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Deposits in boiler flues
Items and Novelties.
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much greater resisting power than that displayed by ordinary bronze. In Prussia it was shown, in firing with the regulation charges, and dit4inishing at each fifty shots the exterior diameter of the chamber, tllat the phosphor-bronze cannons changed their dimension only when the thickness of the metal was below that of the dimensions of a cannon of the same calibre of steel. The Belgian government has adopted the phosphor-bronze for small arms and for the harness metal of its cavalry. From the brief space of time it has been before the mechanical world, not less than from the modifications of which its physical properties are susceptible by slight variations in its constitution, it is fair to presume that the uses to which it may be advan. ~ageously applied have as yet by no means been fully recognized.
Deposits in Boiler :Flues.--Concerning the formation of doposits in boiler flues, about which a considerable amount of speculation has been published, Prof. Hayes give the following opinion in a late issue of the American Chemist : .These 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 ~ontains a large proportion of iron if the deposit be an old one, or very little iron if the deposit has been recently formed. .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 determined by the age of the deposit. .The pyroligneous deposits are always caused by want of judgment in kindling the fires. The boiler being cold, the fires are generally started with wood ; pyroligneous acid then distills over into the tubes, and collecting with the soot already there from the first kindling fires, forms the nucleus for the deposit, which soon becomes permanent and more dangerous every time wood is used in the fire-place afterwards. .The sulphur acid deposits derive their sulphur from the coals used ; but the base, holding their acid, is at first occasioned by cleaning or shaking the grates, soon after adding fresh charges of coal. Fine ashes are thus driven into the flues at the opportune moment for them to become absorbents for the sulphur compound distilling from the coals, and the corrosion ~)f the iron follows rapidly after the formation of these deposits.
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much greater resisting power than that displayed by ordinary bronze. In Prussia it was shown, in firing with the regulation charges, and dit4inishing at each fifty shots the exterior diameter of the chamber, tllat the phosphor-bronze cannons changed their dimension only when the thickness of the metal was below that of the dimensions of a cannon of the same calibre of steel. The Belgian government has adopted the phosphor-bronze for small arms and for the harness metal of its cavalry. From the brief space of time it has been before the mechanical world, not less than from the modifications of which its physical properties are susceptible by slight variations in its constitution, it is fair to presume that the uses to which it may be advan. ~ageously applied have as yet by no means been fully recognized.
Deposits in Boiler :Flues.--Concerning the formation of doposits in boiler flues, about which a considerable amount of speculation has been published, Prof. Hayes give the following opinion in a late issue of the American Chemist : .These 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 ~ontains a large proportion of iron if the deposit be an old one, or very little iron if the deposit has been recently formed. .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 determined by the age of the deposit. .The pyroligneous deposits are always caused by want of judgment in kindling the fires. The boiler being cold, the fires are generally started with wood ; pyroligneous acid then distills over into the tubes, and collecting with the soot already there from the first kindling fires, forms the nucleus for the deposit, which soon becomes permanent and more dangerous every time wood is used in the fire-place afterwards. .The sulphur acid deposits derive their sulphur from the coals used ; but the base, holding their acid, is at first occasioned by cleaning or shaking the grates, soon after adding fresh charges of coal. Fine ashes are thus driven into the flues at the opportune moment for them to become absorbents for the sulphur compound distilling from the coals, and the corrosion ~)f the iron follows rapidly after the formation of these deposits.