Suction gas plants . erein one of the disadvantages of thesuction plant lies. Before a burnable gas is obtained, the fanhas usually to be turned for about fifteen minutes. This defectcould to a great extent be overcome if more attention were paidto the vent pipe. In most plants the pipe is not nearly tallenough. Vent pipes should not be less than 30 ft. high and3 to 4 ins. in diameter. Sharp bends should be avoided, as theyfavour the deposit of soot, and, for the same reason, there shouldbe no long horizontal lengths of pipe. With such a chimney thefan would only have to be used as an auxiliar
Suction gas plants . erein one of the disadvantages of thesuction plant lies. Before a burnable gas is obtained, the fanhas usually to be turned for about fifteen minutes. This defectcould to a great extent be overcome if more attention were paidto the vent pipe. In most plants the pipe is not nearly tallenough. Vent pipes should not be less than 30 ft. high and3 to 4 ins. in diameter. Sharp bends should be avoided, as theyfavour the deposit of soot, and, for the same reason, there shouldbe no long horizontal lengths of pipe. With such a chimney thefan would only have to be used as an auxiliary draught producer,a continuous stream of air from the fan being unnecessary. Thefan is often used to blow the air through the producer instead ofsucking it through. This has the advantage that, the inside ofthe producer being under pressure, any leakage can be detected 74 SUCTION GAS PLANTS. producer should on no account be filled full of fuel up to thehopper door, because there is then a liability of the gas outlet. Fig. 19.—Gas Engine Valve Mechanism. becoming choked, and of the proper production of gas being thusinterfered with. APPLICATIONS AND USES OF THE SUCTION PLANT. 75 The top layer of coal should never be allowed to become incan-descent ; this point can be watched through the sight hole if suchis provided. When the coal in the producer burns through so that the toplayer is incandescent, fresh fuel should be added, and this, undernormal conditions of working, is a general guide to the stoker asto when fuel is required. If, however, air is leaking past the fire-brick lining into the top of the producer, as described above, thetop layer of coal will burn before it ought to, and the cure thenlies in making the firebrick lining tight, and not, of course, inadding fuel. On the other hand, if an insufficient amount of steamis passed through the plant the fuel will burn through morequickly, so that it may mean that more steam is required. The working of the engine is one o
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