[PSUBS-MAILIST] pressure test

[hank pronk via Personal_Submersibles]

 Alan, this circuit board does not have large capacitors, they are only about 3\16 in dia and same height.  Anyways 3,000 psi = no problem.Hank
    On Sunday, April 15, 2018, 1:06:34 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Brian,most of the led drivers, motor controllers or buck / boost units have those large cylindrical electrolytic capacitors which can crush under pressure. At the top of them most have a cross cut in them to weaken them at that point so if they blow they blow in a controlled direction. They would be particularly weak at that point with regard to crushing.    I am not sure how the capacitor would operate once it was crushed;whether it wouldn't work at all, or partially work, & whether that wouldresult in the circuits failure or just reduce the life of the circuit.I read about this on the Psub list & other web sites years ago, so theymust have a history of failing under pressure.Alan

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On 15/04/2018, at 6:34 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Alan,                   What type of capacitor is good under pressure ?  Brian 

--- personal_submersibles at psubs.org wrote:

From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] pressure test
Date: Sun, 15 Apr 2018 14:07:17 +1200

Hank,probably me advising caution about pressurising the LED driversas most I've seen have large electrolytic capacitors that can becrushed under pressure. Alan

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On 15/04/2018, at 8:04 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


Today I pressure tested my LED light circuit board to see if it can handle the pressures Scott's P6 will see.  I am happy to report the circuit board survived one hr at 3,000 psi soaking in oil.  I was very cautious, because I kept hearing Hugh yelling at me from NZ  at least I think it was Hugh.  I stayed in Gamma and the pressure chamber was under Gamma while I pressured it up.  Hank

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