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In Babcock & Wilcox Water Tube Boiler the tubes can be
cleaned or replaced through
hand-holes that are place ahead of each tube. The collecting
boxes, on the boilers front side, are in the down-end connected to a mud
disposal box with a blow down valve. The upper end of the collecting boxes by
means of elbowed pipes connected to the lying steam drum. The collecting boxes
at the water tubes rear side are closed at both ends. From the upper ends are
tubes connected to the steam drum above the water level. At normal conditions
the water level will be little below the mid-point of the boilers steam drum.
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A water tube boiler
consisting in its simplest form of a horizontal drum from which is suspended a
pair of headers carrying between them an inclined bank of straight tubes.
In a Babcock & Wilcox Water Tube Boiler are the
water-tubes lying, but slightly inclining towards the boiler front. The tube
ends are connected to a number of vertically collecting boxes with almost
quadratic cross section. These are made of sheet metal and are laterally wave
shaped.
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