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Get the Right Service Using Hydrodynamic Analysis

[Posted on February 26th 2014 by Bill Stewart]

A large part of marine technology consultancy when offering services comes in the hydrodynamic analysis. Marine engineering as a broad discipline has to do with ships and rigs. Hydro means water, and dynamics means the forces and torque caused from the movement of water. Liquids in motion in the case water makes for wear and tear on ships and structures in marine environments.

Handling the Pressure

A basic course in physics will teach the ins and outs of fluid dynamics. Fluid dynamics comes as the basis of hydrodynamic analysis. Fluid constantly flows and has states. A day at the beach shows typical fluid dynamic issues. Beaches have erosion as waves come and go. Depending on the winds and how currents flow when standing in ocean water a person feels different patterns pounding on their body at different levels as water swirls around and past them. Make a change such as more wind or a motor boat come by and it all changes in an instant. A person like you can leave the water anytime but imagine a structure or ship that constantly has water rubbing it. Think about the conditions a typical storm may bring and one begins to realize that erosion on the beach happens to structures and ships. Finding ways to minimize the damage becomes a key element in hydrodynamic analysis.

Flexible Risers

Offshore oil production systems deal 24/7 with fluid dynamics of ocean water, but also the oil being pumped out of the seabed floor. Flexible risers serve as a key component of linking the platform and the well head of an offshore oil production system.  Vibration comes as a constant with all the movement of the fluid through a pipe under pressure. Keeping it all in balance to maintain maximum efficiency and productivity becomes the venue that analysis can help with. Knowing the way the process sequences will help show how to facilitate fluid movement in a way that keeps all flowing well makes the company and the bosses most happy.

Computer Models

Companies use software to input data from the client’s fluid dynamics. This allows a simulation of what occurs when water sweeps past solid material. It makes predictions of durability and erosion if the fluid dynamics continue at that level. A good analysis of the data will show ways to strengthen the material, how to make fluid flow faster or slower, and if a change in process or protocol would help move the product where it needs to go in a timely manner. It takes experts and companies with the right service to make it happen in such a complicated environment. Identify your issues today, and call a service in for your analysis. It puts more money in the pocket and increases safety.

Mooring Analysis: Critical for Selecting the Right Mooring

[Posted on March 12th 2014 by Bill Stewart]

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As any marine organization can tell you, installing mooring systems is more than anchoring a single CALM buoy or setting a fixed tower on the sea bed. It is critical to know how ships of different weights and sizes will react in the given location under different circumstances. Doing a mooring analysis is critical to determine the best mooring option and its placement.

Take tanker loading and offloading as an example. Takers are extremely sensitive to wave direction in an open water situation. In most cases, spread mooring would not work due to this movement. Tankers often use single point moorings that allow them to move around the single point based on the direction of the waves and movement of the water flow.

Determining what kind of single point mooring is appropriate to a specific application requires careful analysis. Here are a few mooring options:

  • Fixed towers with a slew ring work well in some single point applications. It works best in shallower areas where wave action is not heavy. At greater depths or in areas with heavy wave action, the tower can begin to bend. These towers are also susceptible to damage from even minor tanker bumping.
  • A catenary anchor leg mooring (CALM) are not as sensitive to water depth and wave action as a fixed tower mooring is. It is able to handle some bumping from tankers without sustaining extensive damage. Major tanker impacts though can cause damage that can put the CALM out of commission for a good length of time and cost a lot to fix. The mechanical components are also subject to extreme weather which requires ongoing, sometimes expensive, maintenance.
  • A SALM (single anchor leg mooring) solves the problem of expensive damage that CALMs can experience due to major tanker impact. They do this by placing the mechanical systems in an underwater arrangement at a depth below a ship’s keel. The simple surface buoy is easy to replace if its hit by a tanker. The biggest issue with the SALM is the maintenance difficulty and cost.
  • An Articulated Loading Column (ALC) is a mix of a fixed tower and a SALM. The tower holds the swivel and hoses above the likely point of impact with a ship. There is an articulated joint below water attached to a concrete base embedded in the bottom. This joint helps the mooring move in heavy wave action.

Determining which mooring application is right for a particular situation requires the ability to model the many factors that influence the ship and the mooring. A mooring analysis tool is essential in this process. It allows for quick and thorough modeling of a number of scenarios. Here at Stewart we use Orcaflex when we do a mooring analysis. This software package is the best marine engineering software package on the market today.

