[AR] Re: Explosive decompression of wallet with o-rings
- From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Mon, 24 Aug 2015 09:15:09 +1000
FEP-encapsulated silicone ones are nice for non-cryogenic face seals,
by the way. You get most of the material compatibility of teflon but
without the total lack of springiness of teflon o-rings, and they're a
lot cheaper than stainless spring energized teflon o-rings.
I say face seal because they share the teflon characteristic that they
can't really be stretched in the major diameter. You could probably
cram one into a large female gland seal, but a male gland seal like
SAE ORB is usually right out.
You can fit one onto a male gland in some situations, but it's difficult
although it's something I've done hundreds of times (not always successfully
though). The gland really needs to be a large enough diameter with no sharp
leading edges because you really need to minimise the stretching and the
cross-section of the seal should be thin enough because you want the groove
depth to be as close to the outer diam as possible to minimise the amount of
stretching required. The key is to heat the seal up to as high as possible for
the installation. Normally boiling water temps are enough for the installation.
Ideally if you can maintain a high temp in the material for the installation
process, that's beneficial. It's also really important to distribute the
stretching of the material to as much of the entire ring as possible -
localized stretching will nearly always permanently damage the ring.
Troy
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