1. Richard Schmitt1 LN Pumping Status Report 12/06/06

2. Richard Schmitt2 Basis The design basis has not changed

3. Richard Schmitt3 Thermodynamic Study Evaluated seven cases Head pressure, Bernoulli’s equation Frictional losses, Darcy’s equation, two- phase multiplier Enthalpy changes –Pump energy –Line heat leak –Camera heat exchanger

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7. 7 Flow Regime Most of circuit is subcooled Worst case with camera vertical Most of circuit is subcooled Highest quality after heat exchanger 0.012 Intermittent flow

8. Richard Schmitt8 Pump Vendor Searched 21 possible pump vendors All except Barber-Nichols are too big B-N has a standard pump that fits

9. Richard Schmitt9 Nitrogen Condensation Cryomech can easily design vacuum flange for pressure Heat exchanger sized for desuperheating will fit in a six inch pipe Cryocooler will be mounted above the vessel, simplifying top of vessel

10. Richard Schmitt10 Does Boiling Cause Vibration? Dzero study with Argon inconclusive Cavitation –In subcooled bulk liquid –Bubbles leave nucleation sites on hot surface, rise into subcooled liquid and collapse –Does not occur in saturated fluid No other study found

11. Richard Schmitt11 Next Tasks Finish cryocooler heat exchanger design Sketch vessel and request quotations Prepare test plan