Lower Exe Mooring Authority

MOORING SCHEDULES

The LEMA Ltd  Management Committee have used national standards and manufacturers specifications of the individual component parts of the mooring gear, to group all the swinging moorings in the lower Exe in to just six standard  Mooring  Schedules.  The details of these six Schedules, recommended by LEMA Ltd for boats up to 13.6m (45ft) 10 tonnes, are set out below.

The aim of recommending these six standard Mooring Schedules is to reduce costs and increase safety.

 It is recommended that the size and strength of the individual components of swinging moorings for boats over 13.6m (45ft) and/or over 10 tonnes, are calculated individually by the mooring layer.

Schedule T  Drying Moorings for Tenders up to 6.3m (10ft ). Maximum tonnage, 0.13 tonnes.

To be used for drying moorings that will only be licensed by LEMA Ltd. for Tenders, Small Dinghies or Ribs, that are less than 10 ft (3.03m) in overall length, including projections, of light displacement and less than 0.13 tonnes. (130 kg approx 1 cwt,)

1-off  Sinker: min. 0.33 tonnes 

Sinkers must be buried in the river bed so that no part of the sinker is less than 300mm (1ft) below the river bed.

*Total Length of Riser to be calculated to produce a sensible catenary curve, e.g. Depth of water at max. HWS plus 3m.

**The length of the Pick-up chain or Rope Strop, is to be calculated for size of boat and position of its cleats.  The type and diameter of rope to be used for the Strop must be selected from Info Mooring Specifications 6.3, Table 3.

1 off - 10mm Dee Shackle, Breaking load: 1000kg. (Lower Riser)

3 off - 7mm Dee Shackles, Breaking load: 5100kg.  (Riser Chain and Swivel to Mooring Buoy)

2 off - 5mm Dee Shackle, Breaking Load: 336kg. (Pick-up Chain)

1 off - 6mm Regular Swivel, Galvanised, Breaking load 1600kg.

1 off - Inflatable Mooring Buoy: 

Minimum Buoyancy 63 kg. Circumference: 152 cm.  Diameter: 49 cm.(when correctly inflated).

1off - Pick-up Buoy

The length of the pick-up buoy line should not generally exceed 3m.

Schedule A Drying Moorings. For Boats up to 6.3m (21ft). Maximum tonnage, 0.6 tonnes.

Drying moorings will only be licensed by LEMA for vessels that are less than 6.3m in overall length, including projections, of light displacement, less than 0.6 tonnes and shallow draft.

1-off Sinker: 0.75 tonnes or 0.33 tonnes (if permitted ). Sinkers must be buried in the river bed so that no part of the sinker is less than 300mm (1ft) below the river bed.

* Total Length of Riser to be calculated to produce a sensible catenary curve, e.g. Depth of water at max. HWS plus 3m

** The length of the Pick-up chain or Rope Strop, is to be calculated for size of boat and position of its cleats. The type and diameter of rope to be used for the Strop must be selected from 6.3, Table 3.

1 off - 20mm Dee Shackle, Breaking load: 15 000kg. (Lower Riser)

3 off - 16mm Dee Shackles, Breaking load: 9 000kg. (Riser Chain and Swivel to Mooring Buoy)

2 off - 8mm Dee Shackle, Breaking Load: 2 5000kg. (Pick-up Chain)

1 off - 16mm Regular Swivel, Galvanised, Breaking load: 9 800kg.

1 off - Inflatable Mooring Buoy: (See also Section 5.4)

Minimum Buoyancy 63 kg.

Circumference: 152 cm. Diameter: 49 cm. (when correctly inflated)

1off - Pick-up Buoy. The length of the pick-up buoy line should not generally exceed 3m

Schedule B Deep Water Moorings. For boats: 6.3m (21ft) to 8.0m (25ft). Maximum tonnage, 1.5 tonnes.

2 off - Anchors each 14 kg single arm mooring anchors.

Where two anchors are used they must be connected by a length of ground chain laid in the direction of the strongest tide. The riser must be shackled at the centre of the ground chain,

1 off - Sinker: 1.0 tonnes.

* The total length of Riser is to be calculated be calculated to produce a sensible catenary’s curve, e.g. Depth of water at max HWS plus 3.5m

** The length of the Pick-up chain or Rope Strop, is to be calculated for size of boat and position of its cleats. The type and diameter of rope to be used for the Strop must be selected from 6.3, Table 3.

2 off - 22mm Dee Shackles, Breaking load: l7 750kg. (Ground Chain).

2 off - 18mm Dee Shackles, Breaking load: 15 000kg. (Lower Riser Chain).

