Heating and ventilating buildings : a manual for heating engineers and architects . and led to somepipe which will freely discharge the entrapped air. An air-vaive is not ordinarily to be recommended for suchsituations. 107. Systems of Piping.—The systems of piping ordinar-ily employed provide for either a complete or a partial circulat-ing system, each consisting of main and distributing pipes andreturns. Several systems of piping are in common use, ofwhich we may mention : First, the complete-circuit system, often called the one-pipesystem, in which the main pipe is led directly to the highe
Heating and ventilating buildings : a manual for heating engineers and architects . and led to somepipe which will freely discharge the entrapped air. An air-vaive is not ordinarily to be recommended for suchsituations. 107. Systems of Piping.—The systems of piping ordinar-ily employed provide for either a complete or a partial circulat-ing system, each consisting of main and distributing pipes andreturns. Several systems of piping are in common use, ofwhich we may mention : First, the complete-circuit system, often called the one-pipesystem, in which the main pipe is led directly to the highestpart of the building; from thence distributing-pipes are run tothe various return-risers, which in turn connect with the radiat-ing surface and discharge in the main return. The supply forthe radiating surface is all taken from the return-risers, and in VARIOUS SYSTEMS OF PIPING. 211 some cases the entire downward circulation passes through theradiating system. This system was employed by Perkins in his method of high-pressure hot-water heating, and is mentioned by P6clet as. in use in France in 1830. In this country it seems to have beenintroduced into use by J. H. Mills, and is often spoken of asthe Mills system of piping. The system is equally well adaptedfor either steam or hot-water heating, and on the score of posi-tiveness of circulation and ease of construction is no doubt to 212 HEATING AND VENTILATING BUILDINGS. be commended as superior to all others. It is principally ob-jectionable because the horizontal distribution-pipes have to berun in the top story of the building instead of the basement;which may or may not be of serious importance. p^^x^V^^^^
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