Lempor exhaust system

The Lempor ejector is a steam locomotive exhaust system developed by noted Argentine locomotive engineer Livio Dante Porta. The ejector's name is a portmanteau of the names of Porta and Belgian locomotive engineer Maurice Lemaître.

In a steam locomotive, draft is produced in the firebox by exhausting the steam coming from the cylinders into the Chimney via a nozzle or 'blast pipe' that creates a vacuum in the Smokebox. The Lempor ejector is a development of similar multiple orifice/nozzle ejectors which create either a stronger vacuum or the same vacuum more efficiently by presenting less 'back pressure' or resistance to the exhausting cylinder.

The modern Lempor ejector consists of four main components:


 * 1) The blast pipe or Tuyere made up of four nozzles which have convergent/divergent sections
 * 2) The mixing chamber
 * 3) The diffuser
 * 4) The Kordina which is so designed that each 'puff' of exhaust steam creates a vacuum in the other cylinder