. The science of railways . other whilerunning. What is the difference between priming andfoaming of a boiler? Priming is caused bycontracted steam space or the boiler being toofull of water. Foaming is caused by foreign sub-stances, such as oil, soap, etc., getting into thewater. What would you do in the case of foaming ? Iwould shut off the throttle and injectors and as-certain the true level of the water, by allowingit to settle; then I would open the fire door sothat the engine would not blow off. If the watershould drop too low, I would open the throttleand apply the injectors. If there w
. The science of railways . other whilerunning. What is the difference between priming andfoaming of a boiler? Priming is caused bycontracted steam space or the boiler being toofull of water. Foaming is caused by foreign sub-stances, such as oil, soap, etc., getting into thewater. What would you do in the case of foaming ? Iwould shut off the throttle and injectors and as-certain the true level of the water, by allowingit to settle; then I would open the fire door sothat the engine would not blow off. If the watershould drop too low, I would open the throttleand apply the injectors. If there was a surfacecock, I would open it, if there was none I would 64 DUTIES AND RESPONSIBILITIES handle the engine carefully until reaching a jDointwhere the boiler could be washed out. What would you do if you discovered that thewater in the tank contained oil ? I would pro-ceed as in the case of foaming, until I reached awater station, when I would flush the tank, usingthe heaters in the tank to bring the oil to thesurface. *.
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