Modern Gasworks Practice

THE HORIZONTAL RETORT BENCH -i and the considerations to be kept in view in order to ensure long life and effective working are dealt with. under their respective headings. (a) Main Arches The stability of the bench. must be ensured, and the tendency of the pier walls Fig. 26.—Sbction through Wastb-Gas Flues. to lean slightly from the vertical (due to the thrust of the main arch.es) must be checked by the erection of substantial end walls and suitable bracing. When the bench. contains more th.an (say) four beds, tliese buttress walls sh.ou.ld neverbe built less th.an double the thickness of the ordinary pier walls, whilst it is only necessary to construct the inner 9 inches of firebricks. For reasons mentioned. later (see