Water replacement for pressure-testing [closed]








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Due to circumstance, our Data Centre build has some delays and it currently looks like we're going to have to perform a hydrostatic test of our sprinkler system *with live computers in it*.


As I have an education as a chemist, *but haven't done any serious chemistry in >30 years* I thought of using another liquid than water to charge the sprinkler pipes and am looking for the following characteristics:


* Same order of magnitude of compressibility as good old H2O
* Non-corrosive to materials used in a Data Centre (Metal, plastic, ...)
* Non-flammable
* Non-conductive to electricity
* Non-HAZMAT
* Cheap (No liquid gold please, or the VP is going to blow a fuse) **;-)**


I tried googling a bit but could not find anything easily, so turning to the experts that deal with this on a daily basis as I've sent off the idea to the sprinkler installers already mentioning my preference for CHCl3 and C2H5OH as a joke, but if they ask me which liquid I would propose, what would be the ideal solution to the above problem?


A citation to a PubChem or similar source would be appreciated


