Suction gas plants . Fio. 26.âAnother View of Ashpan, showing the Fan for starting upthe Plant. which is closed by a water seal. The gas is introduced on oneside of this partition, passes downwards round the bottom andup the other side of the separator. The heavier particles of dust,however, not being able to change their direction so readily,continue their downward movement and are trapped by thewater seal. For plants of 50 and upwards the separator is alsoarranged to act as a superheater. The gas passes through thissuperheater, and is made to give up a large proportion of its 92 SUCTI
Suction gas plants . Fio. 26.âAnother View of Ashpan, showing the Fan for starting upthe Plant. which is closed by a water seal. The gas is introduced on oneside of this partition, passes downwards round the bottom andup the other side of the separator. The heavier particles of dust,however, not being able to change their direction so readily,continue their downward movement and are trapped by thewater seal. For plants of 50 and upwards the separator is alsoarranged to act as a superheater. The gas passes through thissuperheater, and is made to give up a large proportion of its 92 SUCTION GAS PLANTS. waste heat to the air and steam on their way from the vaporiserto the fire. The bottom of the scrubber is itself formed into a water seal, s. Fig. 27.âGenerator of Suction Plant. into which the gas pipe dips. The amount of seal required is ^ |-in. (3 to 6 mm.) according to the size of plant. This can beadjusted by lowering or raising the overflow pipe from thescrubber to the water seal previously mentioned. APPLICATIONS AND USES OF THE SUCTION PLANT. 93 The joint between the steel casing of the producer and thecast-iron ashpit is made of soft asbestos pulp or similar materialcaulked in. That between the producer body and evaporator is ofred lead and asbestos cord. The joints on gas piping and doors areall made with asbestos sheeting. Other materials may be used,but must be fire-resisting where they come into contact with gas,and water-resisting if required to withstand water only. The complete arrangement of a 60 Campbell plantwith overall dimensions is shown in fig. 8. A photograph of a150 plant is given in fig. 27. The various parts are in-dicated as follows. Gâgenerator; Aâashpan; Vâ
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