An anchor is a vital part of the boat and is one of the most widely used items in the marine industry.”. The anchor is used to protect your boat. It is synonymous with durability and resistance to bursting. The type of bottom—mud, grass, sand or rock—will dictate different choices of anchors, as will the size and windage of the marine, the wind conditions and the sea state When choosing an anchor for your boat, it is paramount to consider both your length of the boat, the weight of boat and weather conditions in your area.
Which style or category of anchor?
Choose between the two most common anchor styles, the fluke and the plow, or if you are marineing in a small marine, on protected inland waters, the inland type.
The most popular type of anchor is the fluke anchor, also called the Lightweight or Danforth anchor, which includes the West Marine Traditional and Performance2 anchors and is often the only anchor on many smaller marines. Light and easy to weigh, it stows flat and holds well in mud or sand. Its excellent holding power-to-weight ratio means you can use a lighter anchor compared to other types, but it doesn’t hold well in grassy or rocky surfaces. Its flukes and stock (the wide crossbar at the top) are more prone to foul on rocks or the anchor rode.
Plow and Scoop anchors—the “single point” style represented by the Manson Supreme, Rocna, CQR, Delta and Claw—have the best all-around holding ability in varying bottom conditions. They generally reset themselves easily if the wind or current changes direction. The newest “scoop” designs, like the Manson and Rocna anchors, include round “roll bars” that self-right the anchor, automatically turning it right side up.
Plow/scoop anchors hold more effectively in grass, mud and sand. They do not have projecting flukes that foul easily, but their shape makes stowing them more awkward (a bow-roller or bowsprit is the best solution). Heavier powermarines and cruising sailmarines often use plows as primary anchors.
For the greatest anchoring security, you should carry two anchors of different styles, one each of the Danforth style and the plow/scoop variety. The type of bottom—mud, grass, sand or rock—will dictate different choices of anchors, as will the size and windage of the marine, the wind conditions and the sea state. Some anchoring situations also call for more than one anchor to be used simultaneously.
YSmarines is one of the leading marine anchor suppliers with high performance, beautiful design with various colors and maximum protection for boats, which can provide the anchor in a wide variety of types to meet customer's requirements.
Rubber fenders are developed in a wide range of variations to serve different applications. Rubber Fenders decrease the input reaction force and provide requisite angular guidance to the hull pressure. These are the fenders which have the highest market demand. These fenders also have a positive impact on rubber industries round the globe. There noticed a great advancement and growth of the rubber industry due to marine application of rubber in last ten years. There are many types of marine rubber fenders, manufactured by different shipping accessory companies, which are detailed as follows:
Super Cone Fenders: These are the latest sort of rubber fenders and generally referred as “Cone Fenders”. The conical body of the cone fenders keeps them stabilised at even higher values of compression angles. They are highly efficient and provide optimum performance. They have better resistance to shear and over-compression. Their geometry plays a significant role in their stability. Today, rubber compounds find their widespread application in marine industry and extensively used for the manufacturing of Cone Fenders.
Cylindrical Fenders:They are the most basic and common fender systems used in today’s times. They can be used for all types of marine marines and ships and they are quite economical too when the aspect of fitting them up is taken into account.
These are easy to install, widely used fenders with simpler design. They can serve to both large as well as small vessels. As per the requirement of cylindrical fenders, these are available in three size categories: Small Cylindrical Fenders, Intermediate Cylindrical Fenders and Large Cylindrical Fenders. These fenders are economical and have thick walls which can efficiently resist wear, abrasion and higher loads.
Pneumatic Fenders: pneumatic fenders are the ideal choice for inter ship dealings and port accessories. Their deployment is quick and robust. At the time of docking the pneumatic fenders minimize the risk of damage and safeguards both people and cargo. These fenders should comply with quality assurance guidelines of ISO issued in 2014. These are of five types namely: chain-tire net (CTN) pneumatic fenders; Sling type fenders; low-pressure pneumatic fenders; hydo-pneumatic fenders and. The CTN pneumatic fender has a network of tyres connected with chains in horizontal as well as vertical directions to protect the fender body. As the chains remains in water all the time so must be made up of corrosion-resistant galvanized materials. These are the simplest and cheaper types of marine rubber fenders which increases the clearance between the structure and the hull to a larger extent. Sling type pneumatic fenders are similar to chain type fenders with the only difference that fenders can be slung with even ropes made up of meshed wire strands than chains. Low pressure pneumatic fenders are the type of pneumatic fenders which deliver minimum pressure to the hull by absorbing kinetic energy to a maximum extent by providing maximum contact surface. Hydro-pneumatic Fenders: These are the pneumatic fenders which are made in compliance to the need of fender.
