How can I ensure 1/2lpm o2 flow to a trach when using >12ft tubing? Or should I cut the tubing?  

R u titrating O2. Nbrh rt (deb) asking -r u using 50psi air compressor with a separate o2 source - if so squat down look at flow meter make sure it is < 1l, check pulse 02 is normal per rx (>90%).