Twinset Manifold Making Sound

[Derelict]

I am sure that if the shop missed something then the refill should be free.

Actually they did forget to stamp my tanks through some Friday madness in the shop trying to organise everybody's gear in time. I had to use up the air fill for them to stamp them, but the next fill was free. And actually, maybe that explains why something isn't right...

 

[WarrenZ]

Were the tanks assembled when they restamped the tanks? Could be the manifold was stressed during that impact.

 

[Derelict]

I had to leave my tanks there for a few days to get stamped so I'm guessing they would have disassembled them again. They're a good shop, as mentioned previously.

I don't know for sure though.

 

[halocline]

If they were mine I would take them back, tell the shop to drain them, and try again. It takes some patience to put together manifolds and bands. It's easy for the center section to bind as the bands are tightened. I would check for that. You should be able to loosen the locknuts on the center section and freely move it a least a 1/4 turn or so. When the shop inspected the manifold, that probably does not mean they disassembled the isolator valve, and that's the weak point in the whole isolator set up. Only one tank is sealed by a hard seat, usually it's the left one I believe. This means if the stem o-ring on the isolator fails, the right tank will empty even with the isolator closed.

To me this is a design flaw that manufacturers should look at. There should be a way to seal both tanks with hard seats at the isolator. The hard seats are MUCH more reliable, practically indestructible.

 

[Derelict]

So I've finally gotten around to taking these into my dive shop. So firstly the manifold is mis-matched to the valves. Not the end of the world though as they all fit correctly.

On the first report I was told that inside the manifold isolation valve, the o rings were full of flaky gunk, probably sea water leaking in, and the o ring was pretty dry. So they gave it all a clear out.

On the second report I received about an hour later, they discovered that there was a missing brass washer which had been mistakenly replaced with an o ring, and as a result was causing intermittent leaking.

So there's the issue. Must have still been holding firm enough to not rupture or leak, but not quite enough to allow some seepage.

So glad it's all resolved without too many complications (probably just a hit to my hip-pocket).