September 14, 2015

Published by Stewart Technology Associates

Safety issues and environmental impact head the list of concerns regarding moored vessels. Proper analysis can help an oil company avoid a host of problems as well as suggest the best ways to improve safety and function of anchor technology. Oil spills, property damage, capsizing, and loss of life can be prevented with an accurate study and the right recommendations. Mooring age, vessel size, weather, and sea conditions all have an impact on mooring stability. A company may need to modify existing mooring structures, or at the very least have contingency plans in place in the event a mishap occurs.

Experience and current technology is needed to address these issues before they become problematic. Prevention is and will always be the best way to deal with potential problems. Stewart Technology Associates has the know-how to find out what those problems are and help a company implement the necessary fix.

A good series of anchors is as integral to a ship as its engine. Your collection should include stockless, kedge, and BBI-Delta type anchors. In addition, you should have hundreds of feet of all-chain rode ready to be deployed with your anchors of choice. But how do you choose which anchor and what length of rode when the time comes to anchoring?

While some sailors are adept at selecting the right ground tackle according to the necessary and complex calculations that combine seabed type, ship length, weather outlook, etc.; using a proper anchor analysis is the only way to ensure your ship is anchored safely. The following are two of the most common (and most hazardous) problems that can be avoided with a proper anchor analysis:

  • Dragging.  Deploying too light or the wrong type of an anchor for the seabed soil conditions, weather, and current (or failing to put out enough rode) can and often will cause your ship to drag. As any captain knows, dragging is a dangerous event that can cause your ship to collide with other boats, reefs, and other marine and land hazards.
  • Fouled anchor.  Deploying too heavy an anchor with too much rode in certain seabed soil conditions can cause your anchor to be burdensome, and in the rare instance impossible, to recover. A fouled anchor can also occur if you opt for a two-anchor hold but fail to take into account frequent wind and current changes in a given anchorage. 

February 6,2016

What type of problems can be avoided with a proper anchor analysis?

Published by

Stewart Technology Associates

Two of the biggest concerns for every offshore oil company are ensuring safe operation and low environmental impact. Both of these concerns become especially heightened with moored vessels that, when not properly anchored or otherwise tethered can lead to huge problems like oil spills, capsizing, property damage, and seafloor damage. In extreme weather and unsafe operating conditions, poorly moored vessels may even lead to unacceptable loss of life. 

A proper anchor analysis is simply one of the best ways to avoid such catastrophes. Such an analysis will account for a vessel's size, the weather conditions, sea conditions, and age of mooring or ground tackle to assess a mooring's stability. Technology created by Steward Technology Associates inputs such information and runs scenarios determining the best estimated amount of stress that the anchors will be subject to due to the current waves, tidal currents, seabed soil conditions, winds, and tonnage. The anchor analysis will then determine the most ideal anchoring system for the present time, whether it's a single anchor leg mooring, catenary anchor leg mooring, or something else entirely. 

Only once the ideal anchoring conditions and equipment have been selected, can an oil tanker safely and securely deploy their anchor and begin the loading and offloading of equipment and oil with confidence. Such proper mooring ensures that even in turbulent waters and intense winds, anchors will hold.

October 6th, 2015

What are the benefits of professional anchor analysis?

Published by Stewart Technology Associates

Anchors are a critical component for any marine vessel, including oil rigs, tankers, fishing vessels, container ships and military vessels, and every ship has different characteristics that must be considered for a safe and effective anchor to designed and deployed properly. There are multiple forces acting on a ship’s anchor at any given time, including the weight of the vessel, the weight of the cargo, the action of the waves, tidal forces, winds and inclement weather. A professional anchor analysis can be used to model these force on a given anchor design in real-world conditions, allowing you to identify weak points in the design and improve it to reduce structural failures. Here are a few of the tangible benefits of having a professional anchor analysis performed on your design:

  • Improved design with minimal prototyping, testing and development costs
  • Safer anchor design that reduces accidents, injuries and property damage
  • Anchor analysis performed by a professional with extensive marine engineering experience
  • Sound advice about design deficiencies and how they can be eliminated
  • No need to invest in expensive software, equipment and personnel to perform the analysis yourself

In many cases, a professional anchor analysis will be the most cost-effective and reliable option.

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