Originally Posted by HeadMistress
Looks like a take off on something I saw used to stop a leak that was about to sink a submarine in a movie. That one was a big sheet metal (looked like aluminum) collar with a flange at each end that wrapped around about a 6" pipe and was secured with screws/bolts & nuts through the flanges. Something like that could easily be made smaller to use on boats a lot smaller than submarines.
What you described is called a Robar clamp. Common in Public Works and water pipe repair in industry.
Not so common in submarines.
We used a Vise-Grip chain wrench and a strong back, with band it strapping to hold it together.
For damage control equipment on my boat, I have a few different types of Belzona (2311 and 1221), some polyurethane pipe wrap, and some Scotch 70 silicon tape.
I do have a chain wrench on board. Not sure why...