Roger Waller & DLM

DLM Preheater

This system allows a boiler to be brought up to a pressure of 10bar (145psi). Boiler water is heated electrically and pumped in the boiler. The system is closed, in other words the heated water pumped in to the boiler forces water then in the boiler out and through the preheater. The system heats the water gradually having the effect of evenly warming the boiler from the water side and not the fireside.

The advantages are many and include:

Unattended steam raising.

Less stress in boiler and firebox plates due to even and gradual heating.

No local pollution during steam raising, often a major irritant for neighbours of steam sheds.

Immediate availability of atomising steam for oil fired locos when the fire is lit.

Immediate availability of the blower when the fire is lit.

BRB No.15 in the shed at Brienz plugged in to the preheater (which itself was not plugged in.) October 8 2003

The DLM preheater. October 8 2003

For a schematic of the preheater click on the image above.

This is the point at which the heated water is plugged in to the logo to be routed to the boiler. October 8 2003

The centre valve is the exit point for boiler water on its' way to the preheater. The valves are proprietary pressure vessel fittings and not made specifically for this type of locomotive. October 8 2003

Also see the DLM Website.

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