What to expect during a marine accident investigation

[Posted on March 5th, 2014 by Bill Stewart]

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Every year, the United States Coast Guard maintains records of various types of marine accidents, both commercial and recreational. Depending upon the severity of the accident, an investigation is requested. Our main goal while conducting a marine accident investigation is to prevent similar accidents from occurring in the future. Items we look at during an investigation include the loss of a ship, number of deaths, any serious injuries, any missing persons, material damage to ship and other ships, damage to area marine structures and the possibility of pollution.

After an accident has been reported, our inspectors head out to gather as much evidence as possible. We use this evidence to determine how to proceed with the marine accident investigation.  During the evidence collection process, our investigators will take photographs and video of the scene, vessels involved and any damaged equipment. In addition to photographing evidence, our investigators comb through logbooks, records and verify the qualifications and certificates of the crew.

In addition to evidence collected at the scene of the accident and from the vessels involved, we conduct interviews with witnesses and others directly involved in the incident. We may request to speak with crew, passengers, shore staff and other witnesses. During the interview process, we ask questions about the accident, as well as request any documentation the crew or witnesses may have, including photographs, sound recordings and video.

Our investigators will use the information collected to try and reconstruct the events leading up to the accident. It also helps investigators get an idea of what happened during and immediately after the accident occurred. This makes it possible to determine if the accident could have been prevented. Models, diagrams and landmark charts are used as visual aids in our reconstruction process. Computers and CADD programs help to digitally recreate the boats, structures and events leading up to the accident.

Other items we consideration during a marine accident investigation include looking into any recent safety recalls or reports of faulty equipment. We also check to see if the boat was secured to a dock prior to the accident. We will conduct a mooring analysis to ensure the vessel was tied up properly.

Documentation we use to assist with the investigation process include boat handling books, boat manufacturers owner’s manual, engine owner’s manual and various US Coast Guard instruction materials.

All information collected during the investigation will be used to determine the cause of the accident and who may be responsible. All discoveries will be listed in an investigation report that will be available to all parties involved with the accident, including stockholders and owners. In the final report, our investigators will give their recommendations for preventing similar accidents from occurring in the future.

The investigation is a long process and we make sure to cover everything from start to finish. We take pride in our investigation services, knowing we can help make a difference and hope to prevent similar accidents from happening again.

Flexible Risers for Business

[Posted on February 19th 2014 by Bill Stewart]

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When you’re starting an oil business or want to expand the offshore drilling plant you already have affordably, you may start looking into your options and discover various types of flexible risers at differing pricing levels. These risers are used in marine and offshore drilling, and they are one of the most affordable pieces of equipment that you can purchase for this type of work. These risers come in many shapes and forms, which is why most companies will buy them from a company specializing in custom risers and services for the industry. Stewart Technology Associates offers high-quality flexible risers, design, and analysis services to consumers, so you get what you need.

You expect to receive the best quality items for your oil rigs and offshore drilling requirements. Stewart Technology Associates offers specific tools that make sure you get the best, most cost-effective products. For example, Stewart Technology Associates can offer clients private riser design that will be made to suit any situation, analysis services to determine issues or benefits of different systems you’re considering, and uses OrcaFlex technology by Orcina, software used throughout the industry, to produce the best results.

The effects of cable dynamics are important, as they can impact the use of the equipment on your risers. In oil fields, mooring systems are sometimes used with flexible risers, and the cables and attachments must work correctly, or you could damage important hardware or pipelines. So, there are benefits in buying the right kinds of equipment. Steel catenaries, for example, are a type of riser that are flexible steel pipes. They run along the bottom of the ocean and are connected to floating platforms above them. These items can be used for deep-water drilling, and they can be hundreds of meters in length. Fortunately, because they are flexible risers, any changes in the flow of water, tides, or impacts can be handled well by the pipes, and the flexible design allows them to bend instead of breaking. These helpful risers will also transport potentially hazardous waste or materials through the ecosystem of the ocean, so knowing that they won’t break under minor bending pressure is vital.

Compared to other types of risers, these flexible forms are easier to manufacture and cost less overall. Even with the cost being lower, risers are one of the most affordable types. They are extremely reliable, too, and they can resist high temperatures, are flexible, and can withstand high pressure. They are often used in deep sea oil industries and in the gas industry because of their affordability and trustworthiness.

