Mooring Systems

EVA / Polyurea Boat Mooring and Navigation Buoys

The weaknesses of the traditional Steel Mooring Buoys and Navigation Buoys are rusty, worn out and bearing of pulling forces among the cylindrical structure of the Mooring Buoy. In case of ageing and/or collision, the Steel Mooring Buoys will be creaked, holed, sunk or even pulled apart during a heavy storm.

With the high technology support and availability of new material nowadays, the new developed Non-metal Mooring Buoys are either made in high-density Ethylene-co-Vinyl Acetate (EVA) and sprayed with several coats of Polyurea outside, or used Fiberglass Module (GRP) fitted with Reinforced Rubber Fender, then filled inside up with hard Polyurethane (PU). Despite the weight and size of an EVA / Polyurea Mooring Buoy is much less than a Steel Mooring Buoy under the same requirement, it is more long-lasting (10 years or more under normal usage) and maintenance-free for long term operation. Over a period of time, when marine barnacles found on the surface and underneath of an EVA / Polyurea Mooring Buoy, it can be easily flipped over 90 degrees on the surface and cleaned in place without removal and repainting. It really overcomes most of the previous problems on the Steel Mooring Buoys and significantly reduces the on-going maintenance costs. Colour Choice of Yellow / Green / Red is also available upon request.

EVA / Polyurea Mooring Buoys are available in two Versions: Middle Shaft Version (Middle Shaft with top and bottom Mooring Rings) and Through Chain Version (The Mooring Buoy with Hollow Structure that allows the Chain to go through). The idea of the Non-metal Mooring Buoys is to remove the stress (pulling forces) from the cylindrical body of the Mooring Buoy, thus, all the pulling forces will be directly taken over by the Middle Shaft or Mooring Chain and the Mooring Lines to the Boat, the Mooring Buoy itself only acts as a floatation unit to support the weight of the Mooring Chain and maintain about 33 – 50 % stays afloat on the surface as required. 

There are many choices of HDPE or EVA Buoys available in the market nowadays, it is true that the cylindrical body of an EVA / Polyurea Mooring Buoy will never get rusty and worn out, however, the Mooring Rings and the Middle Shaft that are made in galvanized mild steel may pull apart from the cylindrical body after a few years due to rusty and worn out. This is the reason why we designed and made all our EVA / Polyurea Mooring Buoys with all-in-ones Stainless Steel Middle Structures and sprayed with Polyurea for maintenance-free and long-lasting. Besides the Shaft problems, the design of some HDPE Buoys is too high, please take note that higher the Mooring Buoy afloat on the surface, higher the chance of titling sideway that causes the growth of marine barnacles and worn out on the top half of the Mooring Buoy.

Mooring Chain connects the Mooring Buoy to the Concrete Sinker underwater, but most of the Boat Owners did not get what they paid for! The material composition of the Mooring Chains makes a world difference in its pulling strength and durability although they all look the same. Mooring Chains (Stud Link, AM or Open Link, PM) are made by Forged Steel and are classified into Three Categories (Grade I, II and III). Grade I Chains are cheaper, but it corrodes much quicker in seawater condition and the pulling strength is 40 % less than the Grade II Chains. Grade II Chains with hot-dipped galvanized finishing (Stud or Open Link) and fitted with a standard Swivel at about one meter below the Mooring Buoy are the best choice for Boat Mooring Systems in open water condition. 

Kinetic Key Co. Ltd. (KKCL) established Production Lines in mainland China (PRC) and is a Professional Supplier for Mooring Components, such as Mooring Buoys, Mooring Chains, Swivels, Shackles and Concrete Sinkers etc., KKCL is more than capable to design, supply and install the full set of Mooring Systems to meet your Boat and HK Marine Department requirements upon request.

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EVA / Polyurea Boat Mooring and Navigation Buoys

The weaknesses of the traditional Steel Mooring Buoys and Navigation Buoys are rusty, worn out and bearing of pulling forces among the cylindrical structure of the Mooring Buoy. In case of ageing and/or collision, the Steel Mooring Buoys will be creaked, holed, sunk or even pulled apart during a heavy storm. 

