. Principles and practice of plumbing . era length of pipe should beremoved at the proper loca-tion and a Y branch sub-stituted. A hole shouldnever be cut in a tile streetsewer for the house sewerFig. 3 to be connected into. Back water Trap jj^^^g^ sewers discharg- ing into tide water should enter below the low water level,and a vent should be placed in the sewer above the highwater level to prevent tide water from air locking thesewer. When a plumbing system that drains into tidewater is at so low a level that high tide will overflow someof the fixtures or fill the house sewer, a tide water t
. Principles and practice of plumbing . era length of pipe should beremoved at the proper loca-tion and a Y branch sub-stituted. A hole shouldnever be cut in a tile streetsewer for the house sewerFig. 3 to be connected into. Back water Trap jj^^^g^ sewers discharg- ing into tide water should enter below the low water level,and a vent should be placed in the sewer above the highwater level to prevent tide water from air locking thesewer. When a plumbing system that drains into tidewater is at so low a level that high tide will overflow someof the fixtures or fill the house sewer, a tide water trap,Fig. 3 should be placed on the end of the sewer to preventtide water entering the pipe. The usual practice is to make the house sewer one ortwo sizes larger than the house drain. A better practice,however, is to continue the house sewer the same size asthe house drain. By so doing, a uniform velocity of flowis secured in both, and, when the house drain is rightly pro-portioned, a scouring action is assured. Digitized by Microsoft®. 20 Principles and Practice of Plumbing CHAPTER IIIHOUSE DRAIN Definition of a House Drain.—A house drain is thesystem of horizontal piping inside of the cellar or basementof a building, that extends to and connects with the housesewer. It receives the discharge of sewage from all soiland waste lines, and sometimes rain water from rain lead-ers, yard, cellar, area and sub-soil drains. House drains are generally located below the cellar orbasement floor, where they are entirely out of the properly installed with suitable materialsand with clean-out plugs extending flush with thefloor, there is no objection to this method of in-stallation. In some buildingswhere the house drain is to belocated below the floor, brickducts with removable covers ofiron or stone are provided to en-case it. In buildings where the base-ment floor is below the level of the street sewer,the house drain is of necessity located above thecellar floor. The only obje
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