English to German Tech/Engineering Petroleum Eng/Sci centrifugal fans for petroleum/gas/chemical industry

Es geht hier um Arten von Wellendichtungen für Ventilatoren.

Shaft seals, including labyrinth, floating bushing, close clearance annulus, felt or cloth, or honeycomb types, shall be provided to minimize leakage from or into fans over the range of specified operating conditions and during periods of idleness. Seals shall be designed to operate for process conditions that may vary during start-up and shutdown or any special operation specified by the purchaser.

Diese spezielle Dichtung kenn ich leider nicht.

Vielen Dank im voraus.