Modern Gasworks Practice

512 MODERN GASWORKS PRACTICE SIDE ELEVATION. openings in tlie bottom tray and through the liquor-sealed serrations of the hoods until it passes to the outlet at the top. The “ Multiple ” washer (Fig. 316) is an American type. It is designed 011 lines very similar to the Livesey type, horizontal in-verted U-section troughs being used for breaking up the gas. To the lower edges of each U-trough three perforated plates, set out at a wide angle, are attached. The plates are set one above the other, but are so arranged. that the distance they project decreases from the topmost downward. The perforations in these plates decrease in diameter and increase in size from the bottom upwards, whilst their edges are serrated. The principle of Walker’s washer is shown. in Fig. 317. The gas from the inlet pipe enters a central chamber, branching away from which are a number of longitudinal troughs, open at the bottom but closed at the far end. The level of the liquor in the cast-iron external shell is such that the lower ends of the troughs are sealed, Fig. 316.—The “Multiple” Washer.