Horizontal Water-Tube Boilers - Worthington Water Tubes Nearly Horizontal Steam and Water Drum Horizontal Straight-Tube Single-Tube Sectional

HORIZONTAL WATER-TUBE BOILERS - WORTHINGTON: WATER TUBES NEARLY HORIZONTAL, STEAM AND WATER DRUM HORIZONTAL, STRAIGHT-TUBE, SINGLE-TUBE, SECTIONAL Construction. This form of boiler is much the same in principle and operation as the Babcock & Wilcox boiler, but the parts are differently proportioned and arranged; see Fig. 47. The furnace extends under the entire boiler, and the tubes are set over it close together in oppositely inclined series. No flame walls or baffle plates are used.

Boilers up to 125 H. P. are usually made to fire at the end as shown in Fig. 47, in which the tubes extend across the furnace viewed from the front, and the steam and water drum is at right angles to the tubes. In the side-fired boilers the tubes extend from front to back, and the steam and water drum from side to side; this arrangement is better adapted for large units and for setting in battery. The tubes of each vertical row are expanded into straight headers which contain seven or eight tubes. See Fig. 48. Opposite each tube is a hand hole. These headers are arranged close together, forming the boiler enclosure.

Circulation.

The feed water enters the steam and water drum and the circulation carries it down to the mud drums through large circulating tubes which are outside of the furnace. See Fig. 48. From the mud drum it enters the lower series of headers and rises through the inclined tubes over the fire into the upper headers.

The water now containing bubbles of steam enters the steam and water drum by means of short tubes shown in Figs. 47 and 48. The covering for this boiler is an iron casing, no brick being used except to enclose or line the furnace.