Extending Deepwater Technology to Seafloor Mining

Yu, Chenten; Espinasse, Philippe

doi:10.4043/otc-19912-ms

Cited by 2 publications

(3 citation statements)

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“…However, the required amount of power to lift the minerals in 2500m water depth (with the same production rate) is less than 6MW [13]. Therefore, it can be concluded that approximately 1MW (14%) will be lost in the system especially by mechanical friction in the hydraulic feeding tubes to SSLP.…”

Section: Subsea Power Demand Estimationmentioning

confidence: 99%

“…In addition to the ongoing research activities, a few companies have been working on this concept. Neptune Minerals is one of them that has designed a set of mining equipment including a grabber, an SMS crusher and a mining tool to extract the SMS minerals offshore New Zealand [13]. The airlift system is proposed by Neptune Minerals for vertical transportation [13].…”

Section: Deep-sea Mining Processmentioning

confidence: 99%

“…According to [13], there is a linear relationship between the riser pump required power and the water depth and this is the reason of having 8.4MW rated power for the power-fed pump motors in Table 2.…”

Section: Subsea Power Demand Estimationmentioning

confidence: 99%

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Investigation of AC and DC power distributions to seafloor mining equipment

Fard

Tedeschi

2017

OCEANS 2017 - Aberdeen

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The main goal of this paper is to study and compare different power distribution alternatives for subsea electrical components for deep-sea mining in the Norwegian Sea. Such application requires power delivery in the multi-MW range at water depth of more than 3000 m. Hence, AC (50Hz), DC, high frequency AC and low frequency AC can be possible options to transfer electrical power to the mining equipment. Comparing them at the preliminary stages of projects is beneficial in order to select the most suitable alternative. Minimizing voltage drop and distribution losses, in addition to reducing the number of components, their weight and cost are critical and often conflicting aspects, to design the electrical system appropriately. In this paper, the basic processes of deepsea mining (regarding Seafloor Massive Sulfides) will be described briefly. In addition, an estimation of the amount of required power to feed the subsea mining equipment for the Norwegian Sea case will be given and finally, different power distribution schemes will be analyzed and compared, using the PowerFactory/DIgSILENT software for simulations.

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Section: Subsea Power Demand Estimationmentioning

confidence: 99%

Section: Deep-sea Mining Processmentioning

confidence: 99%

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Investigation of AC and DC power distributions to seafloor mining equipment

Fard

Tedeschi

2017

OCEANS 2017 - Aberdeen

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Development of a Flexible Pipe for Deep Sea Mining

Rongau

Viale

2017

Day 2 Tue, May 02, 2017

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During subsea mining operations, minerals are extracted from the seabed, typically at about 2000m depth, and pumped with water through a riser pipe to a surface processing vessel. TechnipFMC, through its subsidiary Technip France, is the lead of a consortium comprising COMEX and DCNS which has been awarded a contract by BPIFrance to develop a pilot subsea mining system. The scope includes the development of a flexible riser. This flexible riser comprises an inner wear protection layer to resist the wear from the slurry, covered by a structure to withstand mechanical loads applied to the flexible during its lifetime. In order to select the most appropriate anti-abrasion material, a large scale bench test has been built to reproduce realistic flow in a piping system and compare wear on different materials; rubber, polyethylene and stainless steels. Complete analysis of the wear patterns has been conducted with the expertise of a laboratory. A statistical comparison between materials is presented. The response to wear, depending on material, geometry and position, is better known. One of the materials shows much better wear resistance than the others and is selected for further development. The next step is the development and qualification of the manufacturing process for the wear protection layer. This process has to be as much as possible compatible with current flexible pipe manufacturing plant. Parameters such as thickness, diameter or length of the layer should be adaptable according to needs. The compatibility with the pipe mechanical structure has to be tested as well. To meet these requirements, existing manufacturing processes are limited. At the time of writing this paper, different manufacturing methods to incorporate this wear protection layer within a continuous industrial flexible production are currently under investigation. Several prototypes will be realized for each manufacturing step. Prototyping is under test and will be presented in a forthcoming presentation.

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Extending Deepwater Technology to Seafloor Mining

Cited by 2 publications

References 0 publications

Investigation of AC and DC power distributions to seafloor mining equipment

Investigation of AC and DC power distributions to seafloor mining equipment

Development of a Flexible Pipe for Deep Sea Mining

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