Suction gas plants . the place of the gasbag used in a pressure plant, and is for the purpose of reducingthe suction of the engine on the producer during the suctionstroke, and thus enabling a more even flow of steam and airthrough the fuel during the four strokes of the cycle. It is, ofcourse, very much smaller than the gas holder used with pressureplants, and should preferably be three to four times thevolume of the engine cylinder. In many cases the volumeof the piping between scrubber and engine is sufficient forthis purpose. DETAILS OF CONSTRUCTION. 35 Features of a Good Suction Producer.
Suction gas plants . the place of the gasbag used in a pressure plant, and is for the purpose of reducingthe suction of the engine on the producer during the suctionstroke, and thus enabling a more even flow of steam and airthrough the fuel during the four strokes of the cycle. It is, ofcourse, very much smaller than the gas holder used with pressureplants, and should preferably be three to four times thevolume of the engine cylinder. In many cases the volumeof the piping between scrubber and engine is sufficient forthis purpose. DETAILS OF CONSTRUCTION. 35 Features of a Good Suction Producer.—The constructionmust be as simple as possible, consistent with efficiency. By having a suitable steam raiser and the capacity of thegenerator rightly proportioned to the cylinder volume, when achange of load on the engine occurs, the producer should auto-matically respond to the new conditions, and not require adjust-ments of its steam or air supply. The generator should be provided with a poking hole and suit- i. -C(~ ^ \.m>^Drain Co ti- ?rrri-f III! il ?^ij Ex pan si on^ jj Chamber Fig. 14.—The Expansion Box. able cleaning doors, making the interior of the generator easilyaccessible, so that clinker can be removed while the plant is inoperation. This is an important attribute, as it enables an engineto work continuously for an indefinite period, without the require-ment of a stand-by generator. The firebrick lining of the furnace should be arranged so asto be quite accessible, so that clinkers can be removed withouttrouble. Moreover, if the interior is not easy to get at, thelining is likely to be badly done in the first instance. Therewill be defective joints which let in air and produce intense 36 SUCTION GAS PLANTS. heat in the vicinity, thereby spoiling the brickwork andforming clinker. The hopper, as we have seen, should be designed so that no aircan find its way into the furnace while charging. The vaporisershould also be accessible, easily cleaned, and of as si
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