[PSUBS-MAILIST] Fw: 12 Volt Reversing Continuous Duty Silver Contact Solenoid Relay for Winch Motor | eBay

Sun Aug 9 00:05:54 EDT 2015

Hugh,below is my question & answer in blue from G.L.. It is still a little ambiguous; it seems you need enough air to counter the negative buoyancy effectof one of your battery pods or largest other non pressure hull air spaces being breached at your maximum operating depth.I assume this volume is additional to the volume of air needed to blow your ballasts 4 x on the surface, as, if you were onyour 4th dive & a pod filled with water you would need to counter this negative buoyancy & blow your ballasts at the surface.Alan
In section 9, Piping Systems, Pumps & Compressors it states in 3.1 that there must be enough air to blow the diving tanks 4 x at the surface & 1.5 x at NDD. 
In my case, if my diving tanks were 500 liters in volume; this would mean I need roughly 2000 liters for surface requirements. 
Correct. Corresponds e.g. to 10l x 200bar. However for my NDD of 500 ft, to comply I will need to carry 10,000 liters. This seems ridiculous, as if I used a pump to empty my ballast tanks instead of compressed air, I would have no ability to put air in to my tanks at NDD. This rule also penalizes me if I want to build bigger ballast tanks. Is there an exception to this 1.5 x at NDD rule, or have I misunderstood it?
This Rule has its origin from submarines, which creates their own HP air reserves at the surface (naval submarines) and is not applicable for your submersible. 
Instead, the HP air reserves shall be sufficient to compensate any possible loss of buoyancy at NDD. Decisive is normally the largest pressure tight volume except of the human pressure hull, e.g. battery pot, junction box, external buoyancy tank, etc.. 

      From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Sunday, August 9, 2015 3:14 PM
 Subject: Re: [PSUBS-MAILIST] Fw: 12 Volt Reversing Continuous Duty Silver Contact Solenoid Relay for Winch Motor | eBay

#yiv0163723662 #yiv0163723662 -- _filtered #yiv0163723662 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv0163723662 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv0163723662 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv0163723662 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv0163723662 #yiv0163723662 p.yiv0163723662MsoNormal, #yiv0163723662 li.yiv0163723662MsoNormal, #yiv0163723662 div.yiv0163723662MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv0163723662 a:link, #yiv0163723662 span.yiv0163723662MsoHyperlink {color:blue;text-decoration:underline;}#yiv0163723662 a:visited, #yiv0163723662 span.yiv0163723662MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv0163723662 p.yiv0163723662MsoAcetate, #yiv0163723662 li.yiv0163723662MsoAcetate, #yiv0163723662 div.yiv0163723662MsoAcetate {margin:0cm;margin-bottom:.0001pt;font-size:8.0pt;}#yiv0163723662 span.yiv0163723662EmailStyle17 {color:#1F497D;}#yiv0163723662 span.yiv0163723662BalloonTextChar {}#yiv0163723662 .yiv0163723662MsoChpDefault {font-size:10.0pt;} _filtered #yiv0163723662 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv0163723662 div.yiv0163723662WordSection1 {}#yiv0163723662 Alan,Blowing of tanks. GL specs is that blowing at full depth or just in normal diving?Is it main ballast or just the VBT’sWhich section refers to this 4 x .Hugh  

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan James via Personal_Submersibles
Sent: Sunday, 9 August 2015 2:49 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Fw: 12 Volt Reversing Continuous Duty Silver Contact Solenoid Relay for Winch Motor | eBay  Rick,G.L. specifies that you should have enough air to blow your ballast tanks at least 4 X.So 12 x that Scott gets is good.Alan  From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Sunday, August 9, 2015 12:06 PM
Subject: Re: [PSUBS-MAILIST] Fw: 12 Volt Reversing Continuous Duty Silver Contact Solenoid Relay for Winch Motor | eBay  Thanks Scott, that helps quite a bit.  Rick  On Sat, Aug 8, 2015 at 12:15 PM, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

  Rick,There are tons of different sizes. I use Aluminum 80s for my sub.I also have Faber 95LP twin set for tec diving, and AL40 deco bottle. As well as several 80's. But 80's are common and cheap. I get about 6 dives per bottle on my sub, so with it's current configureation, can dive 12 times.Thanks,Scott Waters      Sent from my U.S. Cellular® Smartphone

-------- Original message --------
From: Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> 
Date: 08/08/2015 5:08 PM (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Fw: 12 Volt Reversing Continuous Duty Silver Contact Solenoid Relay for Winch Motor | eBay I am looking into purchasing two aluminum scuba tanks that will be used for the MBT's and wondered what size people use for the K-350? I am not sure what the combined volume is for them. I was planning on using 80's but a dive shop here has a used 100 cu ft which I didn't know they made. I would like to go large to increase my cycle times before having to change them. Any input appreciated.  Rick  On Tue, Jul 21, 2015 at 6:25 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:James, this is what I use with total success, you can get different amp ratings even up to 500a
Hank

--- On Tue, 7/21/15, hank pronk <hankpronk at live.ca> wrote:

> From: hank pronk <hankpronk at live.ca>
> Subject: 12 Volt Reversing Continuous Duty Silver Contact Solenoid Relay for Winch Motor | eBay
> To: "hanker_20032000 at yahoo.ca" <hanker_20032000 at yahoo.ca>
> Received: Tuesday, July 21, 2015, 11:23 AM
>
>
>
> http://www.ebay.com/itm/12-VOLT-REVERSING-CONTINUOUS-DUTY-SILVER-CONTACT-SOLENOID-RELAY-for-WINCH-MOTOR-/281165700963?pt=LH_DefaultDomain_0
>
>
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