With the high technology support and availability of new material nowadays, the new developed Non-metal Mooring Buoys are either made in high-density Ethylene-co-Vinyl Acetate (EVA) and sprayed with several coats of Polyurea outside, or used Fiberglass (GRPModule fitted with Reinforced Rubber Fender, then filled inside up with hard Polyurethane (PU). Despite the weight and size of an EVA / Polyurea Mooring Buoy is much less than a Steel Mooring Buoy under the same requirement, it is more long-lasting (10 years or more under normal usage) and maintenance-free for long term operation. Over a period of time, when marine barnacles found on the surface and underneath of an EVA / Polyurea Mooring Buoy, it can be easily flipped over 90 degrees on the surface and cleaned in place without removal and repainting. It really overcomes most of the previous problems on the Steel Mooring Buoys and significantly reduces the on-going maintenance costs. Colour Choice of Yellow / Green / Red is also available upon request.

EVA / Polyurea Mooring Buoys are available in two Versions: Middle Shaft Version (Middle Shaft with top and bottom Mooring Rings) and Through Chain Version (The Mooring Buoy with Hollow Structure that allows the Chain to go through). The idea of the Non-metal Mooring Buoys is to remove the stress (pulling forces) from the cylindrical body of the Mooring Buoy, thus, all the pulling forces will be directly taken over by the Middle Shaft or Mooring Chain and the Mooring Lines to the Boat, the Mooring Buoy itself only acts as a floatation unit to support the weight of the Mooring Chain and maintain about 33 – 50 % stays afloat on the surface as required. 

There are many choices of HDPE or EVA Buoys available in the market nowadays, it is true that the cylindrical body of an EVA / Polyurea Mooring Buoy will never get rusty and worn out, however, the Mooring Rings and the Middle Shaft that are made in galvanized mild steel may pull apart from the cylindrical body after a few years due to rusty and worn out. This is the reason why we designed and made all our EVA / Polyurea Mooring Buoys with all-in-ones Stainless Steel Middle Structures and sprayed with Polyurea for maintenance-free and long-lasting. Besides the Shaft problems, the design of some HDPE Buoys is too high, please take note that higher the Mooring Buoy afloat on the surface, higher the chance of titling sideway that causes the growth of marine barnacles and worn out on the top half of the Mooring Buoy. 

Mooring Chain connects the Mooring Buoy to the Concrete Sinker underwater, but most of the Boat Owners did not get what they paid for! The material composition of the Mooring Chains makes a world difference in its pulling strength and durability although they look the sameMooring Chains (Stud Link, AM or Open Link, PM) are made by Forged Steel and are classified into Three Categories (Grade I, II and III). Grade I Chains are cheaper, but it corrodes much quicker in seawater condition and the pulling strength is 40 % less than the Grade II Chains. Grade II Chains with hot-dipped galvanized finishing (Stud or Open Link) and fitted with a standard Swivel at about one meter below the Mooring Buoy are the best choice for Boat Mooring Systems in open water condition.

Kinetic Key Co. Ltd. (KKCL) established Production Lines in mainland China (PRC) and is a Professional Supplier for Mooring Components, such as Mooring Buoys, Mooring Chains, Swivels, Shackles and Concrete Sinkers etc., KKCL is more than capable to design, supply and install the full set of Mooring Systems to meet your Boat and HK Marine Department requirements upon request.

 
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EVA / Polyurea Mooring Buoys Vs Traditional Steel Mooring Buoys

Item

Considerations

EVA / Polyurea Mooring Buoys

Traditional Steel Mooring Buoys

1.

Rusty and Worn Out

EVA / Polyurea Mooring Buoy will never get rusty and worn out. The top and bottom Mooring Rings and its Middle Structure are all-in-ones made by Stainless Steel, no painting is required, the chance of getting rusty and worn out is much less than normal steel. A Steel Mooring Buoy and its top and bottom Mooring Rings that made in mild steel will require continuous maintenance including removal, repairing, anti-rust / anti-fouling painting and replacement almost every two years.

2.

Pulling Forces

Bearing of all pulling forces directly by the Middle Shaft. The Mooring Buoy itself only acts as a floatation unit to support the weight of the Mooring Chain and maintain 33 – 50 % stays afloat on the surface as required. Bearing of pulling forces among the cylindrical steel structure of the Mooring Buoy. In case of ageing or lack of maintenance, it may be creaked, holed, sunk or pulled apart during a heavy storm.

