made", not "done".
-comma after "expert"
-fixed last sentence: "So try to involve an expert as well as the former workforce, and don't try to make a fast buck by rushing the mothballing or pirating parts. You'll get it back multiple times when reactivating.