We are planning some research into the effects of ROV water-jet cleaning of subsea structures and are struggling to find typical conditions that might be employed.
‘Cleaning’ in our terms would be removal of algae, seaweed, etc.
Ideally we’re looking for help on pressures, fan-shape and size and stand-off distances that might be typical.
Maybe this should be moved over the to technical section it is not really a rookie type question, seems to be more of a company on a fact finding mission.
Maybe this should be moved over the to technical section it is not really a rookie type question, seems to be more of a company on a fact finding mission.
Many years ago I was involved in Cleaning of platforms in the North Sea, We had a 30 K PSI jetting skid fitted to the ROV, with a rotating head.
The task was to clean the welds of the platform to a standard of 2.5 SA.
The speed was appalling, maybe up to 500 mm per hour if that.
We preserved for a season with this.
However we found using brushes was much more efficient so the second season we used these.
Speed up to 4 to 5 metres per hour.
Then for season 3 we used grit entrainment (Water / grit mixture) to do the same.
Speed 20 metres plus per hour.
Our company also had a job in Australia where they used a tool called the scimitar this was a massive brush that was deployed on the horizontal members on a platform for the purpose of remove excessive amounts of marine growth. See links below.
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