Typo for "trash screen".

Pour les turbines hydrauliques :

"A trash screen is a type of fencing used to filter out debris in the path of a waterway. This is a helpful tool in keeping streams, rivers and lakes free of trash and unwanted elements. The basic design of all trash screens is similar, but internal, external and turbine-powered screens each serve different needs. Screens also can be made of different materials.

A basic waterway trash screen is made from any type of meshed material that allows water to pass through but holds back large pieces of debris. A trash screen usually is made from the same materials as many fences, such as metal or plastic. Depending on the waterway and the amount of pollution that passes through, screens often need to be cleaned regularly in order to avoid waterway blockage. "
http://www.wisegeek.com/what-is-a-trash-screen.htm

Pour les turbines à gaz (admission de l'air): empêcher les impuretés ou les glaçons de pénétrer ds la turbine.

"Conversely, in very cold environments it is necessary to avoid icing of components such as inlet filtration and the trash screen, silencers, and inlet guide vanes."
www.gepower.com/prod_serv/products/tech_docs/.../ger3419a.p...