[John, Chandra]

Closed WP 7021

We tested CP4's LN2 vaporizer for leaks by first blanking the exit of vaporizer with 15 psig pressure relief valve (works) and gauge. Pressure held at around 10 psi with LN2 bottom draw valve fully open. Then we connected the new flow meter at outlet and let LN2 flow freely for ~30 minutes. We tried to increase the flow rate by increasing Dewar pressure but realize this can take days. The highest flow rate we saw on meter was 5,000 SCFH, but it mostly ran closer to 2,000 SCFH. PSI procedure calls for 5,300 SCFH for regenerating short CPs. No cracks found in CP4 vaporizer. No visual cracks in CP3 vaporizer (not pressure tested yet). CP 5,6 do have cracks in the aluminum at inlet and outlet. Bubba thinks he can fix the welds: FRS 8282.

CP4 regeneration line now has a new flow meter and is properly reassembled.