Mooring guidelines

  • Weight in Water:   A body submersed in water reduces its weight by an amount equal to the weight of the water it displaces. [ Archimedes Principle ]. For example, concrete loses about 40% of its weight when immersed in water.
  • Chain must be fit for purpose
  • Securing methods for shackles:  Wire    Large nylon tie-wraps      Welding
  • Swivel:   A swinging mooring must have a swivel. Forged design-not threaded and peened. Stainless steel swivel….pin cross section of 15mm. Steel or composite material….pin cross section of 18mm.
  • Buoy:   One third reserve buoyancy. Total buoyancy equals one and a half times the weight of all items suspended from the buoy excluding the mooring block. Buoy to have an identification mark.
  • Rope for swinging moorings:   Modern three strand rope is generally ‘soft lay’ making it easy to splice, but when used on a swinging mooring it can unravel.

FOR A VESSEL OF UP TO 20 FEET LENGTH OVERALL

A mooring block of 500 kg when immersed in water. Homogeneous material. Solid attachment point at least 19mm in cross section.

Bottom shackle: Tested shackle. 19mm minimum cross section.

Riser Chain: 19mm

All additional Shackles: 19mm

Swivel

Mooring Rope: 18mm Multiplait [ Anchorbraid ] Nylon Rope with thimble spliced into lower end. Anti-chafe material. Pick up Buoy.

Mooring Chain: 9mm with large link or welded shackle at ends to accommodate 19mm shackle.

FOR A VESSEL OF UP TO 30 FEET LENGTH OVERALL

A Mooring Block of 1000kg when immersed in water.Homogeneous material.Solid attachment point 19mm in cross section.

Bottom Shackle: Tested shackle. 19mm cross section.

Riser Chain:  19mm chain.

Additional Shackles: 19mm cross section. All shackles to be secured.

Swivel in swinging mooring.

Mooring Rope:  24mm multiplait [ Anchorbraid ] nylon rope with thimble spliced into lower end. Anti-chafe material. Pick up buoy.

Mooring Chain:  12mm cross section. Large link or welded shackle at ends to accommodate 19mm shackle.

FOR A VESSEL OF UP TO 40 FEET LENGTH OVERALL

A Mooring Block of 1500kg when immersed in water. Homogeneous material.Solid attachment point 25mm in cross section.

Bottom Shackle:  25mm cross section. Tested.

Riser Chain:  22mm cross section.

Additional Shackles:  22mm cross section. Secured.

Swivel for swinging moorings.

Mooring Rope:  28mm multiplait [ Anchorbraid ] nylon rope with thimble spliced into lower end. Pick-up buoy.

Mooring Chain:  19mm cross section.