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Hi David
<div>Been following the thread and the first stage regulator will freeze up from the outside moisture. We use environmental kits on our first stages , the rubber boot/bladder, that are filled with vodka 😂. (Gray Goose). This keeps the external parts from
contact with water. The air I have here is very dry as I have special filters . Last test was -61F. </div>
<div>The first stage regs are not intended to have continuous hi rate flows because of the expansion cooling . <br>
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<div dir="ltr">Sent from my iPhone</div>
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<blockquote type="cite">On Aug 3, 2023, at 11:46 AM, Bernie Hellstrom via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br>
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<blockquote type="cite">On Aug 2, 2023, at 10:40 PM, Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br>
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<div dir="ltr" data-setdir="false">Best</div>
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<div>On Wednesday, August 2, 2023 at 09:24:18 PM CDT, David Colombo via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div>Cliff, something I experienced at Charlevoix, was the first stage regulator in the VAST was going into a freeze cycle when dumping air into the ballast tanks when we were getting the ballast corrected with multiple short dive attempts and then back to
the surface. It now has me wondering whether the air we got from Bernie moist, or the formation of ice crystals on the outside of the regulator was from the air coming from the hp vs lp port. I need to look at the regulator tonight to think this thru.</div>
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<div>Best Regards,<br clear="none">
David Colombo<br clear="none">
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804 College Ave<br clear="none">
Santa Rosa, CA. 95404<br clear="none">
(707) 536-1424<br clear="none">
<a shape="rect" href="http://www.SeaQuestor.com" target="_blank" rel="noreferrer noopener">www.SeaQuestor.com</a><br clear="none">
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<div dir="ltr" class="ydpce62179fyiv9387524574gmail_attr">On Wed, Aug 2, 2023 at 4:36 PM Cliff Redus via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer noopener">personal_submersibles@psubs.org</a>>
wrote:<br clear="none">
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<p>Alec, I setup a spreadsheet to analyze the following setup.</p>
<p> A scuba tank has a 1st stage regulator attached. A Tescom 44-4069 pressure reducing regulator with venting is attached and tubing is connected from the HP port to a set of Minn-Kota 101 motors. The question is can the small orifice in the HP port pass
sufficient air to handle the demand for air in thrusters to keep the pressure a fixed differential pressure above ambient water pressure.</p>
<p>The calculation indicates this arrangement will work. If anyone wants a copy of the spreadsheet, please email me your email address and I will send.</p>
<p>The calculation indicates the HP port could be used for this.<span> </span>Having said that, yes, this a simple clean setup but so is connecting to a spare LP port.<span>
</span>The advantage of the LP port is that pressure rating of the regulator body can be less so less 316 stainless and less cost.<span>
</span>Would be good to spec a regulator like the Tescom 44-4069 regulator with its venting capacity but for pressures one would expect from the LP port.</p>
<p>Cliff</p>
<p>PS: Hope you got your Land Rover back from the shop.</p>
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<div>On Tuesday, August 1, 2023 at 04:09:41 PM CDT, Alec Smyth via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer noopener">personal_submersibles@psubs.org</a>> wrote:
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<div dir="ltr"><font face="arial, sans-serif">Hi Cliff,</font>
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<div><font face="arial, sans-serif">"<span style="color:rgb(38,40,42);">The Tescom 44-4069 regulator would be a clean installation with just a single 1/4 SS tubing run from the HP port of the 1st stage regulator to the input port of Tescom 44-4069 regulator."</span></font>
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<div><font face="arial, sans-serif">There's a little problem with this plan, though easy to work around. <span style="color:rgb(38,40,42);">The HP ports on regulators have a tiny orifice, in order to prevent rapid loss of air if a hose or SPG fails. These ports
cannot provide the sort of flow you would want. </span></font>
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<div><span style="color:rgb(38,40,42);"><font style="background-color:inherit;" face="arial, sans-serif">Best,</font></span></div>
<div><span style="color:rgb(38,40,42);"><font style="background-color:inherit;" face="arial, sans-serif">Alec</font></span></div>
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<div dir="ltr">On Tue, Aug 1, 2023 at 12:17 PM Cliff Redus via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer noopener">personal_submersibles@psubs.org</a>> wrote:<br clear="none">
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<div dir="ltr">Sean, the specs do look good on this unit. To me the issue is going to be the cost. As background, the Parker regulator that Hugh, Alec and I have used for this application is the <span style="font-size:16px;font-family:new times, serif;"><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;">364-02BSS/M1
