Manifold Question OMS

[LavaSurfer]

I have an OMS Manifold on a dual 130 HP setup
My tanks are in getting hydro'd and I need o-rings for the manifold.

After looking at their site I found this
200 & 300 bar Rotating Cross Bar Manifold

Below is the isolation valve assembly and it shows three 0-rings.

My assembly has only two o-rings. (No Picture)

Can anyone enlighten me?
No I have not called OMS yet.

 

[Jimmer]

You likely just have an older manifold. OMS in their infinite wisdom suddenly decided that 3 was better than 2, despite the fact that everyone else does 2, and I have never heard of both O-rings failing simultaneously, to the point that a 3rd would make a difference.

 

[oxyhacker]

Most of them I can recall seeing have two, as does the one in the "new" schematic at the NESS website.
http://northeastscubasupply.com/tanks/omsrebuild.html
so using 3 must be a fair recent change.

What's the problem, anyhow? If yours only has 2 O-rings, isn't the logical thing to do to replace just the two?

I assume you are aware of the OMS recall on these manifolds.

My assembly has only two o-rings. (No Picture)

 

[LavaSurfer]

What's the problem, anyhow? If yours only has 2 O-rings, isn't the logical thing to do to replace just the two?

There really wasn't a problem I was curious as why there were two.
This is a set of doubles and manifold I was given. I am just trying to figure out what I have and get them usable. Hydro, Vip and rebuild the Manifold.

I assume you are aware of the OMS recall on these manifolds.

Nope, thanks, I will call them
Sounds like one more step over the above.

Come to think of it, I am assuming the Manifold is OMS
Here is a picture of the tanks with Manifold

 

[LavaSurfer]

I was wrong - Doh!
Like I said, I was given them and assumed what I was told was true

The manifold is a halcyon

No clue on the tank Manufacturers.
I believe they are OMS

 

[oxyhacker]

Well., only two, the Big P small st Pressed Steel symbol, and the E9791 exemption, which is Pressed Steel's.

Oh, if they are being hydroed make sure the hydro shop knows about the Pressed Steel "rounding out" d-101-E service bulletin, and that the tank is only tested to 3/2s not 5/3rds.

No clue on the tank Manufacturers.
I believe they are OMS

 

[Captain12Pk]

Maybe I'm wrong, but those don't look like OMS valves to me. The shape and the big Halcyon stamp make me think they may be Halcyon valves.

 

[SteveAD]

tanks are PST

 

[LavaSurfer]

Maybe I'm wrong, but those don't look like OMS valves to me. The shape and the big Halcyon stamp make me think they may be Halcyon valves.

LOL
Ya Think

Got it all figured Out.
Spoke with Halcyon
Need Size 012 o-rings.

Just Vip'd the tanks, they look good.
Taking them in for Hydro

Splain to me the deal on the

Pressed Steel "rounding out" d-101-E service bulletin, and that the tank is only tested to 3/2s not 5/3rds.

5/3 = 5736 psi
3/2 = 5163 psi
Seems rather dramatic of a difference.

 

[oxyhacker]

Actually, the TP is 5250 because that's what's stamped on the tank, a reminder that the 3442 PSTs are really 3500 tanks stamped for a lower pressure, so they could use the combo valves. But you can't assume the hydro shop will know why that funny number is stamped there or what TP means.

5/3 = 5736 psi
3/2 = 5163 psi