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CERN P186 Magnet cryogenic system update

Detailed analysis of liquid nitrogen cooling system, diagram included, with recommendations for flexible transfer lines. Cold vent line and fill line specifications provided. Cost estimate also outlined.

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CERN P186 Magnet cryogenic system update

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  1. CERN P186 Magnet cryogenic system update Yury Ivanyushenkov RAL December 7, 2004

  2. Liquid nitrogen cooling system: Diagram Drawn by Peter Titus Cold vent line Fill line

  3. Flexible transfer lines available at CERN Flow in Flow return

  4. CERN flexible transfer line as a fill line Fill volume = 300 l of LN Geometry: 40 m of horizontal flexible transfer line with 4 bends Conclusion: this line is OK as a fill line if both pipes are in use

  5. CERN flexible transfer line as a cold vent line Geometry: 40 m of horizontal flexible transfer line with 4 bends Note: formula for compressible flow is used Conclusion: this line can not be used as a cold line at high mass flow rate.

  6. Cold vent line diameter calculation Question: what is the optimal diameter for the cold vent line ? Geometry: 40 m of horizontal flexible transfer line with 4 bends Note: formula for compressible flow is used Pressure drop of 1.34 bar for 500 g/s Line int diameter 70 mm

  7. Cryogenic system cost estimate (Preliminary and not official !)

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