On Tue, 29 May 2018 19:10:28 +0100, Steve Walker
wrote:

On 29/05/2018 09:05, The Other Mike wrote:

The hydrogen being sealed on the interface between the rotating shaft and the
outside world by pressurised oil.

Is that a multiple labyrinth seal with an oil seal between sections?
That's what we used to use on large axial and centrifugal compressors
for flammable gases.

Yes
--