Identifier: notesonheatingve01alle (find matches)
Title: Notes on heating and ventilation
Year: 1906 (1900s)
Authors: Allen, John Robins, 1869-1920
Subjects: Heating Ventilation
Publisher: Chicago, Domestic engineering
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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lation perature of the water. In the open tank systemthis tank is situated at the highest point of thesystem. In the closed tank system it may be lo-cated anywhere in the building. TABLE XXII.Proportion of Cast Iron Hot Water Boilers. c O T3 b4 a> ■*- C -*-> oj !2 a .2 5 T3 to 0« <j •11 3 — p3 VI- -J- C7 o <u o E C/3 C/) (/) . 300 25 1 2 8 400 30 1.3 2 8 500 40 1.6 2V2 9 750 60 2.5 2V2 9 1,000 80 3.3 3 9 1500 120 5.0 SV2 10 2.000 160 6.5 4 H 2 500 200 8.5 5or2-3y2 12 3 000 250 10.0 6 or 2-4 14 SSOO 280 11.5 6 or 2-4 16 4 000 330 13.5 6 or 2-5 18 5*000 400 16.5 7 or 2-5 26 6000 500 20 8 or 2-6 22 T^OOO 575 23 8 or 2-6 24 8 000 650 26.5 2-7 or 3-5 26 9000 750 30 2-7 or 3-5 26 lOoOO 800 33.5 2-8 or 2-6 28 IIOOO 900 36.5 2-8 or 2-6 28 Pitch.—The pitch of the pipe refers to its in-clination from the horizontal. Legs of the System.—The flow main is oftentermed the hot leg of the system and the returnmain the cold leg of the system. Notes on Heating and Ventilation 1^9
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Figure 47. 160 Notes on Heating and Ventilation Four systems of piping areSystems of Piping, used—the multiple circuit system, the single circuit sys-tem, the overhead system, and the single pipe sys-tem. Multiple Circuit System.—This system is theone most used and is sometimes called the standardsystem of piping. This system is shown in Fig. 47.The flow main rises from the top of the boiler toa convenient height just below the basement ceil-ing so as to allow for pitch towards the boiler ofnot less than ^ an inch in 10 feet. This main ormains is carried around the basement so as to sup-ply the risers. Too many risers should not betaken from one set of mains, as the radiators atthe end will be too much cooled. The main re-turn is parallel to the flow^ main and of thesame size. The open expansion tank is placedat least 3 feet above the last radiator andshould be connected to the nearest riser. Theconnection to the expansion tank should be at thebottom of the tank. In this system th

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