GENERAL CONSIDERATIONS
 
Before finalising your choice of mooring position with authority or club, consult your mooring contractor as to whether the area is safe for your vessel and that there is sufficient depth of water.
Before purchasing mooring tackle please take into consideration the following points:
To comply with our current standards, materials must have been manufactured for the purpose of mooring use and must be guaranteed as such.
Cheap commercial shackles, although new, may be unusable because of poor thread.
Modern, loose laid three strand rope (soft rope) must not be used as a bridle on a swinging mooring because it will unlay.
Cheap forged or welded swivels can part company, and if they are the screw type, are unsuitable for mooring use.
Materials used in the manufacture of mooring blocks must be of correct quality - e.g. not beach sand, not salt water.
Blocks must not be infilled with scrap, metal, rocks or building debris. They must be one solid mix, not layered.
Reinforcing bars or meshing should not be used.
Mooring blocks need a minimum of two weeks to set before being launched or used.
 
SWINGING MOORING FOR A VESSEL OF UP TO 30 FEET LENGTH OVERALL
 
Concrete block
Weight approximately 1,200 kg when immersed in water
Length of chain inside from bottom to top with one and a half links protruding to form eye for attachment.
This chain to be ferry chain or similar - approximately 40mm in section (+/- 5mm).
 
Guidelines as to size:
round block
Diameter 1.54 metres / 5 ft
Volume 1 cubic metre
 
Bottom shackle
Lifting D shackle, 26mm body, 28mm pin.
Secured by one of these methods: stainless steel locking strap or two nylon locking straps.
 
Chain
19mm / 20mm new long link chain
Scope for a swinging mooring to be equal to the total depth of water on the allocated position on a 7.2 metre tide
 
Shackles
All shackles other than the bottom shackle: minimum of 22mm cross section
Secured by one of these methods: welding, stainless steel locking strap, two nylon locking straps, three stainless steel wires.
 
Buoy
Suitable buoys might be:
85 inch circumference net buoy with short tail of 20mm to 24mm rope and thimble
SB1S (solid soft buoy with through chain)
 
Total buoyancy to equal at least twice the total weight of all tackle excluding block
To be marked with area initials and mooring number in large letters
 
Boat rope/bridle for swinging mooring
24/28mm multiplait nylon  Not three strand rope
thimble spliced into lower end
plastic pipe or layflat hose for anti-chafe
soft eye at boat end
pick-up buoy and rope
 
FAILURE GUIDELINES
 
Any chain or shackle measuring less than 15mm in any part of the cross section will result in that component being failed.
 
Chain usually lasts two and half to three years.
 
Boat ropes will be failed where one strand (in three strand) or two strands (in multiplait) are damaged.
 
FORE & AFT MOORING FOR A VESSEL OF UP TO 35 FEET LENGTH OVERALL
 
Two concrete blocks
Each weighing approximately 1,200 kg when immersed in water
Length of chain inside from bottom to top with one and a half links protruding to form eye for attachment.
This chain to be ferry chain or similar - approximately 40mm in section (+/- 5mm).
 
Guidelines as to size:
round block
Diameter 1.54 metres / 5 ft
Volume 1 cubic metre
 
Bottom shackle
Lifting D shackle, 26mm body, 28mm pin.
Secured by one of these methods: stainless steel locking strap or two nylon locking straps.
 
Chain
19mm / 20mm new long link chain
Scope for a fore and aft mooring to be calculated in consultation with the mooring contractor, having regard to length of boat, depth of water on a 7.2 metre tide, spacing between blocks and length of bridging rope.
 
Shackles
All shackles other than the bottom shackle: minimum of 22mm cross section
All shackles to be secured by one of these methods: welding, stainless steel locking strap, two nylon locking straps, three stainless steel wires.
 
Bridging rope
16mm orange polyethylene with thimble at each end.
at depth of 3 metres
Acts as a spacer: length to equal length of boat plus 6 metres
 
Buoy
Suitable buoys are:
Hippo buoy
SB1A (solid buoy with through chain)
 
Total buoyancy to equal at least twice the total weight of all tackle excluding block
To be marked with area initials and mooring number in large letters
 
Boat ropes
Four ropes in 20mm nylon (three strand or multiplait)
Two pick-up buoys and a surface joining line for when the boat is away from the mooring.
 
FAILURE GUIDELINES
 
Any chain or shackle measuring less than 15mm in any part of the cross section will result in that component being failed.
 
Chain usually lasts two and half to three years.
 
Boat ropes will be failed where one strand (in three strand) or two strands (in multiplait) are damaged.
 
FORE & AFT MOORING FOR A VESSEL OF UP TO 50 FEET LENGTH OVERALL
 
The mooring contractor should be consulted as considerations of weight and windage become very important with this size of boat and the specification may have to be increased accordingly.
 
Concrete blocks
Four concrete blocks, each weighing at least 1,600 kg when immersed in water
Length of chain inside from bottom to top with one and a half links protruding to form eye for attachment.
This chain to be ferry chain or similar - approximately 40mm in section (+/- 5mm).
 
Guidelines as to size:
round block
Diameter 1.54 metres / 5 ft
Volume 1 cubic metres min
 
Bottom shackle
Lifting D shackle, 26mm body, 28mm pin.
Secured by one of these methods: stainless steel locking strap or two nylon locking straps.
 
Chain
19mm or 20mm new long link chain
Scope for a fore and aft mooring to be calculated in consultation with the mooring contractor, having regard to length of boat, depth of water on a 7.2 metre tide, spacing between blocks and length of bridging rope.
 
Shackles
All shackles other than the bottom shackle: Lifting D shackle, 22mm body, 25mm pin
Other shackles may be used in consultation with the mooring contractor
Secured by one of these methods: welding, stainless steel locking strap, two nylon locking straps, three stainless steel wires.
 
Bridging rope
16mm orange polyethylene with thimble at each end.
at depth of 3 metres
Acts as a spacer: length to equal length of boat plus 6 metres
 
Buoy
Suitable buoys are:
SB1A buoy or similar
 
Total buoyancy to equal at least twice the total weight of all tackle excluding block
To be marked with area initials and mooring number in large letters
 
Boat ropes
Four ropes in 24mm nylon (three strand or multiplait)
Two pick-up buoys and a surface joining line for when the boat is away from the mooring.
 
FAILURE GUIDELINES
 
Any chain or shackle measuring less than 17mm in any part of the cross section will result in that component being failed.
 
Chain usually lasts two years.
 
Boat ropes will be failed where one strand (in three strand) or two strands (in multiplait) are damaged.