[PSUBS-MAILIST] Scuba Tank Purchase Questions

Thu Feb 20 15:44:14 EST 2020

Hi Steve,

I concur with everyone else regarding DIN. But one thing to point out is
that modern DIN fittings come with a little screw-in adapter that turns
them into yoke fittings. So in the event you needed to grab a tank and put
an old regulator on it, you can still do so.

Best,
Alec

On Thu, Feb 20, 2020 at 3:16 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hank,
> Just wondering, with those O-ring failures mentioned, were you travelling
> with the tanks fitted on your sub & yokes on?
> If so there might have been a lot of rotary movement on the dry O-rings
> while
> bumping around on a long trip.
> Alan
>
>
> On 21/02/2020, at 9:08 AM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Steve,
> most o-ring failures are on the surface, & you will hear a leak straight
> away.
> When they leak under water it is normally a slow leak.
> It's recommended that you look at your O-ring as part of a pre dive check.
> Some divers spit on them prior to assembly to grease them up a bit.
> The O-rings are normally replaced in an annual visual inspection.
> Maybe just make sure you have new O-rings & carry spares.
> 10s of thousands of divers are using them & they are a lot more vulnerable
> than you who will be using them for blowing ballast.
> Great Escape was a great movie. You could have named it "The Blob"
> Alan
>
>
>
> On 21/02/2020, at 8:30 AM, Steve McQueen via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Thanks. Didn't realize yoke O-rings were such an issue. This changes my
> mind on my valve choice.
> Appreciate reviewing this topic.
>
> Steve
>
> On Thu, Feb 20, 2020 at 2:23 PM T Novak via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Just a case in point about DIN versus yoke, during the Flathead Lake
>> expedition we blew two yoke O-rings on the Gama scuba tanks. It goes
>> without saying that spare O-rings are a necessary inventory item to have on
>> hand during sub ops.
>>
>> Tim
>>
>>
>>
>> *From:* Personal_Submersibles [mailto:
>> personal_submersibles-bounces at psubs.org] *On Behalf Of *Cliff Redus via
>> Personal_Submersibles
>> *Sent:* Thursday, February 20, 2020 10:25 AM
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Subject:* Re: [PSUBS-MAILIST] Scuba Tank Purchase Questions
>>
>>
>>
>> Mine are aluminum for primary and I have a composite tank internal as a
>> backup HP source.
>>
>>
>>
>> With a name like yours, you could not find a better boat name.
>>
>>
>>
>> Cliff
>>
>> Sent from my iPhone
>>
>>
>>
>> On Feb 20, 2020, at 10:57 AM, Steve McQueen via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> 
>>
>> Cliff, thanks. Good to hear about actual field issues. I will reconsider
>> my thoughts a.ccordingly.  I have completed my contribution for Pisces VI
>> and have refocused on finishing my project. Having your own compressor is a
>> nice advantage. Are your MBT HP tanks aluminum or steel?
>>
>>
>>
>>  My K-250 is named "The Great Escape" (get it?).
>>
>>
>>
>> Steve
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Thu, Feb 20, 2020 at 11:36 AM Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Steve, if it were me, I would go with DIN fitting on scuba tanks.  About
>> 2 years after I built my boat I had an O-ring blow while I was on the boat
>> ramp ready to launch. If this would have happened during a dive, I would
>> not have been unable to blow my MBTs by myself.  I would have had to have
>> divers to manually inflate my MBT with open vent ports.  My experience is
>> that most scuba shops can fill scuba tanks with DIN connections.  After the
>> incident, I switched my MBT HP air supply to DIN values and have never had
>> any trouble since then.  Also, last year I purchased a portable scuba
>> compressor that came with an adapter to let you fill Yoke or DIN valves.
>> Also this compressor is capable of filling a steel HP tank if I want to.
>> To me, the real benefit of steel tanks with DIN connections is the ability
>> to fill to a higher pressure.  If you don't need the higher pressure, then
>> aluminum are lower cost.
>>
>>
>>
>> We are all looking forward to your sea trials for your lime green K250.
>> I love the paint job on your boat.  Has she got a name yet?  I am surprised
>> you have had any time to work on your boat with the PLC work you been doing
>> for Scott on his Pieces 6.
>>
>>
>>
>> Looking forward to catching up with you this year at one of the psub
>> events.
>>
>>
>>
>> Best
>>
>>
>>
>>
>>
>>
>>
>> On Thursday, February 20, 2020, 09:54:59 AM CST, Steve McQueen via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>>
>>
>>
>> All, getting ready to buy 2 scuba tanks for my K250. Just wanted to see
>> if anyone had an opinion of my thoughts?
>>
>>
>>
>> 1) Choosing steel vs. aluminum (prefer its weight/buoyancy
>> characteristics)
>>
>> 2) While I was wanting as much air volume as possible I decided against a
>> HP version as I have heard most places won't (can't?) fill to that capacity
>> anyway
>>
>> 3) Deciding on standard pressure steel 80s with K-valve (yoke fitting)
>>
>>
>>
>> I've been watching for a while (including Black Friday) but it seems
>> there isn't much mark up and these tanks don't appear to go on sale.
>>
>>
>>
>> Thanks,
>>
>> Steve
>>
>>
>>
>>
>>
>>
>>
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