702 MODERN GASWORKS PRACTICE
tlie removal of the clinker. A two-way pipe, the function of which. will be explained later, connects the generator and carburettor. Fitted to the top of the carburettor is a centrifugal oil spray. A steam pump, connected with the storage tank, delivers oil to the distributør at a pressure of about 60 1b. per square inch, the oil li.aving been previously passed through, the heater and considerably raised in. temperature. Both the carburettor and superheater are filled with firebricks laid chequer-wise,
Fig. 432.—An Installation of two Humphbeys and Glasgow Plants, showixg Down-PIPES PROM SurERHEATEKS, AND WäSHEES.
the disposition of the bricks aff ording extensive heating suiface for the permanent gasification of the oil. A stack valve is placed at the top of the superheater, and through, this the final products are expelled during the “ blow ’ ’ ; during the “ run. ’ ’ this valve is closed, and the carburetted gas makes its way through the remainder of the apparatus. As will be seen from the figure, the oil heater is placed in the outlet pipe from the superheater, and meets the full volume of the hot gas. With. the exception of clinkering, the plant, in all but the smaller installations, is entirely