3.

Collision

The cylindrical body of an EVA / Polyurea Mooring Buoy is soft, light-weight and high abrasive material, in case of collision, the impact forces will be much reduced and made no damage to the Boat. Damages to the Steel Mooring Buoy and the Boat even in a minor collision.

4.

Weight

An EVA / Polyurea Mooring Buoy of 1.0 meter in Diameter only weighs about 120 Kg. The Mooring Buoy’s material is light-weight (buoyant), long-lasting and maintenance-free. A Steel Mooring Buoy of 1.0 meter in Diameter weights about 550 Kg. The Mooring Buoy’s material is heavy steel, in case of ageing/damages (cracked and holed) it will sink, unless it had been filled with Styrofoam inside, but it will require additional costs and procedures.

5.

Buoyancy

The weight of a Mooring Chain 25 mm x 12 meters long is about 170 Kg (downward force). In order to maintain 33 – 50 % of the Mooring Buoy stays afloat on the surface as required, an EVA / Polyurea Mooring Buoy of 0.8 meter in Diameter only needs 0.8 meter in Height to offset the downward forces and maintain about 0.4 meter stays afloat on the surface. In order to maintain 33 – 50 % of the Mooring Buoy stays afloat on the surface as required, a Steel Mooring Buoy of 1.0 meter in Diameter needs about 1.2 meters in Height to offset the downward forces and maintain about 0.6 meter stays afloat on the surface.
Higher the Mooring Buoy afloat on the surface, higher the chance of titling sideway that causes the growth of marine barnacles and worn out on the top half of the Mooring Buoy.

6.

Maintenance and Durability

An EVA / Polyurea Mooring Buoy will never get rusty, worn out and it is very light-weight, over a period of time, when marine barnacles found on the surface and underneath of the Mooring Buoy, it can be easily flipped over 90 degrees on the surface and cleaned in place without removal and repainting. EVA / Polyurea Mooring Buoy is long-lasting and maintenance-free, it may last for 10 years or more under normal usage without extensive care. Over a period of time, when rusty and marine barnacles found on the surface and underneath of a Steel Mooring Buoy, additional costs will be required for removal, cleaning, repairing, repainting and replacement. Even under reasonable good maintenance, a Steel Mooring Buoy may only last for about 5 years.

EVA / Polyurea Buoys Vs Traditional Steel Buoys

Item Considerations EVA / Polyurea
Mooring Buoys
Traditional Steel
Mooring Buoys

1.

Rusty and Worn Out

EVA / Polyurea Mooring Buoy will never get rusty and worn out. The top and bottom Mooring Rings and its Middle Structure are all-in-ones made by Stainless Steel, no painting is required, the chance of getting rusty and worn out is much less than normal steel. A Steel Mooring Buoy and its top and bottom Mooring Rings that are made with mild steel will require continuous maintenance including removal, repairing, anti-rust / anti-fouling painting and replacement almost every two years.

2.

Pulling Forces

Bearing of all pulling forces directly by the Middle Shaft. The Mooring Buoy itself only acts as a floatation unit to support the weight of the Mooring Chain and maintain 33 – 50 % stays afloat on the surface as required. Bearing of pulling forces among the cylindrical steel structure of the Mooring Buoy. In case of ageing or lack of maintenance, it may be creaked, holed, sunk or pulled apart during a heavy storm.

3.

Collision

The cylindrical body of an EVA / Polyurea Mooring Buoy is soft, light-weight and high abrasive material, in case of collision, the impact forces will be much reduced and made no damage to the Boat. Damages to the Steel Mooring Buoy and the Boat even in a minor collision.

4.

Weight

An EVA / Polyurea Mooring Buoy of 1.0 meter in Diameter only weighs about 120 Kg. The Mooring Buoy’s material is light-weight (buoyant), long-lasting and maintenance-free. A Steel Mooring Buoy of 1.0 meter in Diameter weights about 550 Kg. The Mooring Buoy’s material is heavy steel, in case of ageing/damages (cracked and holed) it will sink, unless it had been filled with Styrofoam inside, but it will require additional costs and procedures.

5.

