This modification requires little Illustration. For Ljungstrom type Airheaters, the addition of an extra Axial Seal seal fixing plate is simple. We have modified all units at Drax, most of the
units at Ferrybridge and one at Didcot previously.
Axial Sealing is a secondary leakage measure to deal with rotor Bypass flow. It has been effective on all sites when coupled with good Circumferential Sealing.