Stewart Technology Associates (USA): Experts in Cable Dynamics and Anchor Analysis

[Posted on February 12th, 2014 by Bill Stewart]

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Stewart Technology Associates (STA) is on the forefront in providing first class consultancy services in the field of offshore and marine technology. We are particularly experts in cable dynamics design and analysis.

Our clients find pleasure in working with us to access to ideal technology solutions in the related fields. We are always an edge over the others in seeing to it that the customers’ needs and interests are safeguarded. Not many can boast of accomplishments similar to what we have achieved to where we are. We are aware that consultancy is demanding, and requires total professionalism to give the best. That is one area that sets us apart from the crowd. We have reputable and highly qualified experts that know the ins and outs of their specialization. In addition, these experts have many years of experience to thank for the quality services they offer.

Trust us to help you with your cable dynamics design among other services. Our solutions are pocket-friendly and aimed at client satisfaction. They add value to the operation of the organizations that work with us helping them to reach and hit their set objectives. The long experience that we have in this field has been our stepping stone in scaling the great heights of success that is hearsay to other companies. We employ OrcaFlex, standardized software, in coming up with reliable, accurate, and easy to comprehend analysis. This software has been part of our greatest resources that has enabled us deliver according to our customers’ expectations. Our team continues to be part of success stories of many organizations in the field of marine and offshore technology.

OrcaFlex has made us move many heavy rocks and mountains. With over 50 years of superior service, there isn’t anything in marine and offshore technology that we cannot do. Among the industries that OrcaFlex has revolutionized include seismic research, defense, and oceanographic research. In defense, the submariners have identified this software program as the perfect tool for research and analysis of cable dynamics. We have also helped the separator sector, the processing technology industry, as well as the gas and oil industry to get the ideal software that is needed to make their operations swift.

We are also specialists in other services in marine and offshore technology. These are expert marine witness, CE marketing, risk assessment, design and analysis for jack up, anchor analysis, and financial assessment amongst other services. Both the public and private sectors come to Stewart Technology Associates for real and long-lasting consultancy services.

If you have a specific cable dynamics problem that you need solved, you have the experts at your service. The moment you check in with us, our team of experts will work with you for an ultimate solution to your problem. Check on us today to experience quality first hand.

Anchor Analysis for Offshore Drilling

Stewart Technology Associates has a history of excellence that makes us the perfect candidates for your anchor analysis needs. We use only the best software and hardware to provide you with estimates and calculations, you know exactly what you need to do on site. We also offer information on cable dynamics, so you know what tools and equipment are necessary and what you can do to improve your drilling system’s effectiveness.

At STA, we use OrcaFlex by Orcina to provide accurate information and anchor analysis. Since 1986, we have worked with drillers around the world, from government agencies to oil companies. We assist in gathering information, analyzing data, and making improvements that allow these structures to work to the best of their abilities. We also work with our clients to provide information on the best ways to improve the site for the safety of their employees; together, we can improve the site’s output while protecting the interest of those working on site.

Anchor analysis for offshore drilling is vital for a number of reasons. Drilling in new areas means you need to know the anchors you’re using and what they can handle, as well as the lay of the land under the ocean. With anchor analysis by Stewart Technology Associates (STA), you can rely on the information you receive. Anchor analysis will help you overcome any challenges you face in your drilling ventures, and STA can offer you solutions that will work when put into practice. Whether you’re lead to needing new flexible risers or want to explore new piping options, STA can help you get the right tools for the job.

We look at a client’s operation as a whole. When we receive the results of your analysis, we use this information to tell you how you can improve the safety of workers and heighten your site’s productivity. Together, we can develop solutions that will help provide you with higher output and value now and in the future. Not only can we provide you with the information you need to make improvements, but we can also help you implement those changes, allowing you to focus on the job at hand.

With the help of our services, you can prevent oil spills and leaks from harming your business. This will also minimize damage to the environment and your equipment. In the case that you are forced to deal with a spill, we also offer an analysis of the methods being used at the time of the spill and can help with containment and clean up.

Things To Consider When You Perform A Mooring Analysis

[Posted on January 29th, 2014 by Bill Stewart]

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Anytime a permanent structure is going to be built into the water, such as a pier, it’s important to conduct mooring analysis. This will help to determine the design of the structure as well as the materials to ensure that all has been taken into consideration. If analysis is not done, it can lead to problems down the road – including complete destruction of the mooring.

