[PSUBS-MAILIST] p trap

[via Personal_Submersibles]

Alec,
Could you tap a small block and weld/adhere it to the top of the can for  
the entry point for your elbow?  That would eliminate any protrusion into  
the top of the can.  You could substitute a T with a bleed for the elbow  and 
even add another fill point at either the top or the bottom.
Jim
 
 
In a message dated 6/14/2015 5:02:35 P.M. Central Daylight Time,  
personal_submersibles at psubs.org writes:

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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