There are two primary fire tube boiler designs: “Wetback” and “Dryback.” Wetback design has water around the rear reversal chamber, whereas the dryback design has refractory lining the rear end plate.
We have ASME certificate for produce boiler & pressure vessel.
Water heated to the boiling point vaporizes into steam known as the “Saturated” steam. When this water is further heated above the boiling point without any change in pressure, dry steam known as “superheated” steam is generated.
Every time hot flue gases pass through a set of smoke tubes or furnace tubes before making a turn, a “pass” is said to be made. In our three-pass design, the gases first pass through the furnace tube –this is the first pass. After that, they pass through the smoke tubes –this is the second pass. And in the end, the gasses take a turn and pass through another set of smoke tubes –this is the third pass. This design ensures maximized heat transfer.
A wetback fire tube boiler design:
Quick response to load changes
Requires less maintenance due to the absence of refractory