The Need For Effective Mooring Analysis

[Posted on August 27th 2014 by Bill Stewart]

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Whether you are in the gas and oil industry and involved in establishing large rigs in the middle of the ocean or something much smaller, you need to know about mooring analysis, what it is, and why it is important. You can eliminate a variety of problems by having sufficient analysis in front of you.

Various maritime accidents happen every year because people go out onto the water without doing their homework first. They don’t know about what a mooring is and how to choose one that is going to handle the weight of their rig based upon water conditions.

Whether you are building a mooring or you are using one that is pre-existing, it’s important to get mooring analysis conducted so that you know about the environmental conditions. If you are not going to drop an anchor, using a mooring is one of the few ways that you can stay where you are in the water. If you do not have the necessary information available, you could make mistakes that could damage your boat, your rig, and risk the safety of you and everyone out on the water.

It is important to know about anchoring versus mooring to help you determine which one is needed. Particularly when you are in the gas and oil industry and you have flexible risers to deal with as well, you want to make sure you have what is needed to keep your rig in place.

There are various ways to get the mooring analysis that you require. You can choose to hire engineers and buy advanced software to do all of the research and analysis on your own. You can also choose a third party that can provide you with the analysis as well as their recommendations. The latter is often more affordable and can ensure that you have the details that are required without any kind of bias.

Particularly when you are out on the open seas where it’s hard for emergency personnel to get to you quickly in the event of an accident, you want to make sure you do all of the analysis properly so that you can avoid problems. Having a third party conduct the analysis is advantageous because you know that it is getting done properly and no one is trying to cover up the shortcomings of someone else – which has happened throughout history.

Your vessel has to stay where it is intended when you are on the water. If you cannot anchor due to depth or because of other conditions, using a mooring is your only other option. To avoid mistakes, accidents, or anything else, it is best to order a mooring analysis so you know what potential issues you are dealing with and can take the appropriate actions to prevent any problems from happening out on the water.

Understand Marine Accident Investigation

[Posted on August 20th 2014 by Bill Stewart]

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Marine Accident Investigation is the process in which marine accidents involving ships or any other marine vessels are systematically examined and investigated in order to find out the cause of the accident. Causes of marine accidents include explosion or collision and human error. The purpose of the investigation is to propose how such accidents can be avoided in the future.

If any accident occurs, the national administration assigns their expert investigators to carry out a Marine Accident Investigation. This is done by interviewing the witnesses, collecting evidence and information for analysis to find out the likely cause of the accident. The result of the accident investigation and proposal is proposed in the final report to the public in order to prevent any occurrence of such accident in the future.

International Maritime Organization requires that all states that have registered ships to thoroughly examine and report any severe accidents that take place in the waters. The voyage data recorder is nowadays fitted on ocean moving crafts in accordance to the international maritime organization requirement.

The voyage data recorder has contributed immensely to the understanding of the causes of marine accidents. It also has contributed to the advancements of marine safety measures. The recorded information has assisted accident investigators in rebuilding happenings of an accident, finding out its cause, and how it can be avoided.

How Stewart Technology Associates helps in investigating marine accidents

Stewart Technology Associates is an agency that offers software, professional testimony and engineering services to various clients in the United States. Detailed Marine Accident Investigation service is provided by Stewart Technology Associates.

It is undoubtedly sad when marine accidents occur. In many cases, the accidents usually bring about a huge amount of destruction. Due to this, an investigation needs to be done in order to answer many questions like: how did the accident happen? Who was responsible?

When an accident takes place, Stewart Technology Associates is always available to carry out the investigation to determine its cause. It does not matter where the accident happened; the president of Stewart Technology Associates and his professional team can be relied on to do a detailed investigation to determine the exact cause of the accident, the liable party and whether any improvements can be made to avoid the same accident from happening again in the future.

Mooring investigation assists in investigating causes of marine accidents

Mooring refers to any permanent construction to which a vessel may be held. Mooring Analysis is whereby a body or a group of bodies which are associated to the floor of the sea by catenary lines system are analyzed. The main function of these lines is to hold the body in a practical vicinity of a marked location.

Mooring systems help in thorough investigation about the causes of marine accidents. The investigation is essential as it is used to find out the cause of the accident and the responsible party. The correctness of mooring ropes, cargo hoses, steel wire, chain, and other factors are evaluated as part of collection of evidence.

How Hydrodynamic Analysis Can Fit Your Marine Needs

[Posted on August 13th 2014 by Bill Stewart]

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Whether you’re sailing a boat, buying coastal property, or planning coastal city development, a good understanding of marine conditions and variables is essential. At Stewart Technology Associates, we have the resources to perform a detailed hydrodynamic analysis of your local waterways, providing you with all the information you need for marine success.

