I found this a bit strange, since broken pipes do not allow pumping anymore, the Metal refinery now stores its coolant.
This was much easier to notice using a coolant other than Polluted Water as it offgasses when inside the Metal Refinery. Using Empty Storage or deconstructing that refinery will now lead to a steam-splosion.
Save File for reference Spacerock.sav
Steps to Reproduce
Metal Refinery heats up coolant to boiling temp>Breaks pipe on output>Coolant begins to collect inside metal refinery
This issue has not been confirmed by a developer yet.