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Originally Posted by Dr.Sid
Interesting ! I read microbubbles can live quite long and quite deep with rough sea or in the ship wakes. Can that be trouble ? Like microbubbles getting into the tanks (through lower openings) from outside ?
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Your biggest concerns are the bubbles in the ballast tanks after the ship submerges. I don’t know anything about micro bubbles in the wake (cavitation maybe?) or seeping in from the outside (seems a bit farfetched to me.) But the idea was that even if we cycled vents at 150’ there was always an additional concern that some air may return upon returning to shallow depth after operating deep for a period of time. Basically those microbubbles trapped in the ballast tanks are a non-issue until they become bigger bubbles as the ship changes depth from deep to shallow; don’t forget that water pressure at deeper depths keeps the bubbles small while the change in water pressure causes the bubbles to expand, making noise, on the way up.