Check those Hose Clamps

Corrosion led to this failure

While tightening a hose clamp after changing the engine's impeller I heard a single, and distinct, click.  At first I thought is was the screw slipping.  Suspicious I pulled the clamp off and inspected it.  As the picture shows, it was the band breaking that made the sound.

This is the second broken hose clamp I saw this week.  The first was from a PSS packing gland.  It had been in place and untouched for eight years.   This failure is scarier because it means that hose clamps, even if not tensioned farther, have a definite service life.  For a PSS, it's less than eight years.  I wonder how long it is for the hose clamps that are installed on the through hulls?

Dave Howell, on the hard aboard Nellie D. 37VT63, Port Charlotte, FL.