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Tether leakage test


#1

Many cables have protection against leakage, but how good is this protection, what depth does it work and which piece of cable will be damaged after water hit?
We made a test at 6 bar and got leakage in case of 5 cm of tether only!

Where wasn’t leakage at all even at 10 bar with a piece of 50 cm long.


(undersearobotics.com) #2

I think your test might be more realistic if you ran it for an hour or longer. Keep in mind, if it can leak through even 1 cm of tether, eventually it will reach even 100+ meters if you leave it in water and at pressure long enough.


#3

We made it this way just to show you. In our tests we left it in hyperbaric chamber for 12 hours.


(Harold Scadden) #4

You can have the cable jacket breeched and still have a functional cable as long as your insulation on the conductors is still doing its job. PASS/FAIL really depends on what you set for that situation.

Now with a jacket breech, you are going to have water movement within the cable. For anyone using SAP as a waterblock … good luck in saltwater … it might as well not exist. If you have traditional rubberized waterblock you can get more mileage. The one thing that will kill you in the end run is water getting to your connections at the end of the run. That is when the sparky fun starts.

Been building testing cables for almost 25 years at pressure … we go up to 138 Bar on a regular basis and it is only many flavors. Copper, fiber optic, RF and any combo of all three so I have pretty much seen the gambit of the Good, Bad and the Ugly.


(Magnus) #5

This test is conservative, as the cable in real life would have equal pressure at both sides of the jacket. This test would subject the bonding for more peeling stress than it would experience in real life. Good job, though!