Hi Poll....some great images and good fun by your members

An interesting scenario I see was with the big steam tug
1. have heard of preheating the boiler to save gas, however in OZ being warmer [weather] this is usually limited to using hot water to fill the boiler...is that the external gas burner external mounting ring of the boiler that is
glowing ? courtesy of the external gas bottle flame?
2. the other image had me wondering.......is the gas tank as used being externally re-pressurised with the foot pump

....or does it add air to improve the combustion?

....
3. but at least the
FIRE extinguisher is handy.

.....
Would be most interested in understanding these processes a little more....Derek