[PSUBS-MAILIST] p trap

[hank pronk via Personal_Submersibles]

Alec,
Your plan is good also because the oil can expand from hot weather with the bellows.  I hope to be back in the water in a week or so.  Life and work is holding me up.  
I have my new trailer ready, I built a hydraulic actuated idler wheel.  The system raises the trailer off the ball as well as allows the trailer to roll into the water.  I use a tow strap rather than an extendable bar because the ramps here are long and steep enough.  

Hank
--------------------------------------------
On Sun, 6/14/15, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] p trap
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Sunday, June 14, 2015, 5:52 PM
 
 Thanks
 Hank. Looking forward to hearing how it goes. For my part I
 have trouble with the oil trap method because of the fact
 the thrusters rotate. But I'm going to try the
 following. The old method is a hose wound around the cans
 between an elbow at the top and one at the bottom. To fill,
 I disconnect the tube from the top elbow and add oil through
 the tube until it flows out the top. The problem is a little
 of the elbow protrudes inside the can, even though I trimmed
 it, so its hard to get every last bubble out. The plan is to
 replace the tube with a plastic bellows bottle attached to
 the bottom elbow, and put in a set screw in the hole where
 the top elbow is. This would do two thing; significantly
 increase the compensation volume and sensitivity of the
 bladder, and eliminate the protrusion caused of the elbow
 inside the can. I'm pretty confident this will solve the
 issue, but the only problem is I don't have any dive
 plans in the near future to find out.
 Let us know how the trap approach
 goes!
 Best,
 Alec
 On Sun, Jun 14, 2015 at
 5:23 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 Alec,
 
 I just made a discovery, I opened up the tail end of Gamma
 to install my experimental p trap tube.  I put a 1/8 ss
 tube down 24 inches inside my rear ballast tank.  The
 discovery was that there was pressure built up in the drive
 shaft tube.  I did not dive deep enough to create this
 pressure, that means it is from sitting in the hot sun
 (30C)
 
 and expanding the oil.  Maybe our problem is expanding oil
 from hot weather then cooling at depth and sucking in water.
 Well maybe this p trap idea is the solution.
 
 Hank
 
 
 
 
 
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