Venting HP gas: tubing specn.

We are installing a panel which has a number of valves to allow a pump to pressurise Nitrogen gas to 15,000 psi (1034 bar).

We want to run the vent (bleed off) lines into the existing pipework which is 1/2" OD x 0.064" wall x 316SS tube.

On the previous system we installed I used the same specn tube as for the HP test i.e. 20K rated 3/8" OD x .203" ID.

I am concerned that should the icing during venting up close up the bore of the 1/2" tube so that back pressure could build up and burst the pipe, or will the velocity allow the bore to be maintained to prevent this?

help please