WORKING SKETCH

The information provided in a floor plan is limited to what fixtures are to be installed and their locations. Diagrams that show the actual layout of plumbing systems are provided in the mechanical section of the prints. Before you send a crew to put in a system and its components, draw a working sketch translating the blueprint drawings in such a way that a crew leader can use it for the installation.

A working sketch is a drawing made to express a tasking clearly and to provide a quick reference for job requirements. It should be drawn to show actual conditions on the job, the size of piping to be installed, the locations where connections are to be made, and possibly the type of joints to be used. It should also show as much detail as possible to help the crew during installationor troubleshooting. A working sketch usually shows the work you want a crew to accomplish in a selected area. It also should provide ready reference to jobsite conditions. Figure 4-3 is the floor plan of a house; it shows a bath, heater room, and kitchen. The floor plan of a structure is located in the architectural section of a blueprint package. It shows the locations of plumbing fixtures, built-in cabinets, mechanical equipment, and so forth, that are to be installed as functional components of the completed facility.

Look at figure 4-9. This is an isometric drawing of the plumbing system that services the floor plan shown in figure 4-3. It shows every detail involved in the installation, but it is not representative of actual jobsite conditions. From the isometric drawing, you can determine planning and estimating information but not the actual locations or installation

Figure 4-9. - Isometric hot-and cold-water piping system.