Many industries use mooring analysis, including offshore drilling. When an industry needs analysis conducted, it usually involves software where numbers can be added.

The software can generate a significant amount of data after some basic numbers are inputted. This includes looking at the depths of the water as well as such things as the type of water. Waves and tides can play an active role in the analysis as well because a structure needs to be high enough to compensate for such things.

There have been some instances when piers and bridges have been built without considering the highest wave. As a result, the entire structure was washed away when storm waves came crashing down. This left people to lose both time and money because of having to rebuild.

Industries do not have to take the time to learn through trial and error. There are plenty of ways to find out about the conditions of the water and worst case scenarios by conducting mooring analysis. When it comes to offshore projects, riser analysis can be important as well. Generally, anything that tells a person that they will be able to build because of having numbers in front of them to inform them it is okay is needed prior to going forward with a project.

Once a person is out on the water, they have to decide between buoy versus anchor. There are pros and cons to each. In some instances, the buoy can be more effective. It is a form of mooring that can be permanent. Boats can attach to it as opposed to dropping an anchor. This allows boats to stay stable and they don’t have to worry about an anchor dragging along the bottom of the ocean floor as the waves help to push them along.

In many instances, boats are not equipped with an anchor that is sufficient for the water depth and waves that they are in. As a result, they won’t drift as far as not having an anchor but they are still going to drift simply because they don’t have the right equipment. When it’s boating for fun, that’s fine. However, when it comes to offshore drilling and similar projects, drifting could be catastrophic.

Mooring analysis has to be done dilligently to ensure that all of the right equipment is aboard and that worst-case scenarios have been considered to avoid a loss of time, money, and destruction of property.

Why Riser Analysis Is Critical

[Posted on January 22nd, 2014 by Bill Stewart]

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When you are conducting any kind of offshore project, such as drilling, riser analysis is critical. You have to be sure you have the best designs possible, taking into consideration all environmental factors. If you do not have the best design, you may run into various problems out on the water. Accidents and incidents have occurred in the past and you can avoid many if you do the necessary advance planning.

You are always going to deal with waves in the ocean. Depending upon how extensive these waves are, they are going to affect your ability to float your entire operation.

The riser analysis is done to ensure your design has structural integrity. You may have a drilling vessel as well as a wellhead on the ocean floor. The waves in between will determine how much everything is rocking back and forth. You don’t want to run into situations where you don’t have a strong enough cable – or a long enough one.

The analysis will tell you what you need to know. You may need to obtain added equipment before leaving the shore to anticipate various problems. The rise analysis can be done on the computer, providing you with pages of data. From there, you can incorporate this data into other calculations and ensure your designs are sufficient based upon the information you are getting.

Just as you look at mooring analysis when it comes to docking stations, the same has to be done with the risers. Riser diameters and materials are going to play a role, as will the water depths. In many drilling projects, you may be dealing with depths of one thousand feet.

Many of the newer drilling operations are going into deeper waters. This means that designs you had when you were drilling into 500 feet of water are no longer valid. The riser analysis will ensure that you won’t have issues with the waves once you are out there. If you do not perform the necessary analysis, you may find that you are unable to drill effectively because of not making the necessary connections.

If you look at some catastrophic events that have taken place on oil rigs in the past, you can attribute many of them back to not having accurate numbers. Many drilling companies don’t take environmental factors into consideration at the level they need. You don’t want to make assumptions that the waves will only be a certain height or that the water depths will only be so deep.

You have to plan for the unexpected – and riser analysis is going to help. You may have begged, borrowed, and stole your way to obtain enough funds to drill. You will never get investors to give you money again if your project falls apart. A little analysis can go a long way to preventing accidents.

Stewart USA – Flexible Risers for Off-Shore Drilling

[Posted on January 8th, 2014 by Bill Stewart]

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The Off-shore oil and gas industry continues to need flexible risers to build  new structures.  The debates continue over off-shore drilling. No matter who makes the most valued point, the fact remains that it is a lucrative business with more lobbyists than gas stations, so will continue for a long while. Deep water deposits of  raw materials continue to  promise rewards, and the rising fuel cost puts pressure on all governments to go to more deep water to drill.  Oil and gas companies realize a very strong financial drive to pursue more and more off-shore oil rigs.