Parker Watts Pneumatic Regulator.</span></span>
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<div dir="ltr"><a shape="rect" href="https://store.livhaven.com/r364-02bss-m1-watts-fluidair-pneumatic-regulator" target="_blank" rel="noreferrer noopener">https://store.livhaven.com/r364-02bss-m1-watts-fluidair-pneumatic-regulator</a> at $217.51. I purchased
mine off ebay for a fraction of this.<br clear="none">
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<div dir="ltr">When I had the Parker <span style="font-size:16px;font-family:Helvetica, Arial, sans-serif;color:rgb(38,40,42);">364-02BSS/M1
</span>installed for pressure compensating for my four MK 101s, it was connected to the LP port from my AquaLung Titan balanced diaphragm first stage regulator. I had the <span><span style="color:rgb(0,0,0);font-family:new times, serif;font-size:16px;">Parker </span><font style="background-color:inherit;" face="Helvetica Neue, Helvetica, Arial, sans-serif" color="#26282a">364-02BSS/M1
adjusted to give about 2 psi over ambient.</font></span> I had the first stage set to 50 psi over ambient water pressure. I use this for BIBBS and blowing the MBTs. </div>
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<div dir="ltr">The <span><font style="background-color:inherit;" face="Helvetica Neue, Helvetica, Arial, sans-serif" color="#26282a">Tescom 44-4069 regulator would run directly off the HP air tank pressure then output go directly to thrusters. It would be
interesting to compare the Cv's for both regulators to get a feel on how much air flow rate they can provide to the thrusters descending and venting when ascending. </font></span></div>
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<div dir="ltr"><span><font style="background-color:inherit;" face="Helvetica Neue, Helvetica, Arial, sans-serif" color="#26282a">The Tescom 44-4069 regulator would be a clean installation with just a single 1/4 SS tubing run from the HP port of the 1st stage
regulator to the input port of Tescom 44-4069 regulator. From the output port of the Tescom 44-4069 a single 1/4 SS tubing to a Swagelok Tee that branched off to two more "T"s to give four 1/4 SS tubing runs to the thrusters.</font><br clear="none">
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<div dir="ltr"><span><font style="background-color:inherit;" face="Helvetica Neue, Helvetica, Arial, sans-serif" color="#26282a">We need to get a RFQ on one of these regulators. Do you have a preferred supplier?</font></span></div>
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<div dir="ltr"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;">Cliff</span></span></div>
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<div>On Monday, July 31, 2023 at 09:47:29 PM CDT, Sean T. Stevenson via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer noopener">personal_submersibles@psubs.org</a>> wrote:
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<div dir="ltr">I would be inclined to use a Tescom 44-4069 regulator for this purpose. Not sure what these sell for.<br clear="none">
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Sean</div>
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On Jul. 31, 2023, 20:37, Cliff Redus via Personal_Submersibles < <a shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer noopener">
personal_submersibles@psubs.org</a>> wrote:
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<div>My original air competition for the R300 used the regulator that Hugh Fulton has on QSub. These are pricey new but you can get them used on eBay. I was operating all four of my Minn kotas 101 off this single regulator. It was a special ss pressure reducing/pressure
releasing regulator. I had it installed on my last Florida dive which I went down about 100 ft . Unit worked fine. My first failure was on Flathead lake expedition in which one of my aft thrusters flooded. After that I switched to oil compensation. Alec
is using same regular on his articulated arm and not the thrusters. He felt issue with the regulator was that the port for releasing pressure on ascent was too small. I believe he has addressed this by adding a pressure release valve or OP valve. He can
elaborate more on his current strategy.
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<blockquote type="cite">On Jul 31, 2023, at 9:14 PM, Alan James via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer noopener">personal_submersibles@psubs.org</a>> wrote:<br clear="none">
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<div dir="ltr">John,
<div>I am happy with both air & oil. </div>
<div>Am intending to fill my thrusters with oil, but have the oil pressurized off my air comp system. This will reduce air use to just whats in the lines.</div>
<div>My electric manipulator will be air compensated off the same unit. Putting oil in it adds another layer of complexity.</div>
<div>I think I need to put out a long video once I've finished this</div>
<div>air compensator.</div>
<div>From what I am hearing from Cliff, he didn't get enough air delivery from the single regulator he was using. However I thought this was the same unit that Alec is using & was now happy with.</div>
<div>Alan</div>
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<div>On Tue, 1 Aug 2023 at 1:29 pm, Jon Wallace via Personal_Submersibles</div>
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