Vintage Double Hose

I just finshed assembling my DA Aqua Master with one of Bryan's rebuild kit. Everything went well following advice I gain from reading the posts on this board. IP set to 110 on a 500 psi tank and stays there.

Now after I send my third one to Sir Chromealot for replating and a rebuild kit from Bryan I should be good to go for the summer.

Thank you again everyone,

Scubajim1

The 110 IP is that from the manual. It is conservative. Some of the otghers may be able to better advise you, I have mine set to 145 and it stays fine without leaking.

Any other more knowledgeable re-storers out there

Hi Treasureman,
I downloaded this from Vintage Scuba Supply Community Forum on page 20. The US Navy Diving Manual from the 1970s in a PDF format.

I think Bryan has it somewhere here also.

If others know or have different ip settings please inform me. I am a new guy here and I know when to shout up and listen.

Thanks,
Jim
Scubajim1

I think what John is trying to say is that many people experiment with various IP settings with different results.

The USD manual recommends 110 psi for the DA and 100 for the Royal.

Links to the information on the site

http://www.vintagedoublehose.com/downlo ... ualung.pdf

http://www.vintagedoublehose.com/downlo ... master.pdf

It is also a hot topic of discussion on the forum quite often.

Your results may vary....

That may be a little low for the DA but a good place to start. My limited experience tends to indicate the Royal responds better to boosted IP and more tolerent and has a wider sweet spot. I admit, I am not a super DA tuner, still learning. Mine is around 120 at 500 psi. My royals rtun from 150 down to 130 at the moment. I am deciding the 150 is OK with the Royal. Just expeimet--carefully. Nemrod

I moved this topic to this part of the forum as I know it will generate A LOT of discussion!!

One should take into account that the factory and Navy manuals 110 psi setting is with the regulator on a full tank between 2500 to 3000 psi. As the DA has an unbalanced 1st stage the IP will rise as the tank pressure decreases. Stating at an IP of 110 at 2500 psi the IP will increase about 20 to 25 psi at a tank pressure of 500 psi and would reach an IP of 130 to 135 at 500psi. I feel it is best to set the IP as high as possible without causing the 2nd stage to free flow with a tank pressure between 300 and 500 psi This will usually result in an IP between 110 and 115 at 2500 psi.
.

Bryan wrote:I moved this topic to this part of the forum as I know it will generate A LOT of discussion!!

Yea, this has been beat around quit a bit just like the issue of using a DA no a 3000psi tank.

The actual setting should be 115 psi (plus or minus 5 psi; I set at 120) with a tank pressure of 2500 psi for Royal Aquamaster. Also, after overhauling a reg you should leave it set up on the tank for an hour or so and there should be no drop in pressure from what you set it at. If you get a drop in pressure you should start checking for HP leaks.

Well, it's getting sort of late... (1:40 am) getting sleepy... here's an idea... if you really want to have fun... take the high pressure pin out of an aquamaster and give it to your best dive buddy to try out on their tank ... make sure it has one of the tire type knobs on it ... hehehe .... then tell them they broke your reg .... and laugh while they try taking it off the tank .... PLEASE don't do this !!! this is just a joke that was pulled on me before ...

Your statement is Not True.....USN manual page 563.....110 psi +/-- 5 psi.

Page 17 USD Aqua-Lung repair manual, Aqua-Master regulator No 1010-00 Step #8 Turn adjusting screw (29) slowly in a clockwise direction until the test gauge reads 110psi.

Page 24 USD Aqua-Lung repair manual, "Royal Aqua-Master" regulator No 1046-00 step #12 Adjust adjustment screw 28 until test gauge indicates approximately 100 psi.

Your results at 115-120-200-300 may work and may work better than is suggested by USD and the Navy but it should be stated as your opionon or result of your own testing not as a fact.

IMO setting a RAM at 115 is like leaving half the money on the table in a card game....but it is just my OPINION. not a fact as is stated by the manufacturer or testing by the USN

ok ... USD manual 1079-00 pg 1.47 ... I guess as time went on the seats, gaskets, and o-rings got better and pressures went up allittle bit... (had to look that one up). The one hour thing is just something I've always done. The manual says just to stick the whole thing in water and look for bubbles ...

forgive me ... that manual is for 3500 psi RAM ... Aquamaster DA is probably the lower intermediate pressure. I was wrong ... Bryans right ...

Bob, it’s not about being right or wrong so please don’t take it that way ! There are a lot of visitors to this site that are new to the world of diving, double hosers and especially R&R on their own equipment. My opinion is that they should be presented with the proven facts that the experts and manufacturers have established. That way they have proven and tried baselines for their regulators. After they reach a comfort level with the basics of servicing their regulators and get comfortable with their new skills and ability to dive with superior made equipment then the sky is the limit as far as experiments with IP’s, banjo fittings, nozzles, adaptors etc… Once again this is just my opinion…