File:Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918) (14592882880).jpg

Identifier: mechanicsofhouse00keen (find matches)
Title: Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances
Year: 1918 (1910s)
Authors: Keene, E. S. (Edward Spencer), b. 1864
Subjects: Heating Lighting Plumbing
Publisher: New York, McGraw-Hill book company, inc.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
r in a trap so ventedwill be open to the air from both sides and consequently can neverbe subject to siphonic action. In the average-sized dwelUng where non-siphoning trapsare used, back-venting is not necessary, but in large houses and 106 MECHANICS OF THE HOUSEHOLD in plumbing where siphon traps are used, vent pipes must be at-tached to the traps to assure a satisfactory system. Fig. 100 furnishes an example of back-venting, applied to thebathroom shown in Fig. 99. In the former figure the bath tuband wash basin are connected with the waste pipe by siphontraps. A siphon trap may lose its seal in two ways: by self-siphonage, or by aspiration caused by the discharge of the waterfrom other fixtures. In the discharge of the siphon trap, suchas B, in Fig. 100, the long leg of the siphon, formed by the dis-charge pipe, may carry away the water so completely that notenough remains in the trap to form a seal. Again, the dischargeof the water from the bath tub through the waste pipe tends to
Text Appearing After Image:
Fig. 100.—An example of back-vented plumbing as applied to the bathroom. form a vacuum above it and in some cases the seal in B is de-stroyed by the water being drawn into the vertical pipe. Thepossibility of either of these occurrences is prevented byback-venting. In Fig. 100, a pipe from the main stack is connected with thebend of the trap at B and also to the waste pipe outside the trapat T. A vent is also taken from the drain C, at a point justbelow the trap in the closet seat. The object of all of the ventsis to prevent the tendency of the formation of a vacuum from any PLUMBING 107 cause that will carry away the water seal of the trap and allowsewer gas to enter the house. The closet seat also contains a trap which will be describedlater. It connects with soil pipe /S, leading to the sewer by alarge lead pipe C, All of the pipes under the floor, leading to the soil pipe, shouldbe of lead. The pipes above the floor are generally of iron ornickel-plated brass. All of the connect

Note About Images