Usines de gaz d'aspiration . Fig. 23.—revêtement En Brique De Feu et Grat du producteur. Ces portes sont montées, mais pour les puissances supérieures, deux sont faites, un de chaque côté du tubage. La présence des deux portes rend itrelativement facile de dégager les cendres et le clinker dans une grande plante, car ils peuvent être poussés à travers une porte de l'autre. La porte supplémentaire de l'astral est fixée à l'arrière de la grande porte pour permettre l'élimination de la cendre du haut des barres d'incendie lorsque LES APPLICATIONS ET LES UTILISATIONS DE L'USINE D'ASPIRATION. 89 l'usine est en service. Les fabricants prétendent que l'utilisation de steelplate donne de la flexibilité au prod

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Suction gas plants . Fig. 23.—Firebrick lining and Grate of the Producer. these doors is fitted, but for higher powers two are made, one oneach side of the casing. The presence of the two doors makes itcomparatively easy to clear away ash and clinker in a large plant, as they can be pushed out through one door from the other. Asmall supplementary door is fixed to the back of the large door toenable the ash to be removed from the top of the fire-bars when APPLICATIONS AND USES OF THE SUCTION PLANT. 89 the plant is at work. The makers claim that the use of steelplate gives flexibility to the producer body, allowing it to expandand contract readily at will. They state that the fractures thatoccur in cast-iron bodies are frequently due to the absence ofsuch flexibility. The body is lined internally with firebricks. A view of thislining is shown in fig. 23, which also shows the fire-grate andbridge-piece round the door opening into the generator at the. Fig. 24. —Ashpan and Body of the Producer. bottom. This producer has a layer of sand between the firebricklining and cylindrical body, as in the Crossley producer, and thebottom layer of bricks is well set in fireclay all round, so that allcrevices through which air might enter are stopped up. The ashpan only is made of cast iron, because the latter offersgreater resistance to corrosion, than a steel plate. The methodsometimes adopted of making the ashpan and generator body inone piece and of steel plate is represented in fig. 24. This isusually only about ^-in. thick ; and as water is usually prevalent 90 SUCTION GAS PLANTS. externally, and absolutely necessary internally, it is seen that thistype of construction is very liable to corrosion. A cast-iron ashpanis, on the other hand, usually about |-in. thick, and, by its verynature, is less liable to corrosion than steel. When corrosion doestake place, so that air is admitted into the generator by any butthe right channels, the worki

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