Useful Things to Know about Steam Boilers

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American Steam Boiler Insurance Company, 1885 - Steam-boilers - 220 pages
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Page 114 - ... inspected in such manner as shall be prescribed by the Board of Supervising Inspectors and approved by the Secretary of Commerce, so as to enable the inspectors to ascertain its tensile strength, homogeneousness, toughness, and ability to withstand the effect of repeated heating and cooling...
Page 75 - ... so that a hot saturated solution deposits crystals on cooling. There are a few exceptions to this law, one of the most remarkable of which is common salt, the solubility of which is nearly the same at all temperatures; the hydrate and certain organic salts of lime, also, dissolve more freely in cold than in hot water.
Page 59 - Ib. average quality of soft coal, and that the full value of the same weight of different woods is very nearly the same — that is, a pound of hickory is worth no more for fuel than a pound of pine, assuming both to be dry. It is important that the wood be dry, as each 10 per cent, of water or moisture in wood will detract about 12 per cent, from its value as fuel.
Page 143 - ... (2.) Multiply the square of the lift by the square of the sine of the angle of inclination, multiply this product by the cosine of the angle of inclination, ami this last product by the number 3.1416.
Page 31 - The air, on entering from the ash-pit, gives out its oxygen to the glowing carbon on the fire-grate, and generates much heat in the formation of carbonic acid. This acid, necessarily at a very high temperature, passing upwards through the body of incandescent solid matter, takes up an additional portion of the carbon and becomes carbonic oxide. Thus, by the conversion of one volume of acid into two volumes of oxide, heat is absorbed and the portion of carbon taken up during conversion is lost.
Page 114 - ... or grain, represented in pounds avoirdupois — the former multiplied by four, the latter in proportion to the ratio of its area — shall be deemed the tensile strength per square inch of the plate from which the sample •was taken; and should the tensile strength ascertained by the test equal that marked on the plates from which the...
Page 89 - The other has a basis of soot and fine coal-ashes (silicate of alumina) filled with sulphur acids, and containing more or less iron, the quantity depending on the age of the deposit. The pyroligneous deposits are always occasioned by want of judgment in kindling and managing the fires. The boilers being cold, the fires are generally started with wood; pyroligneous acid then distils over into the tubes, and, collecting with the soot already there from the first kindling fires, forms the nucleus for...
Page 28 - Under one set of conditions we can obtain a compound of one atom of carbon with one atom of oxygen, whilst under other conditions we obtain a compound of one atom of carbon with two atoms of oxygen, or exactly twice as much. This is why we find such marked intervals in composition between two or more compounds of the same elements. The...
Page 89 - They are of two kinds, both of which are capable of corroding the iron rapidly, especially when the boilers are heated and in operation. The most common one consists of soot (nearly pure carbon) saturated with pyroligneous acid, and contains a large proportion of iron if the deposit is an old one, or very little of it if it has been recently formed.
Page 26 - Let us now, in the same analytical manner, examine an atom of atmospheric air, the other ingredient in combustion. Atmospheric air is composed of two atoms of nitrogen and one atom of oxygen ; each of the former being double the volume of an atom of the latter, while their relative weights are as fourteen to eight...

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