Draw neat and labeled sketch of three pass packages type boiler.

Draw neat and labeled sketch of three pass packages type boiler. 
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Answer :

Each set of tubes that hot combustion flue gas travels through before making a turn within the boiler, is considered a "pass." A 3-pass fire tube boiler design consists of three sets of horizontal tubes, with the stack outlet located on the rear of the boiler. A downdraft design keeps the cooler water from having an effect on the hot surfaces within the boiler. A boiler with more passes provides more opportunities for hot gasses to transfer heat to the water in a boiler and operate more efficiently; however, boiler efficiency is highly affected by tube design, and not simply the number of passes. It is possible for a 3-pass boiler with a tube design that allows more heat transfer time to deliver the same or higher efficiency rating. 

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