In a convenient stainless fitting drill a 1/16" hole and braze or weld
a 1/8" male AN or female swage fitting on. Run a few inches of 1/8"
stainless tubing to the pressure transducer; adapt the tube to the
transducer by whatever means are convenient. The transducer should
have all stainless parts and at least be washed out with IPA as a nod
to oxygen cleanliness.
If all the fittings are aluminum the same is possible, but it's harder
to weld 1/8" aluminum fittings. If the fittings are done in aluminum
still use stainless 1/8" line, aluminum line that small burns through
too easily.
Cryogenic rated transducers are likely to be out of your price range;
they've certainly always been out of mine. By standing the transducer
off with a bit of tubing only gas can get to the transducer and it
won't get cold. Don't hoseclamp the transducer to the LOX line.
The tubing will act as a snubber and slightly slow the response of the
transducer, but that's not a line you really need high frequency or
super low latency data on.
On Sun, Sep 18, 2016 at 12:38 PM, Kyle Meeuwsen <meeuwsen.engr@xxxxxxxxx> wrote:
Hello All,
Any suggestions or things to be wary of when implementing a pressure
transducer before engine injection on a LOX line for a test stand? We are
expecting less than 500 psi with flow rates between 4 and 10 gallons per
minute. I was expecting that I could add a union tee in the line with an npt
fitting to tighten the transducer directly onto.
I have not looked at any part specs yet since there are so many questions
that I need to answer such as should it be cryo rated, should it be placed
directly on the line or distanced off of it, is cavitation a concern in a
swaglok Union tee, etc...
Thoughts?
Best,
Kyle Meeuwsen
