[PSUBS-MAILIST] O-ring Question

[Alan via Personal_Submersibles]

Thanks Cliff, good link.
It was just that 1 O-ring in the bore that I wasn't sure of the
stretch required.
I have re-designed my light housing ( will post it later) & are
pretty happy with it. The big thing will be how many Watts I
can run it at without it overheating.
Alan

Sent from my iPad

> On 7/02/2017, at 4:12 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, the easiest way to get the perfect O-ring grove is to go to http://divapps.parker.com/divapps/seal/mobile/MaterialSelection/MobileinPHorm.aspx  which is Parker's in PHorm software running as an online app.  This site completely specs the gland and gland seat under just about  any loading condition you can think of and prints out a nice report including a diagram of the grove with all the correct dimensions.  It is lot easier than trying to digest the 170 page Parker O-ring book.  On stretch for this application, I concur with Dan's comments.
> 
> Cliff
> 
>> On Sun, Feb 5, 2017 at 7:32 PM, 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, sealing
>> between 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-ring
>> in a bore groove. I did see that in a rotary application they don't advice that
>> their 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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