3 off - 16mm Dee Shackles, Breaking load: 9 000kg. (Upper Riser Chain and Upper Riser Chain to Swivel).

2 off - 10mm Dee Shackles, Breaking load: 3 000kg. (Pick-up Chain).

1 off - 16mm Regular Swivel, Galvanised, Breaking load: 9 800kg.

1 off - Inflatable Mooring Buoy: (See also Section 5.4)

1 off - Pick-up Buoy.

Schedule C Deep Water Mooring. For boats: 8.0m (25ft) to 9.1m (30ft). Maximum tonnage, 5.0 tonnes.

2 off - Anchors each 16 kg single arm mooring anchors.

Where two anchors are used they must be connected by a length of ground chain laid in the direction of the strongest tide. The riser must be shackled at the centre of the ground chain,

1 off- Sinker: 1.0 tonnes.

* The total length of Riser is to be calculated be calculated to produce a sensible catenary curve, e.g. Depth of water at max HWS plus 3.5m

** The length of the Pick-up chain or Rope Strop, is to be calculated for size of boat and position of its cleats. The type and diameter of rope to be used for the Strop must be selected from 6.3, Table 3.

2 off - 26mm Dee Shackles, Breaking load: 25 500kg. (Ground Chain).

2 off - 22mm Dee Shackles, Breaking load: 15 000kg. (Lower Riser Chain).

3 off - 20mm Dee Shackles, Breaking load: 15 000kg. (Upper Riser Chain and Swivel to Mooring Buoy).

2 off - 12mm Dee Shackles, Breaking Load: 5 000kg. (Pick-up Chain).

1 off - 20mm Regular Swivel, Galvanised, Breaking load: 14 000kg.

1 off - Inflatable Mooring Buoy: (See also Section 5.4)

1 off - Pick-up Buoy

Schedule D Deep Water Moorings .Boats: from 9.1m (30ft) to 11.0m (36ft). Maximum tonnage, 7.5 tonnes.

2 off - Anchors each 22 kg single arm mooring anchors.

Where two anchors are used they must be connected by a length of ground chain laid in the direction of the strongest tide. The riser must be shackled at the centre of the ground chain

or

1 off - Sinker: 1.0 tonnes.

* The total length of Riser is to be calculated be calculated to produce a sensible catenary curve, e.g. Depth of water at max HWS plus 3.5m

** The length of the Pick-up chain or Rope Strop, is to be calculated for size of boat and position of its cleats. The type and diameter of rope to be used for the Strop must be selected from 6.3, Table 3.

2 off – 32mm Dee Shackles, Breaking load: 39 000kg. (Ground Chain).

2 off - 26mm Dee Shackles, Breaking load: 25 000kg. (Lower Riser Chain).

3 off - 22mm Dee Shackles, Breaking load: 17 750kg. (Upper Riser Chain and Swivel to Mooring Buoy).

2 off - 16mm Dee Shackles, Breaking Load: 9 800kg. (Pick-up Chain).

1 off - 22mm Regular Swivel, Galvanised, Breaking load: 19 000kg.

1 off - Inflatable Mooring Buoy (See also Section 5.4) Minimum Buoyancy (when correctly inflated) 63 kg. Circumference: 152 cm. Diameter: 49 cm.

1 off - Pick-up Buoy - The length of the pick-up buoy line should not generally exceed 3m.

Schedule E Deep Water Moorings. For boats: 11.0m (36ft) to 13.6m (45ft). Maximum tonnage, 10 tonnes

2 off - Anchors each 35 kg single arm mooring anchors.

2 off - Sinker of 1 tonnes (each).

Where two anchors or sinkers are used they must be connected by a length of ground chain laid in the direction of the strongest tide. The riser must be shackled at the centre of the ground chain.

* The total length of Riser is to be calculated be calculated to produce a sensible catenary curve, e.g. Depth of water at max HWS plus 3.5m

** The length of the Pick-up chain or Rope Strop, is to be calculated for size of boat and position of its cleats. The type and diameter of rope to be used for the Strop must be selected from 6.3, Table 3.

2 off - 38mm Dee Shackles, Breaking load: 54 400kg. (Ground Chain).

2 off - 26mm Dee Shackles, Breaking load: 25 500kg. (Lower Riser Chain).

3 off - 22mm Dee Shackles, Breaking load: 17750kg. (Upper Riser Chain and Swivel to Mooring Buoy).

2 off - 20mm Dee Shackles: Breaking load: 15 000kg. (Pick-up Chain).

1 off - 22mm Regular Swivel, Galvanised, Breaking load, 19 000kg.

1 off - Mooring Buoy (See also Section 5.4)

1 off - Pick-up Buoy