Chimneys for Flame Disc Burners with Large Flame Disc

Starting with rather small flame discs (described above for the shoulder chimneys), larger discs were gradually designed as the burners used became larger and more powerful. The aim now was not necessarily to draw the flame upwards through the accelerated air flow, but rather to widen and enlarge it. These flame discs could not be operated with the conventional shoulder chimneys, because the flame now needed more space. Therefore, the shape of the shoulder chimney was changed: The lower part is cylindrical as with shoulder chimneys, only imperceptibly wider (approx. 1-1.5 mm) just before the shoulder starts. Kleemann's chimney for the 20'' Elite burner exceptionally has a small bulge (see table below). Only above the flame disc is the diameter reduced, not abruptly in a significant step as with shoulder chimneys, but with a slight curve in a softly pronounced shoulder, and the chimney retains this smaller diameter upwards, sometimes even tapering slightly. The shape resembles a squat wine bottle with a longer neck. Because of this shape, these chimneys are called bottle-shaped chimneys.

Bottle-shaped chimneys for burners with large flame disc (shown in their correct size ratio to each other - Top row: marks of the chimneys shown)
From left: Chimney for 14’’’ Solaröl burner, C. Kneusel or Max Kray
Chimney for 20‘‘‘ Prometheus burner, Stobwasser
Chimney for 20‘‘‘ Columbus burner, Kindermann
Chimney for 20‘‘‘ Elite burner, Kleemann
Chimney for 20‘‘‘ National burner, Eckel & Glinicke
Chimney for 30‘‘‘ burner

A burner with large flame disc and its bottle-shaped chimney
From left: 20‘‘‘ Intensiv burner of Schubert & Sorge, with bottle-shaped chimney
Schematic representation of the air flows and the flame
The flame of the burner

The bottle-shaped chimney is thus more related in shape to the shoulder chimney, even though it is larger in diameter. This type of chimney is rarely found, although it was the definitive shape for larger burners with the flat flame discs until the advent of the hat-on-a-sieve-tube flame discs.

If you examine old burner catalogues, you will quickly discover that many German manufacturers had burners in their range that required a bottle-shaped chimney to optimally develop their flame. These included, for example Staat burner by Schwintzer & Gräff, Prometheus burner by Stobwasser, Columbus burner by Kindermann, Germania burner by Brendel & Loewig and by Eckel & Glinicke (all in Berlin), Intensiv burner by Schubert & Sorge in Leipzig, Adler burner by Kästner & Töbelmann in Erfurt, to name but a few.

Chimney Sizes

In the following table I have compiled the relevant dimensions of the bottle-shaped chimneys. I have based this on the chimneys that I have in my collection.

Table: Bottle-shaped chimney