. Principles and practice of plumbing . n 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 objection to this methodof installation is the fact that the network of pipes formingthe house drain interferes with the head room of the cellar. Materials for the House Drain.—When buried inthe earth, house drains should be c
. Principles and practice of plumbing . n 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 objection to this methodof installation is the fact that the network of pipes formingthe house drain interferes with the head room of the cellar. Materials for the House Drain.—When buried inthe earth, house drains should be constructed of cast-ironpipe. In buildings over two stories in height they shouldbe made of extra heavy cast-iron pipe; in small cottagesstandard pipe may be used. House drains located in ducts or suspended abovefloors may be of wrought pipe with special cast-iron re-cessed drainage fittings which present smooth, continuousinner surfaces to the flow of sewage, as shown in Fig. wrought pipe and cast-iron fitting, should be coated. Fig. 4 Recessed Drainage Pitting Digitized by Microsoft® Principles and Practice of Plumbing 21 with asphalt, sherardized,* or galvanized both inside andout, and the ends of all pipes that screw into iittings shouldbe reamed to remove the burr formed by cutting. Tileshould be used in the construction of a house drain only inthe cases pointed out in the paragraphs on house sewers. Connections to House Drains.—Connections tohouse drains should be made with Y fittings, as shown at ain Fig. 5. AY fitting gives the branch b an angle of forty-five degrees, and if it is to be run parallel with the maindrain or at right angles to it, the change of direction can beeffected by using a one-eighth bend, c or d. AT fittingshould never be used in any part of a drainage system which
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