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Priming and Foaming in boilers

both refers to carryover of water on to the steam outlet.
Priming:
it is due to various mechanical and physical aspects like high boiler water level,rapid steam demand,
saftey valve lifting frequently due to some malfunctions,rough weather and high salinity.
Foaming:
this occurs mainly due to contamination or impurities like in case of oil contamination unbroken chains of bubbles are formed causing carryover
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