[PSUBS-MAILIST] p trap

[hank pronk via Personal_Submersibles]

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