Visability and seabed trenching

[DANFROV]

In using dredging equipment etc. in the past there has always been an issue of Visibility.

Have any of you guys any good Ideas to maintain at least navigational / where is the manip nozzle visibility.

At Sonsub we once used a small high volume pump to blow past Camera / ROV frontend to keep area reasonably clean. Any other Ideas.

Dan

dan@workocean.com

[Savante]

sensor loadout – put linear and rotary sensing on the "snout/sword" so that you can see where it is with respect to the vehicle. You’d be relying on the sword not flexing. would take little effort to put a good gui together, but it’s not a big challenge. Could do a video overlay.

Take me a couple o’days to prog. Is this for technip? What water depth are you intending? <300m?

$$$$ ?

[James McLauchlan]

On the Nav/Vis front…..
The client often wants to see something visual, even if it is a view of where the sub is heading to or about to move over.

The point is often missed by many operators, but trenching into the current will at least allow the front cameras to give you some kind of vis. It will also allow you to see if any forward progress is being made, at a finite level, rather than waiting for nav to update, which can sometimes be spurious with all that muck around the vehicle.

Ensure that the client is aware that you may need to shift up and down the line depending on current/vis

[Rons_ROV_Links]

What water depth are you intending? <300m?

Appr. 3000m, see the topic about dredging.

We don’t have any vis during rockdumping (our cameras are look straight down to the seabed). We’re using profilers (3xSeabat 8125 and 1xMesotech) to maintain our visibility. I am for sure when using a sonar you will see the nozzle as long as it is in profiler-mode instead of imaging-mode.

[Author]

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