Rigger73
First Officer
Flight distance : 378478 ft
United Kingdom
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AlexVideoShark Posted at 2018-1-21 14:26
honestly the underwater video and telemetry signal is already used ...
ROV needs a lot of power ... eletrically it moves very powerful engines/propellers ...
move heavy objects with hydraulic arms ... and more ...
I know what an ROV can and can't do - I've been working with them for over 10 years now. Eyeball and Workclass types, with plenty of flying time.
Your power-dolphin video is a surface unit only - so therefore it's telemetry can be transmitted via its back - into air - not water.
If you can show me where the tech is that can let you control an ROV at depth (up to 4000m these days) from the surface wirelessly - I'll take my hat to you. But we know of no ROV that is in service today with that capability, in our industry. There was a set up in Guam back in 2012, with acoustics and fibre optics - but its not really viable yet for oil and gas ROV systems yet.
For workclass ROV's you need roughly 3000 volts ac. The workclass I work with has 2850VAC for a 3 phase motor, that in turns runs hydraulic pump for the Sub-Atlantic 300 series thrusters, and then the tooling circuits - Schilling Titan 4 manipulator arm and Rig-master Arm. 2850VAC single phase is also sent down the main lift and soft tether via the TMS (tether management system), and then massively stepped down and rectified for powering the laser gyro, cameras, sonar, depth sensors, altitude sensors, MBES, Doppler etc - usually at 24VDC.
Oh - you also dont lift a ROV out of the water with the tether. The max load for our tether is 2ton. The mainlift can lift 20 tons though.
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