Hi
I am looking for a bit of advice on cleaning for a hose for N2O. The hose
Im cleaning is a used to transfer liquid N2O from a large bottle to a much
smaller one.
The hose is 10 feet long, stainless steel braid wrapping over a PTFE core.
Tube ID is 0.25 inch. End fittings female 37 degree flare, ¼ inch (I think
its a -4).
With a smaller 12 inch tube I used the same process for cleaning other
oxidizer equipment. Start with mechanical cleaning, three times with soap
and hot water with tap water. Last wash, it was raised thoroughly. Then,
I place the part in an ultrasonic cleaner for 30 minutes at 80 deg C, using
Blue Gold Cleaner and deionized water. Afterwards, it goes into a hot raise
bath. Raise water is distilled water. Next is another distilled water hot
raise bath; then, a cold raise bath. Finally, the part is soaked in a bath
of 100% isopropyl alcohol. Part is removed an let dry. Dries until I can
no longer smell the alcohol. After second mechanical cleaning, nitrite
gloves used during all handling. Parts not directly assembled are double
bagged with date.
What should I do with a 10 foot hose? One thought is to put isopropyl
alcohol in it and vigorously shake. Then drain and blow with bottled
nitrogen until you cant smell it anymore.
Any suggestions will be appreciated.
Thanks,
Rick Wills
Huber Heights, Ohio