IN the improved method of showing plumbing work on plans, the old method followed in designing the superstructure of the building, is adopted. That is, general plans are prepared showing the layout and relation of the various parts, and special drawings are prepared to show details of various parts of the work. A full and complete set of drawings of a plumbing installation consists of the various floor plans from subbase-ment to roof, and one or more details showing the elevation of different lines. If the layout of two or more floors are alike, one print will suffice for these several floors, that fact being conspicuously printed on the sheet. Each floor plan should show clearly not only the rising lines of soil, waste and vent pipes, but the hot, cold and circulation risers as well, and where pipes are offset or cross under a floor that fact may be indicated by dotted lines. In preparing plumbing plans, it is not necessary to make as full and complete a set of drawings as for the general set of plans, for the plumbing plans will be interpreted in connection with the general plans and need be only an outline drawing showing the various walls and partitions, together with the location of elevator machinery, boilers, heating apparatus, refrigeration plant and other like machinery in the cellar and subbasement, so that plumbing pipes will not be placed in locations where they would interfere with the installation of other apparatus.
For cottages or other small buildings where the plumbing work is comparatively simple, the plumbing layout can be marked on the general plans without necessitating too many lines.
Wherever a number of plumbing fixtures are grouped together in a building, the various soil, waste, vent and supply pipes will cross and recross one another in various directions. If the location of the stacks, rising lines of supply pipes and fixtures is alone indicated, the work of arranging the pipes will devolve upon the workman who installs them. In complete plans, however, the arrangement, point and manner of crossing of the various pipes, the kind of fittings to use and the manner of supporting the stacks are studied out in the office, and details made showing the roughing-in of the various groups. Details of crooked stacks which require offsetting; the grouping of pump, suction tank, meters and filters in the basement; house tanks and connections on the roof; manifold connections for water supply, and all other parts of the drainage system, should be studied out in the office, the various proportions ascertained and the complete data worked up into large size details to serve as a guide in estimating on the work and installing the system.
In order to make clear the requirements in this direction a set of plumbing plans and details, from practice, is here reproduced, both as a guide to others in preparing plumbing plans, and to show, by contrast with the usual method now generally followed, how much more full complete and satisfactory is the new method here recommended, over the old method with its incomplete data and conventional elevation.