[PSUBS-MAILIST] Main Ballast Vent "T".

Thu Jul 30 18:38:48 EDT 2015

That is true. I have that problem. Honestly it isn't that big of a problem though. At the end of a dive I just blow in the valves and they work just fine. Thanks,Scott Waters

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-------- Original message --------
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org> 
Date: 07/30/2015  4:50 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Main Ballast Vent "T". 

Alec,there was the water lock problem that Scott (I think) had with the K350 design.When you dive, water enters the ballast air release line. Then you fill the ballast tankwith air to surface, & entrap the water in the line. Next dive, when you open the valve,no air comes out because the weight of the water in the line overcomes the force of the airtrying to leave the ballast tank. I think it was overcome by putting in larger tubing.That's how I remember the issue anyway.Cheers Alan
        From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, July 31, 2015 9:16 AM
 Subject: Re: [PSUBS-MAILIST] Main Ballast Vent "T".

This is interesting because the K350 and K250 have virtually the same design in this respect, but I can't induce this problem even on purpose. If I flood one tank 100% and only then start flooding the other, so that the boat feels like she's standing on her head, I still don't get a bubble block. Well... no complaints! But I'm looking at it carefully because I'm following the K design on the new boat as its worked well for me.
Best,

Alec  
On Thu, Jul 30, 2015 at 4:44 PM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hi James,I had a similar problem with the Comsub.  When it gets a bubble the vent is in the wrong place.  Centralised venting can create problems.  I am going localized pilot operated venting.Regards,  Hugh From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of James Frankland via Personal_Submersibles
Sent: Thursday, 30 July 2015 8:46 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Main Ballast Vent "T". Hi Hugh,  Drawing is not to scale or anything, it was just to give you an idea.  Anyway, its going in this weekend.  I know where the bubble is.  I think maybe my tanks are not as steep a profile as original Kittredge ones.  Maybe that's why I get the bubble.  Anyway, im pretty sure this will cure the issue. RegardsJames On 29 July 2015 at 21:58, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:Hi James.Turn your drawing at the angle you think you want, draw a line horizontal, then see if the outlet is above the bubble.Hugh.  From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of James Frankland via Personal_Submersibles
Sent: Thursday, 30 July 2015 1:11 a.m.
To: Personal Submersibles General Discussion
Subject: [PSUBS-MAILIST] Main Ballast Vent "T". Hi All, Im going to T in another vent pipe into my main ballast tank at the back.  Unless I submerge perfectly straight, I get a bubble stuck in either the front or rear tank.  If I T in this vent extension to the existing line, I can dive nose first and still get the bubble out.  I cant see anything wrong with this, but I though id ask in case anyone has any thoughts?  
ThanksJames 

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