Buoyancy

The weight of a Mooring Chain 25 mm x 12 meters long is about 170 Kg (downward force). In order to maintain 33 – 50 % of the Mooring Buoy stays afloat on the surface as required, an EVA / Polyurea Mooring Buoy of 0.8 meter in Diameter only needs 0.8 meter in Height to offset the downward forces and maintain about 0.4 meter stays afloat on the surface. In order to maintain 33 – 50 % of the Mooring Buoy stays afloat on the surface as required, a Steel Mooring Buoy of 1.0 meter in Diameter needs about 1.2 meters in Height to offset the downward forces and maintain about 0.6 meter stays afloat on the surface.
Higher the Mooring Buoy afloat on the surface, higher the chance of titling sideway that causes the growth of marine barnacles and worn out on the top half of the Mooring Buoy.

6.

Maintenance and Durability

An EVA / Polyurea Mooring Buoy will never get rusty, worn out and it is very light-weight, over a period of time, when marine barnacles found on the surface and underneath of the Mooring Buoy, it can be easily flipped over 90 degrees on the surface and cleaned in place without removal and repainting. An EVA / Polyurea Mooring Buoy is long-lasting and maintenance-free, it may last for 10 years or more under normal usage without extensive care. Over a period of time, when rusty and marine barnacles found on the surface and underneath of a Steel Mooring Buoy, additional costs will be required for removal, cleaning, repairing, repainting and replacement. Even under reasonable good maintenance, a Steel Mooring Buoy may only last for about 5 years.

Manufacturing of the Non-metal Mooring Buoys / Navigation Buoys

All Non-metal Mooring Buoys and Navigation Buoys are tailor-made at our Factories in mainland China (PRC) based on individual needs and requirements of the Hong Kong Marine DepartmentThe manufacturing processes of the EVA / Polyurea Middle Shaft Mooring Buoys, Marie Department Wreck Buoys and GRP / PU Through Chain Mooring Buoys are:

  Firstly, assembly of the Pre-cast EVA with the all-in-ones Stainless Steel Middle Shaft or Fiberglass (GRP) Module with Stainless Steel Hollow Structure to form the size of the required Mooring / Navigation Buoy.
  Secondly, spray the EVA cylindrical body with several coats of Polyurea that mixed with the desired colour by Computerized Spraying System. Polyurea is a newly developed material that is very high abrasive, heat resistant and never worn out; it will dry immediately upon spraying.
For Fiberglass (GRP) Through Chain Buoys, first, install the Reinforced Rubber Fenders, then fill up the GRP Module completely with hard Polyurethane (PU) inside. A Stainless Steel Mooring Ring will be paired up with each Mooring Buoy for Chain connection.
  Finally, dress up, marking of Buoy Numbers, Anti-fouling painting and pack up for delivery.

Manufacturing of the Non-metal Mooring Buoys / Navigation Buoys

All Non-metal Mooring Buoys and Navigation Buoys are tailor-made at our Factories in mainland China (PRC) based on individual needs and requirements of the Hong Kong Marine Department

The manufacturing processes of the EVA / Polyurea Middle Shaft Mooring Buoys, Marine Department Wreck Buoys and GRP / PU Through Chain Mooring Buoys are:

  Firstly, assembly of the Pre-cast EVA with the all-in-ones Stainless Steel Middle Shaft or Fiberglass (GRP) Module with Stainless Steel Hollow Structure to form the size of the required Mooring / Navigation Buoy.
  Secondly, spray the EVA cylindrical body with several coats of Polyurea that mixed with the desired colour by Computerized Spraying System. Polyurea is a newly developed material that is very high abrasive, heat resistant and never worn out; it will dry immediately upon spraying.
For Fiberglass (GRP) Through Chain Buoys, first, install the 
Reinforced Rubber Fenders, then fill up the GRP Module completely with hard Polyurethane (PU) inside. A Stainless Steel Mooring Ring will be paired up with each Mooring Buoy for Chain connection.
  Finally, dress up, marking of Buoy Numbers, Anti-fouling painting and pack up for delivery.

Boat Mooring Requirements in Hong Kong

The size of a Mooring System is dependent upon the total length of the Boat, the size of the Mooring Chains and the weight of the Concrete Sinkers to be used will normally be listed in the Letter of Permission from the Hong Kong Marine Department. The size and the type of Mooring Buoy will not be specified, however, the requirement is the Mooring Buoys should have sufficient buoyancy to support the weight of the Chain at fullest stretch and should be 33 – 50 % greater than the combined weight of the suspended components (i.e. 1/3 – 1/2 of the Buoy stay afloat on the surface after it has been chained up).