Hydrodynamic analysis is the evaluation of marine environments, with a specific focus on water movement, salinity, and temperature. Analysts begin by researching the environment in question. The more detailed and comprehensive the data they gather, the more accurate their analysis will be.

Once the data is gathered, it is fed into a model, which evaluates all marine conditions and determines how they will interact with each other. Originally, analysts built physical models of the ecosystem, but with the advent of computers, most analysis companies now rely on digital models. The models identify trends in marine conditions and make predictions for future changes in the marine environment. At Stewart Technology, we use OrcaFlex, one of the best marine analysis programs on the market. The models are then made available for coastal developers, who can plan their future boating and construction endeavors around them.

How is hydrodynamic analysis useful?

We preform these analyses to help coastal communities avoid environmental and public health threats. Many of the most dangerous water-borne diseases and predators are sensitive to particular environmental conditions. For example, sea nettles, a type of dangerous jellyfish, can only live in moderately salty water that is twenty degrees Celsius or warmer. Our analysts can predict the likely locations of sea nettles, as well as the times of year when they are likely to appear, making it easier for swimmers to avoid these animals.

Our analysts can also help coastal developers measure and moderate their impact on the environment. Say runoff from a proposed road will change the heat and nutrient content of local waterways, increasing the number of algal blooms. By researching hydrodynamic conditions, we can determine the likely size of these blooms, as well as their likely damage to the local economy and environment. Developers can then decide whether the proposed road is worth the environmental cost.

Coastal developers who have effectively analyzed hydrodynamic conditions can plan more enduring construction projects. With have enough information, we can tell developers the full range of the region’s tides, as well as any other information that might affect coastal structures. This will help the developers to design structures that will survive for years, or even decades.

Finally, during a marine accident investigation, authorities must analyze hydrodynamic factors to determine the cause of the accident. Parties responsible for boating accidents often attribute the accidents to marine conditions rather than to their own negligence. We can assess the dangers of the site where the accident occurred and determine whether hydrodyanmic factors could plausibly have caused the accident.

Learning More about Flexible Risers

[Posted on August 6th 2014 by Bill Stewart]

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Flexible risers are pipes used to relocate materials from the floor of the sea to the production and drilling structures that are on top of the water surface or from the structures to the sea floor. There are various types of risers, including pull tube risers, attached risers, rise towers, steel catenary risers, flexible riser and drilling risers.  Whether they are helping as export, import or production vehicles, risers are the linking between the production and drilling facilities and the subsea field developments.

Just like flow lines and pipelines, risers carry production materials like gas lift, control fluids and injection fluids as well as hydrocarbons. The risers are generally insulated to tolerate the temperatures at the sea floor. They are also either flexible or rigid.

Types of Risers

Attached riser-they were the first risers to be developed. They are positioned on compliant towers, concrete gravity structures and fixed platforms.

Pull tube risers- they are used on fixed structures. They are flow lines or pipelines that are wound up at the facility’s center. A pull tube with a wide diameter than the riser is preinstalled on the facility. A rope that has a wire is attached to the pipeline on the floor of the sea. The line is pulled through the tube to the top.

Steel catenary risers– they are used to join the sea floor to the production structures above the sea floor. They also join two floating platforms of production.

Top tensioned risers-they are vertical risers that terminate directly below the facility. They can move crossways with the waves and winds. The rigid risers are fixed to the floor of the sea.

Rise towers- they are built to lift the risers to a considerable height to reach the surface of the water. They are designed for extremely deep water environment.

Drilling risers- they transfer mud to the top during activities that constitute drilling. They connect the wellbore temporarily to the surface to avoid fluids from drilling activities from leaking into the water. Flexible risers are connected to the vertical risers and to the structures above.

Flexible risers– they can accommodate various situations. They can withstand both horizontal and vertical movement. This makes them perfect for use with floating structures. The flexible pipe was initially used to join production apparatus onboard floating equipment to export and production risers. They are also found as a primary user. There are various shapes of such risers. Examples are like the steep S and Z, steep wave and lazy wave that use fastened buoyancy modules.

The risers are being seized by metallic systems in several current deep water expansions.  Flexible pipe has been an effective key for both shallow and deep water flow line and water riser systems in the whole world.  In such uses the flexible pipe section can be used along the whole riser length or it can be limited to short dynamic sections such as jumpers. A hydrodynamic analysis is used to solve difficult problems in the marine environment where the risers cannot.

Stewart technology associates has developed and enhanced the risers to answer the challenges posed by steel catenary risers. These improved methods are applied to flexible pipe allowing effective response of the flexible pipes under the most simple and difficult loading conditions.

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