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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.
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