Generally, a Boat of total length between 5 – 8 meters, will use Chain size 12 – 18 mm, a Mooring Buoy of 0.6 meter in Diameter will be used; a Boat of total length between 9 – 11 meters will use Chain size 25 – 32 mm, a Mooring Buoy of 0.7 – 0.8 meter in Diameter will be required. A Boat of total length between 11 – 26 meters will use Chain size 32 – 40 mm, a Mooring Buoy of 1.0 meter in Diameter will be required; a Boat of total length between 24 – 41 meters will use Chain size 40 – 45 mm, a Mooring Buoy of 1.1 – 1.2 meters in Diameter will be used. A Boat of total length 42 – 56 meters will use Chain size 50 mm, a Mooring Buoy of 1.3 meters in Diameter will be required. The EVA / Polyurea Mooring Buoy with Stainless Steel Middle Shaft is very light-weight (buoyant), never get rusty and worn out, no painting is required, it may last for 10 years or more under normal usage without extensive care.

With our fully equipped Production Lines in mainland China (PRC), the cost of making an EVA / Polyurea Mooring Buoy with all-in-ones Stainless Steel Middle Structures is very compatible to those Steel Mooring Buoys that needed to be filled with Styrofoam inside and fully moulded with Fiberglass outside, but the durability and maintenance-free is much better.

Samples of the EVA / Polyurea Mooring Buoy are available at our Warehouse at Fo Tan, Shatin for your inspection and hands-on experience upon request. 

For inquiry, please contact Mr. Li on (852) 6952 8400 or (86) 138 2522 3300 or E-mail kkli@kkcl.com.hk. We are more than capable to design, supply and install the full sets of Mooring Systems to meet your Boat and HK Marine Department requirements upon request.


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Boat Mooring Requirements in Hong Kong

The size of a Mooring System is dependent upon the total length of the Boat, the size of the Mooring Chains and the weight of the Concrete Sinkers to be used will normally be listed in the Letter of Permission from the Hong Kong Marine Department. The size and the type of Mooring Buoy will not be specified, however, the requirement is the Mooring Buoys should have sufficient buoyancy to support the weight of the Chain at fullest stretch and should be 33 – 50 % greater than the combined weight of the suspended components (i.e. 1/3 – 1/2 of the Buoy stay afloat on the surface after it has been chained up).

Generally, a Boat of total length between 5 – 8 meters, will use Chain size 12 – 18 mm, a Mooring Buoy of 0.6 meter in Diameter will be used; a Boat of total length between 9 – 11 meters will use Chain size 25 – 32 mm, a Mooring Buoy of 0.7 – 0.8 meter in Diameter will be required. A Boat of total length between 11 – 26 meters will use Chain size 32 – 40 mm, a Mooring Buoy of 1.0 meter in Diameter will be required; a Boat of total length between 24 – 41 meters will use Chain size 40 – 45 mm, a Mooring Buoy of 1.1 – 1.2 meters in Diameter will be used. A Boat of total length 42 – 56 meters will use Chain size 50 mm, a Mooring Buoy of 1.3 meters in Diameter will be required. The EVA / Polyurea Mooring Buoy with Stainless Steel Middle Shaft is very light-weight (buoyant), never get rusty and worn out, no painting is required, it may last for 10 years or more under normal usage without extensive care.

With our fully equipped Production Lines in mainland China (PRC), the cost of making an EVA / Polyurea Mooring Buoy with all-in-ones Stainless Steel Middle Structures is very compatible to those Steel Mooring Buoys that needed to be filled with Styrofoam inside and fully moulded with Fiberglass outside, but the durability and maintenance-free is much better.

Samples of the EVA / Polyurea Mooring Buoy are available at our Warehouse at Fo Tan, Shatin for your inspection and hands-on experience upon request. 

For inquiry, please contact Mr. Li on (852) 6952 8400 or (86) 138 2522 3300 or E-mail kkli@kkcl.com.hk. We are more than capable to design, supply and install the full sets of Mooring Systems to meet your Boat and HK Marine Department requirements upon request.