W Fenders: W fenders are used mainly to aid the larger ships and marines because they offer a high rate of resistance and thus better protection to the water-crafts in case of any accident occurring.
These marine rubber fenders should be capable of serving to all their commitments in all environmental conditions. The marine rubber fenders should be durable and they are designed to serve a longer period of time. So durability and strength are the main factors for selection of any kind of fender.
The production of marine rubber fenders has moved from the manufacturers that developed them to lower-cost producers, with no heritage knowledge of the products they currently make. This has created a disjoint between the manufacturers and the people that design and sell the end products. Complicating matters, there are no true standards governing the ‘nuts and bolts’ of fender design. There is little to assist in the design of cost-effective fenders. Furthermore, there is little understanding of neither what actually causes fenders to fail, nor how buyers can optimize their fender lifetimes.
Standards are of little practical help
The bad news for those looking to invest in new fenders is that the most critical issues for successful rubber marine rubber fenders are not covered in any standard. Current standards and guidelines deal primarily with broad theories and virtually not at all with the simple details that make virtually all the difference between troublesome and robust designs.
The only extant standards deal with these general theories, the proprietary design of specific rubber fender elements (not the entire fender), and/or the assessment of the energy capacity of fender elements. The most widely used guideline for the design of fender systems is Guidelines for the Design of Fenders (sic) Systems: 2002, published by the International Navigation Association (PIANC). It gives guidelines for determining energy requirements, but no details of how to design a fender system. Its six-page Appendix A, ‘Procedure to Determine and Report the Performance of marine rubber fenders’ is the only section of this seventy page document familiar to most fender specifiers. However, not only is Guidelines…not a standard, but due to errors in the final editing process, two critical sections were reversed. The result is that for the majority of testers a critical part of the procedure description is likely unintelligible. Thus, its actual usefulness is limited.
This is not as much of a problem as it otherwise would be, because the same year Gudelines… was published, ASTM International, the largest standards-writing organization in the world, issued Standard F 2192, ‘Standard Test Method for Determining and Reporting the Berthing Energy and Reaction of marine rubber fenders’. An important revision was issued in 2005. This is the document that the performance testing part of Appendix A was intended to be, and it is the only standard for determining the performance of marine rubber fenders.
ISO 9000 certification is not necessarily any assurance. Achieving ISO 9000 status requires that a manufacturer produce a consistently-repeatable product, and document it, but does not require that it make a product that is fit for service. On balance, it is better than nothing but not a magic bullet.
My own experience has led me to believe strongly that all the worry about measuring fender energy and reaction is a tempest in a teapot. Investigations of many fender problems, multiple types and manufacturers show that inadequate fender performance (energy and reaction) is almost never the primary cause of fender problems.
Also, seldom is fender compression deflection a cause of fender failure. Often specifications stipulate that fender deflection shall not exceed a certain percent of undeflected height (for durability concerns). Actually, fenders designed to have a greater rated deflection operate at a lower strain and stress level than ones designed to deflect less.
Specifying rubber
The ultimate useful life potential of any rubber product is controlled by its chemistry. Aging and ozone resistance of the rubber, from which fender elements are molded, are two of the most important criteria that determine useful life potential. Most fender specifications don’t specify rubber ozone resistance at all, and many specify an acceptable aging resistance that is considerably lower than it could be for maybe one percent higher cost.v
For more professional information, please visit the page of ysmarines.com.
The main aim of installing marine rubber fender is to protect both the vessel and the dock from major failure during the berthing period. External forces, such as abrasion or other natural factors can possibly occur during the berthing process. Therefore, marine rubber fenders are made to solve this problem, and therefore, more money can be saved due to less vessel or dock fixing.
Rubber fenders are designed to absorb the energy that a vessel transfers to a berthing structure, hence the term energy absorption, so that the amount of energy received by the dock is much less compared to when fenders are absent. The force that is bounced back and relieved by the dock through the fender is called reaction force. A good quality marine fender can be determined by measuring the energy absorption and reaction force. A good quality marine fender has a high energy absorption and the low reaction force, hence the reduced impact yielded from the vessel to the dock, as well as the minimized impact bounced back from the dock to vessel.
There are a lot of fender types that can be used on the port, for instance: cylindrical fender, V-type, A-type, M-type, super cell, and super cone fender. Tugboat fenders, however, are installed on tugboats to protect vessels from major failure in the incidence of a crash. In order to achieve the best result, there are several factors that to consider in choosing the right type of marine rubber fender, namely the dimension of berthing vessels, the type of the port, situation around the port and the existence tugboat to guide the vessel while berthing.
