[PSUBS-MAILIST] oil compensation

hank pronk via Personal_Submersibles personal_submersibles at psubs.org
Sat Sep 16 16:47:26 EDT 2017


 Alan,I would never connect an air compensating system to my main HP supply.  That would be too risky for me.  There are times when there is lots going on and a leak could go undetected.  I am sure Cliff has bells and whistles to let him know.  Hank
    On Saturday, September 16, 2017, 2:23:08 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank,I did a lot of initial experimentation with the system Cliff is using.I bought 4 relieving regulators & pulled them apart. Unless the regulator is fully stainless, you need to change out parts in thespindle section. At the time I was looking at $40- plastic "Festo" regulators,but couldn't find a suitable replacement spring. Cliff's little regulatorwas going to cost me about NZ $400 & I had wanted one for eachthruster. The system Cliff is using is good in that if you have an oil compensatedthruster the oil would just be replaced with air if it leaked out.He is using his on air compensated motors, so the volume going throughthe regulator, & being relieved, is huge compared with what would flowwith a air over oil system.It's good to bounce this off people. I am thinking I would need a dedicatedair tank for Cliff's system to be G.L. or ABS compliant. So more volume cost& hassle.If I had air over oil I could have one regulator & still see if one thruster was leaking more than another. If I go with the traditional rolling diaphragm & spring type compensator it will be easy for me to put in a low level switch.If I went with my weight instead of the spring, then I may add 25lb moreweight than is necessary.Will ponder this some more!Cheers Alan


Sent from my iPad
On 17/09/2017, at 6:52 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


 
Alan,I would have to vote for the set up Cliff has unless you are planning to be able to jettison the motors.  Oil compensating is so much easier to jettison.  I suppose though you could have a HP tank jettison with the motor.  Hank
    On Saturday, September 16, 2017, 12:21:01 PM MDT, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 I wasn't suggesting regulated air compensation, but rather fixed-volume
oil compensation, with regulated air to provide the positive pressure on
the compensator rather than a spring.  In that case, a failure of the
air system just leaves you with compensation at ambient pressure.

Sean


On 2017-09-16 10:06, Alan via Personal_Submersibles wrote:
> Thanks,
> yes if the sub were on an angle the weight could get lodged in position
> temporarily, or lose some of it's force on the rolling diaphragm. 
> But in the worst case this would leave the oil compensated at ambient.
> I looked seriously at Hugh / Cliff's system with the regulated air supply
> giving an over-pressure on my oil filled thrusters, but you would probably
> need a dedicated air tank in case of a major leak, or more valves &
> through
> hulls to be able to turn the air off. Also the stainless regulator was
> more than 
> what I wanted to pay. 
> Cheers Alan
>
> Sent from my iPad

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