RE: Spud next weekend8 Apr 2019 21:28
BlooBird,
"If that single line snapped, do you know if there is any danger of it whipping back and striking one of the tug-boat crew … or are there safeguards to prevent that from happening?"
Fret not, that would not happen. And anyway, the chances of the tow 'snapping' are very low. Despite my use of the technical term 'tight tow', the line is not a thing stretched tight over the ocean, like some sort of strongman act! In fact most of the line will be below the surface of the waves. Naturally it's in tension, but the only time there might be some kind of whiplash effect would be in the very likely circumstance that the wire parted more or less on the tug's deck. And there's no reason that should happen, except in and unexpectedly hitting excedingly high weather. But if bas seas were forcast, they wouldn't have started the tow.
This is a routine job for the people doing it, unlike the buoy pullin and subsequent 'rope saga', which was the first time in 14 years, (if memory is correct).
Also heavily over-engineered, with massive safety margins.
Personally I've only seen a towline fail once, (at a designed 'weak point'), during a jackup tow off W.Africa, and already despite both tugs giving it all they'd got, we were moving backwards! The line just flopped into the water. OK, sorting it out took a while, 'cos now we were moving backwards even faster, with other platforms not too far away. But that's a different story.