As field season is starting for myself and my crew, we plan on getting our Blue ROV2 out in the water doing dives. In prep for this season we have begun bringing out our ROV. Over the past two weeks, we have had significant issues passing and performing a vacuum pressure test. Around two months ago a pressure test was performed just because the ROV had been sitting in storage all winter and it passed.
Since then we have not been able to achieve a good test. Every time my crew has gone to test the main watertight enclosure our pump cannot get past the zero section on the hand pump, and cannot retain any pressure at all.
When using the pump on the battery enclosure it can build up a little pressure but it will all be released in less than a minute.
We have tried replacing the pump, and we have thoroughly looked and checked at all screws, seals, o rings, and possible places for a leak to be. We are truly stumped as to what the issue could be. (we have also done tests and the pump seems to hold pressure fine with just a cap on the end).
This leads us to believe this issue isn’t a leak but a faulty pump or entry point.
A thought we had is that possibly there’s an issue keeping a seal between the pump’s entry point and the enclosure, but there seem to be no visual issues there.
We are wondering if anyone has any possible answers or solutions to this persistent issue… Hoping to get our ROV in the water as soon as possible but this pressure issue is keeping us from doing a test dive. We aren’t sure how to rule out if it is a leak or not and do not want to risk getting water inside the chamber. Are there any other ways to test for air leaks?