The water is blown out of the boiler with some force by steam pressure within the boiler; and was customarily expelled downward to avoid the safety hazard of showering hot water on nearby individuals.
The water is blown out of the boiler with some force by steam pressure within the boiler. Bottom blowdown used with early boilers causes abrupt downward adjustment of boiler water level and was customarily expelled downward to avoid the safety hazard of showering hot water on nearby individuals.