[PSUBS-MAILIST] O-ring Question

[Alan James via Personal_Submersibles]

Thanks Hank,I have 4 O-rings in my light design & had gone through the calculationsbefore designing. However one of these O-rings is in the bore groove  & I'mhaving a re-think about this one, but can't find any specific advice forthis application.Alan



      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, February 6, 2017 2:59 PM
 Subject: Re: [PSUBS-MAILIST] O-ring Question
   
Alan,If your glass is say 2 inces diameter then use a 2 inch o-ring with a groove design from the o-ring groove chart.  You will also find a spec for the clearance between the glass and housing. 

    On Sunday, February 5, 2017 6:52 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hi Sean,yes had a quick look through that, along with other material.Spent a couple of hours & still haven't come up with an answer towhat seemed a simple question!Maybe I'll have to read through it slowly!Cheers Alan

      From: Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, February 6, 2017 2:39 PM
 Subject: Re: [PSUBS-MAILIST] O-ring Question
  
Alan, do you have a copy of the Parker O-ring handbook? Best free resource out there for designing O-ring seals. ORD5700.pdf  Download it from the Parker website.Sean


On February 5, 2017 6:32:51 PM MST, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 Hi,am having trouble Googling an answer to this question.   I have an O-ring groove in the bore of my light housing, sealingbetween the bore & the side of my acrylic lens as per attached diagram.On a piston O-ring groove it calls for an optimal 2% stretch & not more than 5%.I can't find any reference to what stretch if any should be, if any, for an o-ringin a bore groove. I did see that in a! rotaryapplication they don't advice thattheir should be any pressure on the rotating rod.Should I be designing so that the o-ring will have a 2% stretch around the lens?Thanks, Alan
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