On 7/18/2019 2:43 PM, Fred J. McCall wrote:
David Spain wrote on Wed, 17 Jul 2019 20:51:19
-0400:

Is helium used for pressurizing both bi-propellants? I would assume so.
But always welcome facts if at hand. I can Google it too if anyone
doesn't already know.


From the descriptions I've read helium is used to pressurize both
tanks and shares piping. Remember, the problem here was a cup of
oxidizer getting over to the propellant side of the helium system and
contacting a titanium valve over there under pressure.



Thanks Fred.

Dave