Tuesday, November 13, 2018

Random misc stuff...

Lots of little things....

It looks like the Fuel in 20Kg lots is about 50% lower cost.
If one eventually gets to ton quantities then its down to 18% of the present cost.
So all of that is good news....

I've been thinking that I was going to have to manufacturer my own quick disconnects.
Everything I'd found was either too big, to heavy or to expensive.. (often all three)

After a help me beg on Arocket a friend pointed me at some things on E-bay that eventually led me to these...

They are Aluminum, with viton and stainless internals. Off the shelf and not too expensive. The Really cool part is the rocket side is only 49gm!

They are available from multiple places look for FBM3314 and FBM1153. The only way they could possible be better is if they were AN fittings rather than pipe, and availible in multiple sizes. (For all of you that don't do high pressure plumbing, please realize pipe threads are horrible.)

In Pauls  pantheon of pliumbing....
  • Last choice is pipe thread.
  • AN flare fittings are ok to pretty good. Probably not good enough for directly hazardous materials near people. 
  • Swageloc are good, but both pricey and heavy.
  • The Big boys use stainless and all orbital welded connections...
That's it for Today....

3 comments:

Wes Calvert said...

Hi Paul, just searching quickly, I'm seeing plenty of aluminum AN quick disconnects, typically used for car fuel systems. Try searching for QDS08 or Jiffy Tite 21406. I wonder if something like that would work?

Paul Breed said...

At least the jiffy-tite have brass innards, ok for fuel , not ok for the oxidizer...
But having a completly differnt brand of fitting for fuel and oxidizer is a really good thing.

Carl Tedesco said...

QD's with AN fittings:
https://fuelsafe.com/dry-break-quick-disconnect-fitting-qds06/
http://www.stahlbus.com/info/en/products/quick-disconnect-couplings