I have a doubt concerning PSV between pump outlet/inlet.
The pump is centrifugal, built according to API 610. The fluid is gasoline. The flowrate is 250m3/h and pressure on the outlet is around 10barg.
Should I put a PSV, connect outlet to inlet, opening to the inlet, for recirculation purposes? Or is the pump prepare for that, in case of obstruction or valve closing on the outlet side? For what I saw so far, there are only small Thermal relief valves.

Initiallay pumping against closing discharge valves the discharge pressure will reach suction pressure plus the "shutoff" head (its pressure equivalent) as flow goes to zero.  The pump will begin internal recirculation and start heating the gasoline and itself.  If it continues to run, overheating, vaporization of product, ignition and fire/explosion can result.  Temperature sensors connected to a shutdown switch are standard operating practice when pumping petroleum products.

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