1. Vessel dimensions
Vessel dimensions, in terms of type and dead weight tonnage, become significant factors in choosing not only the right fender type, but also the size of the fender. The larger the vessel, the larger the required fenders will be. Usually, fenders which are equipped by frontal frames are chosen as they have large contact area. From the economical perspective, V-type fender can be one of the options. However, to yield the maximum result, super cell and super cone fender are selected. For the ports that are used for the small to medium vessel, the type A, V, M, LMD or cylindrical are chosen to protect the port wall.
2. Type of the port
Another significant factor that can influence in choosing the right type of fender is the type of the port. Based on the location and position of the port, there are several port structures that are usually used including dolphin, monopile, jetty and quay wall. In the dolphin terminal, the terminal consists of poles that are used for vessels to berth. Rubber fender that is usually used in this terminal is super cell fender. However, jetty terminal, which is also known as floating terminal, does not need a really tough construction as it floats. This terminal is used for passenger ships. Unlike other kinds of ports, terminals with quay wall consists of concrete structure which parallels the beach. Large vessels cannot berth on this terminal due to the shallow waters in which the terminals are usually located.
3. Marine environment
The marine environment, such as high and low tides of the seawater, the power of wind which influences the waves, is another factor that needs to be considered in choosing the right fender type and dimension. If there is a big difference between the high and low tides, elongated fenders must be chosen, especially when the port is used by diversely sized vessels. If a small vessel needs to berth during the low tide, it can still berth to this port. Therefore, it is recommended to have the fenders installed in vertical position. On the other hand, when the sea is windy and wavy, the water also gets rough. This causes vessels to bump into the port wall. Elongated V type fender, super cell or super cone fender equipped by frontal frames can be used for this type of port.
4. The availability of guidance during berthing process
The availability of tugboats during berthing process is very important in order to avoid vessels from crashing into the port wall. This is because the speed of the vessel and the berthing angle can be adjusted as the vessel moves closer to the port.
YSmarines has introduced the marine mooring chock which is a mooring system that is designed to support safe and reliable moorings of all types and purpose through its patented low friction technology.
The transition from steel wire rope to fiber rope is widespread across industry. Fiber rope has a good strength to weight ratio and ease of handling, resulting in much lower risk of injury.
Although advantageous, a major weakness of fiber rope is poor resistance to external abuse and abrasion through everyday operations and poor surface contact. Abrasion continues to be one of the most common root causes of rope failure and reduction in its residual strength.
It is impossible for the synthetic rope to perform to its maximum capabilities when used with poorly maintained deck equipment, often rusted or with a rough surface finish. Rope manufacturers recommend surfaces are correctly prepared, maintained and routinely inspected before and after rope installation. A 300-microinch (7.62-microns) finish is recommended for all deck hardware which comes into contact with the rope, in addition to the avoidance of chocks heavily scored from previous wire rope use.
The YSmarines marine mooring chock is said to provide vessels with the ability to be moored with greater safety, performance, and efficiency.
The marine mooring technology is said to provide vessels with the ability to be moored with greater safety, performance and efficiency, offering multiple benefits. The marine mooring chock is versatile and capable of being fitted to brand new vessels and retro fitted to existing chocks and Panama fairleads with no hot works or dry docking required.
Increased safety is a feature of the marine mooring chock which reduces rope wear and abrasion, reducing the risk of breaking or failure. There is also no need for crew members to be near mooring lines under tension, as minimal (if any) chafe protection is required following the installation of the new system.
The marine mooring chock’s smooth surface and finish and its material characteristics provide better equalization of mooring loads, especially when in the high swell. The self-lubricating, low friction marine mooring chock material requires little or no maintenance and no painting, coating or external protection. Corrosion-resistant materials technology is featured on the new system, providing protection against the arduous environments faced in the global maritime industry.
Custom manufactured from initial chemistry to end product, the marine mooring chock is available for use on all chock and vessel sizes. Developed to optimize and enhance vessel moorings, much of the advantages derived from the unique materials technology developed through over 20 years of field experience in design, testing and material selection with fiber ropes.
The featured materials technology in YSmarines marine mooring chocks allow for the accommodation of HMPE fibre rope with lower risk of abrasion and wear when in contact with the Panama chock. The marine mooring chock is also suitable for polyester/polypropylene, polyester and nylon ropes, as required for FLNG, FSRU and STS where a specific synthetic pennant may pass through the fairlead. In all cases, due care and attention are required in relation to the loads involved, chock designs and rope sizes.