Knot to tie snapbolt to hose.

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Thanshin

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Location
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[Disclaimer: I'm no DIR, knots or even diving expert.]

I've seen several images and videos about how to correctly tie a snap bolt to a hose. I've come to believe this is the official DIR way.

Trying to describe it with words, it comes down to running the line three times between hose and bolt and then doing two reef knots on the opposite sides of the connection between the two items. [edit: maybe the first was just an overhand knot and only the second a reef knot]

My questions are:
- Is that some kind of "standard" knot for that purpose?
- Do you have a reference to an analysis of why is that the chosen knot?
- Isn't the melting of the line the only thing stopping the reef knot/s to capsize (ABoK #1205) and run open (in reverse order of tying)?
 
I don't have a reference to any analysis of why this method of tying was chosen. It does have the virtue of being simple, and of snugging the loops down on the hose quite well, so that the resulting connection doesn't slide.

If it is well tied and tensioned, it will stay without melting the ends into the center knot, and without superglue. I think we do these things for insurance, because it's so annoying to have something come loose during a dive.
 
It's a square knot! The favorite of Boy Scouts the world around. No need to question what works. ;-)


Sent from my iPhone using Tapatalk
 

Thanks for the link. I already explored and enjoyed the animated knots and then went to read the Ashley book of knots (it's quite big, so I'm not near to finish it. I think my 100m of line might die before I reach the end :D )

That's precisely the reason I questioned the use of the reef knot. I don't doubt there's a reason to use it, I just don't know that reason. (for example, being quicker to cut with a knife than a sturdier alternative like a constrictor knot over the crossed links, might be a reason.)
 
Not sure how you interpret the Double Constrictor for the purposes mentioned in this thread. It doesn't separate and stabilise the two items like the Cave Knot mention does.

OP also mentioned the "DIR way"... that's the cave knot.
 

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