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MOORING BUOYS

I - TYPOLOGY

A) MOORING BUOY WITH STEEL FRAME

Those buoys are for the mooring of vessels with variable displacement, tonnage and length – Total buoyancy ranging from 3t to 40t, more if required for specific usage – Either with a fixed through steel arrangement to distribute the forces from the mooring line or removable elements or bespoke steel work. Various options, elements, fixings are available. 

   Mooring Buoys                  Coffre d'Amarrage à Axe Fixe 

 

B) MOORING BUOY WITH REMOVABLE STEEL FRAME

Those buoys are for the mooring of vessels with variable displacement, tonnage and length – Total buoyancy ranging from 3t to 40t, more if required for specific usage – Either with a fixed through steel arrangement to distribute the forces from the mooring line or removable elements or bespoke steel work. Various options, elements, fixings are available.

CHAIN SUPPORT BUOY                   Coffre d'Amarrage à Axe Extractible 

 

 C) THROUGH MOORING BUOY

Those buoys are for the mooring of vessels with variable displacement, tonnage and length – Total buoyancy ranging from 3t to 40t, more if required for specific usage – Either with a fixed through steel arrangement to distribute the forces from the mooring line or removable elements or bespoke steel work. Various options, elements, fixings are available.   

     Coffre d'Amarrage à Puits de Chaîne        Coffre d'Amarrage à Puits de Chaîne 

 

D) ANGLED STEEL FRAME MOORING BUOY

Those buoys are for the mooring of vessels with variable displacement, tonnage and length – Total buoyancy ranging from 3t to 40t, more if required for specific usage – Either with a fixed through steel arrangement to distribute the forces from the mooring line or removable elements or bespoke steel work. Various options, elements, fixings are available.

     Coffre d'Amarrage à Axe incliné              Coffre d'Amarrage à Axe Incliné 

 

E) FLOATING BARRIER MOORING BUOY

Buoys of 0.7t to 2t of buoyancy, designed for the mooring of anti-intrusion or anti-pollution barriers. These buoys will have a horizontal frame so to attach the barriers on its side, also with the normal top and bottom mooring points.  Various options, elements, fixings are available.   

      Coffre d'Amarrage pour Barrage Flottant                      Coffre d'Amarrage pour Barrage Flottant 02 

 

II - GENERAL DATA

A) SPECIFICATION

OCEAN 3 mooring buoys are typically made from a core of Polyethylene (PE) foam which will recover its shape after compression, 100% closed cell of various densities depending on usage. Such foam will guaranty no water absorption in case of damage. It allows a compression of up to 60% of its original volume for short periods of time, to regain its shape, meaning they allow for energy absorption, such as a fender.    

The choice of the foam density relies on setting up the best parameters between weight and its ability to compress (as the higher the density the less the buoyancy will be).

A conical shape on the bottom part will allow it to be more stable in the water.

 

B) CALCULATION OF THE TENSION LINE MOORING FORCES

 

A calculation needs to be established as to working out the total force coming from the mooring line.

CALCUL DES TENSIONS D'AMARRE

 

Calculation of the angle of the buoy with the mooring line.

CALCULS DES TENSIONS 02        CALCULS DES TENSIONS 03

 

Calculation of the moorings with multiple anchor points.

AMARRAGE MULTIPLES Domaine d'utilisation Angulaire

 

C) DRAFT AND FREEBOARD CALCULATION

TA - TE 

The buoy with the mooring line weight is represented above. The draft / free board will change depending on the weight of the mooring line.

D) DEAD WEIGHT / SINKER

Corps Mort 01 Corps Mort 02

E) STABILITY CALCULATION

Having worked out the centre of gravity, we are able to represent the stability of the buoy when in full charge or without any moorings. All those figures have been calculated in 3d views.

Stability simulation in full charge from 10° to 90° angle

CALCULS DE STABILITÉ CALCULS DE STABILITÉ 01

Stability curves

Stabilité 03Stabilité 04

 

III - DESIGN OF STEEL PARTS

A) STRAIN CALCULATION

Définition Parties Métalliques 01     Mécanique 03

         Mécanique 04        Mécanique 05 

Strain Evaluations for the Steel Frames

 B) DESIGN OF STEEL FRAMES

   Puits de Chaîne   Axe métallique simple   Axe Métallique

 

IV - ACCESSORIES 

Foot rail continuous or in segments

Rambarde 01  Rambarde 02  Rambarde 03

 

Hand rails and lights/lanterns

Poignée 01 Poignée 02 Balise Lumineuse 01    

Decking steps 

Cale-pieds 01  Cale-pieds 02  Marches 01
 
 
 
Mooring hooks
 
Croc d'Amarrage 01 Croc d'Amarrage 02 Croc d'Amarrage 03 Croc d'Amarrage 04  
 
 
Markings, specific identifications
 
  Marquage 02   Marquage 01
 
Marquage 01 Marquage 02 Marquage 03
 
 
Signal : Lanterns/lights, radar reflector, reflective tape
 
Signalisation 01   Balises Lumineuses 02 Balises Lumineuses 03
 
Bande Réfléchissante 02 Réflecteur radar Signalisation 02
 
 

V - TESTS

 
Signal : Lanterns/lights, radar reflector, reflective tape
 
Essai d'Arrimage   Résistance à l'Avancement
 
 
Mooring Line Installation
 
          Ligne de Mouillage 01              Ligne de Mouillage 02
 
 
 
Installation
 
Mise à l'Eau 01 Mise à l'Eau 02 Mise à l'Eau 03
 
For further information on our mooring buoys :

LATEST REFERENCES ON MOORING BUOYS