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Riser drawings are used when figuring out drainage systems, just as they are used with vent systems. I want to give you some sample riser diagrams to look over. The drawings will show you what your drawings might look like. Drains are drawn with solid lines, while vents are indicated by broken lines. FIGURE 4.26 […]

As you are drawing your riser diagrams, you should keep in mind the fittings that will be used for changes in direction. There are three ways to change di­rection. Your pipe can go from horizontal to vertical, from vertical to hori­zontal, or from horizontal to horizontal. The fittings used in a drainage sys­tem to make […]

Sizing tall stacks will require you to use different sizing tables. A tall stack is one that has more than three branch intervals. Figure 4.19 and Figure 4.20 will show you the basics needed to size tall stacks for two different codes. There are differences in the number of fixture units allowed between the two […]

Let’s talk about how you can size a horizontal branch. Bet you can guess that we are going to use a sizing table. Hey, they’re easy, fast, and accu­rate, so why not use them? Look at Figure 4.16. This table shows you the maximum number of fixture units that may be placed on a single […]

Fixture-unit tables are often used when sizing drains and sewers. The table in Figure 4.1 is an example of a table that expresses the maximum number of fix­ture units allowed on pipes of various sizes and with various amounts of fall. Before we go on, look at the category for 3-inch pipe, at a V4-inch […]

D oing calculations for drains and sewers is similar, in principle, to what you will use for vents in the next chapter. The process involves fixture units, the developed length of piping, sizing tables, and so forth. Pay­ing attention to details is an important element in designing any type of sys­tem, and this certainly holds […]

The Standard Plumbing Code provides a sizing example in their codebook. The Standard Plumbing Code, the BOCA code, and the International Plumb­ing Code have joined together and your local code office may have any vari­ation of these three codes in effect, so check your local codes carefully. A fac­tory is the building chosen for their […]

Sizing with data from the Uniform Plumbing Code is not too difficult. Allow me to give you some illustrations that are direct excerpts from the Uniform Plumbing Code. Look at the illustrations and try working through the sizing example that is provided (Fig. 3.1 through Fig. 3.17). APPENDIX A   Because of the variable conditions […]

  When you are dealing with large buildings, there will usually be detailed riser diagrams, blueprints, and specifications available to outline your work. House plans rarely show much more than fixture placement for plumbing. They frequently have wiring diagrams, but most don’t show a piping schematic. Long story short, commercial build­ings are usually laid out […]