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Large cold clearence

  • P1 = P2
  • Seal elements not in contact with support
  • Seal rubs avoided
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Small operating clearance

  • P1 >> P2
  • Seal elements in contact with support
  • Minimum leakage for performance gain
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Increased shut down clearance

  • Δ P decreasing with RPM.
  • Seal elements retract from support.
  • Seal rub damage avoided.

Challenges Solved

ProblemSolution
1. Misalignnment and distortion ▶ Initial conformal 'wear-in'
2. Rotor Rubs ▶ Avoided with large startup & shut down clearance
3. Seal leakage ▶ Minimized with < .004nch operating clearance
4. Seal Life ▶ Non-contacting operation
5. High Pressure ▶ Design features to accommodate high pressure.
6. Blade Tips (interrupted seal surface) ▶ PALS leaves shown to be undisturbed

Summary Brochure

Styles for Available Seal Space

Welded or Bolted manufacturing possible for either design

1. PALS from strip stock

styles available

2. PALS from sheet stock

styles available