Risers are in Demand

Continued off shore rig development kept high demand for components that are used to build rigs high.  Among the most needed are flexible risers.  They connect platforms with oil and gas below the ocean, and then transport fuel to where it is packaged and transported. If we did not have risers, much of the oil and gas the world is mining would remain inaccessible.

 Steel Catenaries

The steel catenaries are risers that give benefits others simply do not. These risers are  steel pipes, flexible, and follow the ocean floor to the oil platform above.  They are meant for deep water drilling and often hundreds of meters long.  The first one built was by Shell twenty years ago.  It reached a depth of 872 meters.  These powerful risers operate at pressures between 2,000 and 5,000 psi. Not exactly like the pressure washer you use around your home! The flexible risers are less costly and really reliable, known for resistance to high temperatures, ability to take high pressures and flexible movement.

Technology and Development

Flexible risers s are primarily used in fragile marine settings and  transport hazardous materials through these ecosystems. Cable dynamics are used daily in the operations of oil rigs. Much of the research and development that has gone into flexible risers actually focused on safety and creating these to be as safe as possible. Fluid dynamics, mechanical technology professionals, soil mechanics technology professionals and many other professional personnel work to design the best flexible riser possible.


Flexible risers are not the only type of riser used when for off-shore oil and gas platforms. Another way which is better suited to some specific situations, is the bottom-weighted riser. This is technically not a flexible riser but has commonalities with them. Two distinctive characteristics  of the bottom-weighted riser are (1) its rigid elbow and(2) horizontal section made of titanium.

Flexible risers are usually the best solution but each platform needs a specialized evaluation.  They are each unique.

Stewart Technologies helps companies design platforms and determine which type of riser is best for each individual off shore  platform. STA continues to be the go-to authority for off-shore rigging and its production.


Trends and Uses for Cable Dynamics Today in Off Shore Industry

[Posted on January 7th, 2014 by Bill Stewart]

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Cable dynamics represent a vital part of all offshore technology projects, procedures and error solutions.  High quality technical reports are necessary, including diagrams which enable technical reports to be well understood by not only trained experts but by average lay persons or legal counsel.  Extensive use of computer software and state-of-the-art analytical simulation techniques are vital in today’s offshore industries and their management technology professionals.  A “notebook” computer and printer should accompany technology professionals when  performing their many important offshore duties or preparing  technical reports.   Millions of dollars have been awarded to clients of Stewart over the last fifteen years as a direct result of the expertise and reporting of the owner of Stewart Technology Associates,  W. P. Stewart, P.E.

Cable Dynamics Also Vital in Reenactments

Stewart Technology Associates maintains  databases of offshore and marine mishaps,  spills, and construction.  Other offshore costs factor into their technology projects, databases of construction and other offshore costs. These are most useful in maritime law.  All of the foregoing testifies directly to the expertise of STA company in offshore cable dynamics and other significant marine solutions.

An anchoring system for offshore is controlled by factors such as site environment, operational variables and the vessel  involved in the system.  Its adequacy and ability to stay on site must be checked by proper methods of analysis. The inclusion ofcable dynamics is an extremely important consideration in the analysis of a moored vessel, permitting anchor motion. Then numerically solved timehistories of cable displacements and cable tensions for cable figurations occurring under the Initial conditions are provided through mooring line static equations.  The equations of motion of the moored vessel subjected to an open ocean are then numerically solved, yielding time histories of vessel motions and cable tensions.

An example involving a moored production barge is examined and results compared with previous incidents.  In this way the cable dynamics are used in the proving labs or court of law as importantly as they are used in their offshore capacity.

Steel Risers

Flexible Risers had a set back in recent years but now they are in high demand. The riser components are used to build off-shore rigs very elevated are needed as much as ever. Risers are most definitely needed. These risers connect platforms with fuel deep below the ocean and carry fuel to areas for packaging and transport. Without risers, much of the world’s oil and gas would remain untouchable.

 Steel Catenaries

The steel catenary risers afford industry perks that others don’t. These are flexible steel traveling from the ocean’s floor to the drilling platform. Designed for deep-water drilling, they measure several hundred meters.

Stewart Technology Associates have played an integral part in the development of America’s oil industry, from working the offshore platforms to damages litigation.

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