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Analogy with DFBA most exposed FlexHose [Ref: Laurent Tavian slides July 21, 2009]

Analogy with DFBA most exposed FlexHose [Ref: Laurent Tavian slides July 21, 2009]. Worst feasible case for US: Flexhose with 90 deg bend  LD1 (ID=57.2 mm) If 300 K & 1.5 bar & Mdot =10 g/s  Velocity >> 16 m/s. The case causing the leak: CL line (DN15) 300 K Mdot > 50 g/s

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Analogy with DFBA most exposed FlexHose [Ref: Laurent Tavian slides July 21, 2009]

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  1. Analogy with DFBA most exposed FlexHose[Ref: Laurent Tavian slides July 21, 2009] Worst feasible case for US: Flexhose with 90 deg bend  LD1 (ID=57.2 mm) If 300 K & 1.5 bar & Mdot =10 g/s  Velocity >> 16 m/s The case causing the leak: CL line (DN15) 300 K Mdot > 50 g/s  Velocity >> 25 m/s DFBA-Q7 DFBX-IT (e.g. R5) CD - 22 july 2009

  2. Worst location ! Rigid elbow ? reduced risk 25i2236 CD - 22 july 2009

  3. LD1 CD - 22 july 2009

  4. LD1 CD - 22 july 2009

  5. L5 Synoptic and LD1 circuit CD - 22 july 2009

  6. Typical cool-down – L5 June 2008 CD - 22 july 2009

  7. Preliminary conclusions Case Investigated: -- cool-down realized in 2008 • Helium flow was always small enough to prevent the gas velocity to exceed 25 m/s in the LD1 circuit (QRL to Inner Triplet). • Line chosen by analogy with the DFBA issue. • Largest flow observed = 5 g/s at 300 K  v ~ 8 m/s • We would need at least 15 g/s to reach 25 m/s at 300 K and 1.5 bar Limited risk • Most investigation wrt other flexhose and cool-down/warm-up conditions. CD - 22 july 2009

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