5 Things To Explore With Single Point Moorings

[Posted on March 23rd, 2015 by Bill Stewart]

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Single point moorings can be used as a station within the ocean for ships and oil rigs as a halfway point between where they need to be and land. It can help to save time and costs. The mooring is essentially a floating platform and when choosing to work with or build such a system, there are various things to explore.

The Materials

There are several aspects that go into single point moorings. This includes the anchor that is at the bottom of the ocean, the mooring line, and the connectors. The mooring line is ultimately what gets connected to the anchor and then goes up to the floating structure at the top of the water’s surface. The material of this line can vary from wire to chain to synthetic fiber rope. What is actually used will depend upon an array of environmental factors.

The right material needs to be used for the situation, otherwise it is possible for the line to break, causing the mooring to free float without being tethered down.

The Anchors

The entire system of a mooring relies on the strength of the anchor or anchors at the ocean floor. Analysis of soil composition needs to be made so the anchors are properly seated into the soil. There are such types of anchors as vertical load, suction, and drag embedment that can be used. If the wrong anchor is used, it can drag across the ocean floor, causing the mooring to sway and relocate.

The Actual System

There are several systems that can be used with a mooring. The ASCE will often speak about the different systems based upon the type of water that is being used. Single point moorings are ones that include a buoy, anchoring elements, mooring, and a product transfer system. These are most commonly used within the oil drilling industry, but it can be used for other industries as well. It’s important to understand that this is one of the many systems out there. Others include catenary, taut leg, dynamic positioning, and spread.

Positioning

Some consideration has to be made as to where the mooring will be positioned. It cannot be placed simply anywhere in the ocean. There needs to be a plan as to where it goes based upon where the work locations are and where the land is. Further analysis of the ocean floor conditions may also need to be made.

Environmental Factors

Understanding the environmental factors are ultimately the most critical part of looking at a mooring. Some of the various factors that need to be considered include ocean waves, currents, and wind.

Analysis has to include the various environmental conditions of a project to determine how the mooring should be built and using what materials. At Stewart Technology Associates, we offer various analytical reports that can be useful.

Get the Right Anchor Analysis for Your Job With Help from Stewart Engineering Associates

[Posted on March 15th, 2015 by Bill Stewart]

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Anchor analysis is vital as an offshore worker since it makes sure the platform stays safe. In a safe environment, you can do your job. As a subsea pipeline engineer, you work to develop, design, and test pipelines that will work effectively while bringing oil and gas from under the sea to the surface. Analyzing your pipes, anchoring, and other aspects of your equipment has to be a priority for your safety.

What is Subsea Pipeline Engineering?

A subsea pipeline is an offshore pipeline. It is laid below the ocean’s bed, which requires drilling, or it can be placed in a trench instead if one is available. You may find that the pipeline you need to create needs to be onshore most of the time but then must enter the seabed quickly.

When you need a pipeline engineered, you can consult with us at Stewart Technology Associates. Our software can help you determine if your equipment is up to the task of creating the line you need for gas or oil under the sea.

With us, you can have a new pipeline designed that stands up to the tasks you have in mind.

What Are Some Things to Consider About Pipeline Design?

When a pipeline needs to be tethered, you need to have an anchor analysis completed to make sure it can hold up to the power of the ocean, wind, and changing environment.

You’ll also want to consider how the pipeline could affect the offshore ecology. Do you need to tether or drill into a coral reef? Do you need to dig deep to find an anchor point that will be stable enough to hold? What do you do in the case that you’re close to shifting plates on the ocean floor? These are all questions you should have answered to make your operation run smoothly.

The tension of your anchor can be determined before you ever have to implement it thanks to anchor analysis and the application of math and science. Through the analysis software, you can see how the anchor needs to be placed to have the optimum amount of tension to hold your pipeline sturdy. The software can take into account geostructures that may influence the tension of your line as well.

Another thing to consider is geohazards. Things like earthquakes and slowly-shifting tectonic plates can cause landslides, shaking, overpressurized zones, and other problems. By considering these factors in your analysis, it’s easier to make sure your pipeline can stand up to these hazards instead of breaking or leaking, which would result in danger to the environment and a loss for your business.

Whether you’re new to drilling or need help with a particularly difficult scenario, we can assist you and make your job as easy as possible at Stewart Engineering Associates.

5 Types Of Analysis That Can Help The ASCE

[Posted on March 10th, 2015 by Bill Stewart]

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The ASCE is constantly working to help engineers and many engineers are part of the association. However, there is something to be said about the need for third party analysis. There are various forms of analysis that you can explore in order to give you more confidence with moving forward with a project and ensuring the right materials are selected.

Structural Design Analysis

Any new structures need to be analyzed from the very beginning. If the design has flaws, they need to be defined early on to avoid problems once weight is added and once the structure is put into use. Particularly within the gas and oil industry, rigs will need to go through this kind of analysis and engineers within the ASCE may need third party analysis, which is where Stewart Technology Associates comes in.

Hydrodynamic Analysis

Not everyone in the ASCE has taken a course on hydrodynamics and therefore it is important to obtain the needed information about how the behavior of water can affect engineering as a whole. This includes learning about energy, momentum, and drag forces to ensure that the correct materials are used and that the design is stable enough given the environment it will be exposed to.

Mooring Analysis

It’s imperative to understand the options available with moorings and buoys. Many companies will utilize single point moorings within the deeper waters, though there are other options to consider as well. Analysis of the overall situation will help a company to determine what is going to be best to provide stability. When a rig is planning on using a mooring as a half-way station for filling up fuel as well as dropping off barrels, the mooring needs to be stable enough to accommodate.

Anchor Analysis

Anchor analysis is a must when dealing with anything offshore. The waves, the weight of the anchor, and the stability of the soil are all considerations when looking at what kind of anchor to use. If the wrong anchor is used, it may not reach the bottom of the ocean floor. It could also drag along the bottom, causing a rig to drift as well as causing a lot of damage to the ocean floor. The analysis can be run through Orcaflex and provide you with the needed numbers to know what needs to be used.

Riser Analysis

The risers within an oil rig are an important part of the uptake system. If the risers are not made of the right material or structured in a necessary way, movement within the water can cause a disconnect and an oil spill. Many of the spills that have occurred over time are because of riser issues. The analysis can ensure this does not happen. Data can be crunched and worst case scenarios can be taken into account as well to avoid problems.

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