Lempor exhaust system

Components of a 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

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  General dimensions for a Lempor exhaust system.

External Links

• "Theory of the Lempor Ejector as Applied to Produce Draught in Steam Locomotives", by L.D. Porta (PDF)
• "A Primer on the Lempor Exhaust"
• "A Lempor Exhaust Ejector for the Garrett"
• Lempor Exhaust on UP Challenger 3985
• "Lempor Exhaust Ejector", Treavor Heath
• "6A and the Lempor"
• Engineering Designer magazine, page 13
• "Oil Firing & Lempor Exhaust Systems"
• "The World's Smallest Lempor"
• "The Lempor Ejector Calculator" (Excel Spreadsheet)