Difference between revisions of "Anchoring"
(New page: Anchoring is one way to maintain position. We should distinguish two different types of systems: permanent anchoring and retractable anchoring. Ships come equipped with a retractable anch...) |
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Anchoring is one way to maintain position. | Anchoring is one way to maintain position. | ||
| − | We should distinguish two different types of systems: permanent | + | We should distinguish two different types of systems: permanent [[Mooring]] and retractable anchoring. Ships come equipped with a retractable anchoring system, but the accuracy of such a system is limited, as an anchor may drag across the ocean floor. |
| − | Permanent anchors/mooring systems are used for offshore platforms. They provide greater reliability than a typical | + | Permanent anchors/mooring systems are used for offshore platforms. They provide greater reliability than a typical retractable system. One means of setting a permanent anchor is by means of suction anchors. |
| − | The cost of anchoring is a function of depth, as the cables represent a significant part of the cost. And of course, the cost is a function of maximum force, which strongly correlates with total displacement. | + | The cost of anchoring is a function of depth, as the cables (see: [[Catenary]] represent a significant part of the cost. And of course, the cost is a function of maximum force, which strongly correlates with total displacement. |
Some data is available in [[http://www.marineitech.com/downloads/2004-jsc-186.pdf here]], p3. | Some data is available in [[http://www.marineitech.com/downloads/2004-jsc-186.pdf here]], p3. | ||
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1M$ for a 1600st structure, and 4M$ for a 5500st structure. | 1M$ for a 1600st structure, and 4M$ for a 5500st structure. | ||
| − | These are material costs; installation costs are unclear, as they are lumped into another category. | + | These are material costs; installation costs are unclear, as they are lumped into another category. Including worst-case installation estimates, mooring costs are about 1/3 of total costs. |
| + | Assuming 50 people on a 5500st structure, the cost merely of getting a fixed location is large compared to what you would pay for land prices. | ||
| − | + | See a video on anchoring: [https://www.youtube.com/watch?v=62O7KYfb4GA How To Anchor a Mega-Ship - Anchoring & Equipment Explained! - Life at Sea JeffHK on Youtube] | |
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Latest revision as of 16:23, 23 August 2017
Anchoring is one way to maintain position.
We should distinguish two different types of systems: permanent Mooring and retractable anchoring. Ships come equipped with a retractable anchoring system, but the accuracy of such a system is limited, as an anchor may drag across the ocean floor.
Permanent anchors/mooring systems are used for offshore platforms. They provide greater reliability than a typical retractable system. One means of setting a permanent anchor is by means of suction anchors.
The cost of anchoring is a function of depth, as the cables (see: Catenary represent a significant part of the cost. And of course, the cost is a function of maximum force, which strongly correlates with total displacement.
Some data is available in [here], p3.
The setting is 6000ft water depth in the mexican gulf; the anchors are capable of withstanding hurricane force.
1M$ for a 1600st structure, and 4M$ for a 5500st structure.
These are material costs; installation costs are unclear, as they are lumped into another category. Including worst-case installation estimates, mooring costs are about 1/3 of total costs.
Assuming 50 people on a 5500st structure, the cost merely of getting a fixed location is large compared to what you would pay for land prices.
See a video on anchoring: How To Anchor a Mega-Ship - Anchoring & Equipment Explained! - Life at Sea JeffHK on Youtube
