Horizontal Water-Tube Boilers - Atlas Water Tubes Nearly Horizontal Steam and Water Drums Cross Type Horiztonal Straight-Tube Single-Tube Non-Sectional

HORIZONTAL WATER-TUBE BOILERS - ATLAS: WATER TUBES NEARLY HORIZONTAL, STEAM AND WATER DRUMS (CROSS TYPE) HORIZTONAL, STRAIGHT-TUBE, SINGLE-TUBE, NON-SECTIONAL This make of water-tube boiler does not need a full description as Figs. 52 and 53 show both the general arrangement of parts and the details of water-leg construction. The general description of the Heine boiler is applicable to this type. A few points of difference, however, should be pointed out.

There are three drums running crosswise the tubes. The front and rear drums are made of the same plates as the water legs. This is shown in the illustrations. The reasons for this method of construction are that it gives a " throat" area of about 80 per cent of the area of the leg and prevents all seams from coming in contact with the furnace gases. The two drums are connected on the water line by equalizing tubes. In the rear drum, a water purifier receives the feed water which passes down the rear leg, then through the tubes to the front leg. In the last portion of the tubes, much of the water is converted into steam which flows through the front drum and the superheating tubes to the small upper drum. The water flows through the equalizing tubes to the rear drum and joins the current of feed water.

The front drum is made 30 inches in diameter, the middle drum 24 inches. and the rear drum 42 inches. The tubes are 4 inches in diameter and the longest are 18 feet in length.