[PSUBS-MAILIST] innertube compensator

[Alan James via Personal_Submersibles]

Hank,I used the inner tube when I was experimenting with compensatingabsorbed glass mat batteries. I had two plumbing fittings in the top of the batterywith the section of inner tube with a valve in it clamped between them.I had the battery & tube full of baby oil (scented mineral oil). I then pumped upthe inner tube to keep an over pressure in the battery.There was something, either the chemicals added to the mineral oil , or the mineraloil, or battery acid & gasses that might have mixed with the mineral oil that caused the inner tube to melt in a relatively short time.Another messy experiment that didn't work. I suggest soaking a section of inner tube in the compensating fluid & checking it occasionally.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Wednesday, January 14, 2015 7:41 AM
 Subject: [PSUBS-MAILIST] innertube compensator
   
Alan,
You mentioned that you had trouble with using an inner tube as a pressure compensation bladder.  What type of oil were you using.  I have had mine installed for a few months now and seems fine.  I just overhauled my drive and reinstalled the inner tube.  You got me worried  :-)
Hank
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