Energy Systems/Environmental Technologies
LTP technologies for the diesel engines in locomotives
A.S.T. Group has designed and installed more than 4,000 fuel operated heaters (LTP system) for diesel locomotives worldwide in the last 20 years. The system is a fully autonomous and automatic diesel fired heating system that protect locomotives by heating up the coolant water system in the engine block as well as engine oil, air compressor to allow shutting down the locomotive engine, stops the locomotive idling during stopovers. A.S.T.-LTP system is listed as SmartWay verified technologies for locomotives by EPA, it reduces operating costs by saving approximately 95% to 97% fuel consumption compared with idling, and simultaneously reduces green house gas emission, increases the operation life of the locomotive, reduces the surrounding area noise level, and cuts down the service costs.
The system is a high efficiency, isolated, rail-designed heat exchanger, equipped with a two-stage burner with integrated fuel pre-warming, with two of frequency controlled circulation pumps and a temperature controlled 4-way mixing valve, designed as a “Two-Circle-System” to meet optimum heating strategies. The heat exchanger has its own safety controlling logic, a high- frequency-ignition and numerous built in safety features to ensure the system is stable from sea level up to mountainous areas. The system has more than 90% efficiency and meets all pollution-free requirements of industrial oil heating systems.
German Rail has awarded this system as the most efficient and reliable system to avoid idling. The designed life time of the system is more than 15 years, there are numerous systems have been on duty for more than 20 years at the locomotives of German Railways.
Technical key data
| Heat output |
35-50 kW or 50-90 kW
Boiler horizontal or vertical |
| Operating voltage |
24 V DC, 70 V DC, 110 V DC
Voltage converters and stabilizers according to requirements;
battery chargers |
| Protection class |
up to IP 65 |
| Outside Temperature |
down to -40 °F |
| Installation |
as per requirement and customer secification |
Due to the low energy consumption (~ 350 W) the system can run about 3 days out of the charged main battery. For longer parking times an A.S.T. battery charger can be installed.
Input 110 VAC / 220 VAC (± 20%)
Output 70 / 96 /108 /112 VDC
Charging current up to 20 A
Of course the LTP system can be also combined with any start-stop system (AESS). In doing so the number of engine starts can be reduced significantly. Hence the lifetime of engine and cranking motor increase substantially.
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For further information, please contact us.
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