. The Locomotive . low pressure boiler does not get somuch of the forcing that the modern power boiler may be subject explosion of a low pressure boiler, however, can usually betraced, not to lack of strength of its structure, but to ignorance andcarelessness with the fitting up and the attendance. Over-pressureswill occur in them in cases in spite of the most complete advice ofthe boiler manufacturer as to how they must be connected up andregarding the best way to operate them. During the heating seasonjust passed, reports and news items reached us of a number of seriouslow pressure bo
. The Locomotive . low pressure boiler does not get somuch of the forcing that the modern power boiler may be subject explosion of a low pressure boiler, however, can usually betraced, not to lack of strength of its structure, but to ignorance andcarelessness with the fitting up and the attendance. Over-pressureswill occur in them in cases in spite of the most complete advice ofthe boiler manufacturer as to how they must be connected up andregarding the best way to operate them. During the heating seasonjust passed, reports and news items reached us of a number of seriouslow pressure boiler accidents. One case in point is the explosion ofthe boiler shown in the accompanying illustration, which, from theinformation obtainable, seems to have been due to faulty fitting upand possibly also carelessness in handling. The boiler was used witha hot water system of heating in a garage. It was not provided witha pressure — or altitude gage and the installation was also possessed 50 THE LOCOMOTIVE [April,. Exploded Heating Boiler. of the all too common fault of not having a relief valve attacheddirectly to the boiler. Our inspectors have occasion to belabor thislatter detail very frequently in inspection reports, and to our sorrowwe find in not a few instances that an unduly large amount of argu-ment is required to convince owners that a relief valve attacheddirectly to a hot water boiler is a paramount necessity for safety,irrespective of the fact that such boilers may have free communicationwith an open expansion tank. In the case of the boiler shown in the illustration, there appears tohave been good reason for believing that the absence of such a reliefvalve was responsible for the accident. When, as is supposed, duringthe very cold night preceding the accident, the connections to theexpansion tank froze up, it became possible for an enormous pressureto build up in the boiler when it was fired up in the morning. Oneman, who stood directly in front of it at the tim
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