. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. brought into use. Test taps are usually placed on the covers of the purifiers, and aregenerally ^th-in. cast iron, as brass corrodes very rapidly; but v/hen the purifiers are not dividedin the centre, test taps may be placed midway in the side of the purifier, so as to ascertain thepurity of the gas before passing through the last apparatus. In order to determine the magnitude of purifiers, the first consideration is the maximum dailyproduction of the works for which they are intended, and as gasworks inva
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. brought into use. Test taps are usually placed on the covers of the purifiers, and aregenerally ^th-in. cast iron, as brass corrodes very rapidly; but v/hen the purifiers are not dividedin the centre, test taps may be placed midway in the side of the purifier, so as to ascertain thepurity of the gas before passing through the last apparatus. In order to determine the magnitude of purifiers, the first consideration is the maximum dailyproduction of the works for which they are intended, and as gasworks invariably increase in GAS, MANUFACTURE OF. 683 importance, it is always advisable to make the apparatus of ample magnitude. The maximum dailymake being ascertained, the general rule in small and medium works is to allow a purifying area of1 sq. yard for each 1000 ft. of gas, 10 sq. yards of grid a ton of coal carbonized in the twenty-fourhours. This with four purifiers, three of which are always in action, gives 7§ sq. ft. of active surfacea 1000 feet maximum production. 1377. ^^^^s^^. No gasworks, even of the most limited capacity, can be properly conducted with less than twopurifiers, each of which iu very small works should be subdivided and connected, in such a mannerthat the gas in passing ascends through the purifying material iu the first compartment, anddescends through that in the other; one purifier being in action whilst the other is being chargedready for use. By the combined action of the hydraulic main, the condenser, and scrubber or washer, the wholeof the tar and ammoniacal liquor, together with a portion of the carbonic acid and sulphur com-pounds, are, or at least should be, eliminated from the gas ; but there still remains the larger portionof the two last-mentioned impurities to be removed before it is in the condition to be delivered tothe consumer. Gas can be considered commercially pure, and in the ordinary sense of the term,free from all noxious elements,
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
