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MxDiver
03-23-2009, 15:56
One of the manifolds for my ST72s is shot, I want to keep them as doubles. The tanks threads are 3/4, other than buying a vintage manifold are there other options? can a contemporary manifold be used?

UCFKnightDiver
03-23-2009, 16:05
will this work? http://www.leisurepro.com/Prod/OMSIM.html I think 3/4 in threads are standard now you sure your not talking about the 7/8 inch threads? I could be wrong here of course.

MxDiver
03-23-2009, 16:25
I measured the threads, they are roughly 1.03" in diameter and has 14 TPI

I think physically I can assemble the tanks. One of my concerns is the service pressure of the new manifolds 3500 psi, the tanks are rated at 2475 (with the +).

UCFKnightDiver
03-23-2009, 17:34
notthing that says you have to pump the tanks up that high. How old are your 72's? Also if it is a 3/4 in thread I would not necessarily recommend the oms manifold, also what is the 72's diameter, because that may determine what kind of manifold you need.

MxDiver
03-23-2009, 18:12
I do not intend to pump them that high, but having a manifold with those service pressures, my question was geared more towards the bursting disk as a safety feature, I assume with those higher presures the burst disk would be pretty much usesless on this application.
The diameter for the tanks is 6.8, the original manifold has a 8.125 center to center distance.
I believe the tanks are from 62, the markings read:
DOT-3AA2250
622372 PST
They had the hidro a couple months ago.

in_cavediver
03-23-2009, 18:48
First, 3/4 is a standard size so get a contempory manifold will work fine. As for fill pressure/burst discs - thats easy too. Simply change out the burst discs for the 2400+ rated tanks.

As for brands, I have 2 halcyons, 2 dive rites and 1 sea elite. I like the sea elite the best. (its identical to the halcyons but was 1/3rd the cost). I don't care for the hard plastic knobs on the dive rites. (one day, I'll swap them out)

UCFKnightDiver
03-23-2009, 19:11
the dive rite manifolds now have nice soft rubber knobs in contrast the oms knobs are hard

The Great Kazoo
03-23-2009, 20:16
My dive rites are soft smooth rubber.

MxDiver
03-24-2009, 10:30
Looking at the specifications for the new manifolds they all seem to have an 8 1/2" center to center distance. My tanks are set up at roughly 8", can any of the new manifolds be adjusted in, or would I have to get new bands in order to use them?

UCFKnightDiver
03-24-2009, 10:34
thats what I was wondering lol umm im not sure, if the diameter of your tanks is not standard then Im not sure if it would be easy to find a manifold or bands for that matter that work.

MxDiver
03-24-2009, 10:47
Yes, I can find bands for the tanks that will bring them out to 8.5". I donīt mind spending some extra $$ for the manifold, as it can be used on bigger thanks down the road, but if I have to buy new bands to fit it then Iīm better off just getting a used manifold for this set up.

Dark Wolf
03-24-2009, 12:20
I doubled up a set of 72's last year. I used a new Halcyon manifold. No problems setting them up, and no problems using them. I just recently took the manifold off to use on my new steel MP 120's.

DW

MxDiver
03-24-2009, 12:36
Do you know what the center to center distance was on your 72s?

Dark Wolf
03-24-2009, 13:19
I will look, they are currently banded as indy twins for a friend of mine. They are 6.9" tanks.

Ok, looks like center to center with the tanks banded is 8.5". Do your bands keep the tanks closer together?

DW

MxDiver
03-24-2009, 17:10
Yes, my bands where made for the original manifol and keep the tanks at roughly 8 1/8" apart.

Dark Wolf
03-24-2009, 17:32
A new manifold will work, since you will have enough adjustment space to get everything set up.

DW

in_cavediver
03-24-2009, 18:19
the dive rite manifolds now have nice soft rubber knobs in contrast the oms knobs are hard

Good improvement. Both of mine are the older hard plastic.

As for sizing, I have a 'standard' isolator and a 'shorty' isolator. The shorty came with a set of steel 45's which has a much tighter spacing. I would call either ST, Dive Rite Express or Cave Excursions to see what the spacing on their manifolds are. There is something out there that will work and I know at least two of the three above stock dive rite manifolds so they could simply pull one out and check the center/center distance for you.

MxDiver
03-24-2009, 20:07
I will give ST a call, and probably post a thread on the WTB just to keep my options opens just in case.
Thanks.

WD8CDH
03-25-2009, 09:31
The Dive Rite manifold for 5.5" tanks is 7.75" center to center spacing and can be adjusted by at least .25" either way and can probably go out to 8 1/8". I have used one of these manifolds with vintage bands and steel 72s.

SCUBA Diving Equipment for Technical, Wreck and Cave Diving: Dive Rite, Inc - Product Catalog - 200 Bar 5.5" Tank Manifold (http://www.diverite.com/products/catalog/valves/va3003-200)

Personally, I like to keep my tanks spaced as close as possable and use bands that allow closer spacing.

MxDiver
03-25-2009, 20:25
I had sometime on my hands today so I decided to make new bands, I didnt quite got the 8.5" spread, it came out to 8.4" The OMS V-200RC has some adjustability to it, the XS scuba which ST sells seems to be a rotating cross as well so it may work.