. The Locomotive . ted, at the plant, and from the informa-tion obtained by talking with the attendant, it was found that theprobable cause of the explosion was that the boiler, which exploded,and which had been idle most of the winter, was started up withoutopening up the stop valve in the supply pipe to the heating stop valves in the return pipes, however, were open. Had thelatter valves been closed a very violent accident undoubtedly wouldhave taken place. It can be seen that when operating a boiler withvalves arranged as stated, a steam pocket was formed in the rearsection, whic
. The Locomotive . ted, at the plant, and from the informa-tion obtained by talking with the attendant, it was found that theprobable cause of the explosion was that the boiler, which exploded,and which had been idle most of the winter, was started up withoutopening up the stop valve in the supply pipe to the heating stop valves in the return pipes, however, were open. Had thelatter valves been closed a very violent accident undoubtedly wouldhave taken place. It can be seen that when operating a boiler withvalves arranged as stated, a steam pocket was formed in the rearsection, which brought about unequal expansion of the metal inthis section. This, together with the fact that some parts of thesection were below standard thickness weakened this section toa point where it was incapable of sustaining the pressure to whichit was subjected. After which, of course, the liberation of theheated water furnished a source of energy to complete the destruc-tion of the section. 212 THE LOCOMOTIVE. [July,. C. C. Perry, Editor. HARTFORD, JULY, 1919- Single copies can be obtained free by calling at any of the companys agencies. Subscription price SU cents per year -when mailed frotn this office. Recent bound volumes one dollar each. Earlier ones two dollars. Reprinting matter from this paper is perfnitted if credited to The Locomotive of the Hartford Steam Boiler I. & I. Co. Eng-ine Insurance. The breakdown of engines used for industrial power produc-tion has been for some years past an object of underwriting inother countries which has especially appealed to the owners ofsuch apparatus. In England, particularly, engine insurance hasbeen written in large volume and has been regarded an essentialprotection by manufacturers almost to the same degree as boilerinsurance. As practiced there, it indemnifies for the accidentalbreakage of any of the important parts of an engine and thus re-lieves the assured of the loss of, or the expense of repairing anengine which has been to
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