. The Locomotive. s. This caused thenon-return valve to reopen and let some of the water pass into the steamline. It was probably before very much had passed that the blow-offvalve was opened. When the pressure within the boiler dropped, thenon-return valve closed, and the water, in attempting to return, set upa water-hammer which broke the valve. Automatic appliances are excellent things and usually operateproperly, but implicit confidence should not be placed in them. Inthis case the average is 50-50,— the non-return valve did operateproperly, much to its own grief, but the feed water regula
. The Locomotive. s. This caused thenon-return valve to reopen and let some of the water pass into the steamline. It was probably before very much had passed that the blow-offvalve was opened. When the pressure within the boiler dropped, thenon-return valve closed, and the water, in attempting to return, set upa water-hammer which broke the valve. Automatic appliances are excellent things and usually operateproperly, but implicit confidence should not be placed in them. Inthis case the average is 50-50,— the non-return valve did operateproperly, much to its own grief, but the feed water regulator did timely arrival of the attendant very likely averted a more seriousaccident such as would have resulted if the water had gone over to theengines and turbines. In taking a boiler out of service, wait until the non-return valvecloses automatically and then close it by hand, after which close thesecond valve, or the one on the header line, opening the drains betweenthem. 148 THE LOCOMOTIVE. [January,. Devoted to Power Plant Protection Published Ouariebly Benj. C. Cruickshanks, Editor. HARTFORD, JANUARY, 1925. Single COPIES can be obtahied free by calling at any of the companys agencies. Subscription price 50 cents per year -when mailed from this office. Recent bound volumes one dollar each. Earlier ones two dollars. Reprinting matter from this paper is permitted if credited to The Locomotive of the Hartford Steam Boiler I. & I. Co. THE increasingly wide use of the reinforced tube ligament in theconstruction of steam boilers has stimulated an interest in themanner of computing the efficiencies of such constructions. Verylittle has been published to date on this subject, although the closelyallied but much older subject of the efficiences of riveted joints hasbeen extensively treated. The article on page 131 is therefore presenting this subject each mode of failure has been analyzed,the proper formula substituted in each case, the proper substitutionsmade
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