Lifelines and accessories.

[coopec]

I'm trying to work out what I need for lifelines and accessories. Since my yacht is 43ft I could get away with 4mm but I have opted for 5mm.

Table 8
LOA minimum wire diameter
under 8.5 m (28ft) 3 mm (1/8 in)
8.5m – 13 m 4 mm (5/32 in)
over 13 m (43 ft) 5 mm (3/16 in)

The breaking strain of 316 1X19 5mm wire is 2200kg so therefore I need M8 turnbuckles (see table below)

AND M8 "D" shackles
M8 Straight D Shackle D - 8mm L - 32mm A - 16mm Breaking Load - 3000kg

Have I overlooked anything?

 

[dunedin]

I can't see why length of boat has any relevance to the size of wire for lifelines - unless a smaller boat is going to be sailed only by liliput sailors weighing less than those on bigger boats. And the wire size is more about being wide enough not to act as a cheese cutter (ie not not causing injury to falling sailor) rather than breaking strength.
Hence 5mm is good as less of a cheese cutter size. But don't necessarily need huge turnbuckles. Indeed there is a good case for using a multi-part string lashing at the ends, which can be cut quickly to get somebody back on board - and also very inexpensive.
Turnbuckles introduce risks of clevis rings falling out, catching on ropes etc - and can get bent by careless routing of mooring ropes and sheets. hence again why lashing arguably better. If do use turnbuckles, can get ones which one end is swaged onto the lifeline, making neater and one less set of clevis pins and rings to catch on things.
PS Of course, never plastic coated wire as hides corrosion

 

[coopec]

I can't see why length of boat has any relevance to the size of wire for lifelines - unless a smaller boat is going to be sailed only by liliput sailors weighing less than those on bigger boats. And the wire size is more about being wide enough not to act as a cheese cutter (ie not not causing injury to falling sailor) rather than breaking strength.
Hence 5mm is good as less of a cheese cutter size. But don't necessarily need huge turnbuckles. Indeed there is a good case for using a multi-part string lashing at the ends, which can be cut quickly to get somebody back on board - and also very inexpensive.
Turnbuckles introduce risks of clevis rings falling out, catching on ropes etc - and can get bent by careless routing of mooring ropes and sheets. hence again why lashing arguably better. If do use turnbuckles, can get ones which one end is swaged onto the lifeline, making neater and one less set of clevis pins and rings to catch on things.
PS Of course, never plastic coated wire as hides corrosion

I did wonder why a larger yacht needed heavier wire rope but I put that down to greater distances between stanchions (can.t think of anything else)

I'll have safety netting as well as the lifelines.