The Locomotive . 0C0ttt0tfe PUBLISHED BY THE HARTFORD STEAM BOILER INSPECTION AND INSURANCE COMPANY. Vol. XXVI. HARTFORD, CONN., OCTOBER, 1906. No. 4. Concerning Blowoff Tanks. The blowoff pipes of steam boilers usually discharge directly into the openair; but it is not always permissible to dispose of the contents of the boilers inthis simple fashion, and in many cases special tanks to receive the discharge haveto be provided. This is especially true in cities, where the waste finds its way,ultimately, into the sewers. It is injurious to a sewer to blow the contents of. Fig. 1.—A Correct Form
The Locomotive . 0C0ttt0tfe PUBLISHED BY THE HARTFORD STEAM BOILER INSPECTION AND INSURANCE COMPANY. Vol. XXVI. HARTFORD, CONN., OCTOBER, 1906. No. 4. Concerning Blowoff Tanks. The blowoff pipes of steam boilers usually discharge directly into the openair; but it is not always permissible to dispose of the contents of the boilers inthis simple fashion, and in many cases special tanks to receive the discharge haveto be provided. This is especially true in cities, where the waste finds its way,ultimately, into the sewers. It is injurious to a sewer to blow the contents of. Fig. 1.—A Correct Form of Blowoff Tank. 98 THE LOCOMOTIVE. [October, a boiler into it directly, and many cities have ordinances requiring that an in-termediate receptacle of some sort shall be provided, in order that the sewermay be protected from the destructive action of the direct discharge. It isobjectionable, also, to fill the sewer with hot steam; and when tanks are pro-vided they should be so constructed that they will permit the steam and waterto separate, the steam being allowed to escape into the air through a ventpipe at some point where it will not constitute a nuisance, while the water iseither permitted to flow from the tank into the sewer under the combinedinfluence of gravity and such pressure as may exist within the tank, or pumpedout of the tank when the conditions are such that the assistance of a pump isrequired. When blowoff tanks are employed, it is exceedingly important that theyshould be made strong enough to withstand a considerable pressure. Too oftenthey a
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