This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...should be noticed. On account of the expense attending their use it is too often recommended not to blow out the water from the boiler for a length of time, during which the boiler is working, in order to get the utmost benefit from the ingredients. The effect of this is to thicken the water to such a degree by the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...should be noticed. On account of the expense attending their use it is too often recommended not to blow out the water from the boiler for a length of time, during which the boiler is working, in order to get the utmost benefit from the ingredients. The effect of this is to thicken the water to such a degree by the concentration of solid matters as to endanger the safety of the boiler from overheating. It frequently happens that there is a choice of two waters for feeding the boiler; the one a spring or brook, containing ingredients that form a hard incrustation, the other a surface water containing peatly or other acid substances, which act injuriously on the plates, but at the same time dissolve the calcareous matters deposited by the first. In such cases it ia found of great advantage to play one water off against the other, the hard water being used first to protect the plates, and the other afterwards to remove the incrustation formed. The use of chemical substances for preventing and removing Bcale by rendering it soluble is most required in boilers inaccessible for hand cleaning, or for the solution of large fragments of scale that have been loosened or detached by agents that act mechanically; and as such boilers cannot be well examined internally, the greater care is necessary not to introduce anything into them that is liable to injure the plates. 3. The substances used to act mechanically in preventing and removing incrustation by decreasing the cohesion and adhesion of the deposited particles, are even more numerous than those employed to act chemically in decomposing and dissolving the solid matters. In fact it is difficult to mention any common commodity that has not been employed to prevent incrustation in one way or the other, although the m...
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