What is the service life on rescue hardware (i.e. carabiners, pulleys, anchor plates, etc.)? When should hardware be retired?
Hardware is good to use until:
It stops functioning the way it did when it was new. Such as a carabiner gate not closing smoothly, or a pulley sheave rubbing against the side plate.
It has seen some use shock load or unknown forces beyond what is expected in normal use.
It has deformities or visible damage.