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Posted by DD on December 12, 2009 at 15:53:02:
In Reply to: Re: drum level shrink and swell posted by sid on January 28, 2008 at 06:39:26:
Shrink and swell is caused by the amount of heat input from you burners. When the firing rate increase on a load increase you will increase the steam bubble formation in the steam drum and displace the water and it is seen as a swell. The reverse happens when you decrease the firing rate (reduce heat input) and you loose some steam bubble formation. Ever notice when you boiler trips on a interlock interlock, the drum level drops like a rock. It because you loose all the heat and your steam bubble collapse very rapidly and your drum level drops.
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