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Choosing materials for a venting system is not usually much problem. Most jobs use Schedule-40 plastic pipe for vent pipes. There are, however, other options for vent materials. And, not all codes allow the same types of vent ma­terials. You will also notice from the following tables of approved materials that there can be a […]

Riser diagrams are often required by code officers prior to any plumbing be­ing installed. Supplying a detailed riser diagram (Fig. 5.44 and Fig. 5.45) is usu­ally a standard part of a permit applica­tion. You can also use riser diagrams to help you when sizing a vent system. If FIGURE 5.45 ■ DWV riser diagram, with […]

Supporting a vent system is another element of a system design. The spac­ing allowed for support varies from code to code and with the type of pipe being used in the vent system. The tables below will show you some examples of recommended minimums for support spacing. FIGURE 5.38 ■ Horizontal pipe-support intervals in Zone […]

Sump vents, the ones used to vent a sump system, are calculated on a basis of a pump’s discharge capacity. Tables are often provided for this type of sizing. See Figure 5.37 for an example of such a table. Using a table like this one, you can quickly and easily size a vent for a […]

Wet venting is popular, but a little different when it comes to sizing the vents. Tables can still be used for this type of sizing. Look at Figure 5.34 for an ex­ample of a table that might be used to size a wet stack vent. Another type of table that you might encounter is shown […]

Stack vents, vent stacks, and relief vents require more information for sizing. Specifically, you must know the fixture-unit load on a drain before you can determine vent sizing and developed lengths. Once you have calculated the fixture units, a sizing table can be used to give you your sizing information. The table shown in Figure […]

Sizing tables are often used when sizing vent pipes (Fig. 5.21). There can be many different types of tables to use during a sizing procedure. For example, lVa ’Л lVi Unlimited lVi V4 1V2 Unlimited 2 Vi 1 Vi 290 2 Vi lVi Unlimited 3 Vi 1V2 97 3 Vi 2 420 3 Vi 3 […]

The distance from a trap to a vent is determined by local plumbing code re­quirements. Allowable distances are usually given either in text or in tables within a codebook. There can be a sig­nificant difference from one code to the other. To illustrate this, I’d like you to refer to Figures 5.18, 5.19, and 5.20. […]

Types of vents are numerous. Do you know what an island vent is? How much do you know about relief vents? Depending upon your level of knowledge in the plumbing trade, you might be aware of all types of vents, but not all read­ers are. Before we jump into sizing examples, I’d like to make […]