To meet ABYC standards the cover needs to be able to "blow off" should
the propane cylinder explode. Maybe the ends of the barrell blow out,
but I think the cover has to blow vertically.

Also, the lashings suggest that the barrel is only temporarily in
place. It would be dumb, I think, to clutter up the workspace on the
deck with anything as pedestrian as an enormous propane locker. And a
propane locker would be affixed more permanently where ever it might be
appropriately located.

True. I have no idea what it's for then. I'm out of ideas. I have seen it
on other boats but I cant find the pictures right now so I couldn't say.

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