Maricopa Community Colleges  ABA176   20004-20086 
Official Course Description: MCCCD Approval: 07/22/08
ABA176 20004-20086 LEC 1.50 Credit(s) 1.50 Period(s)
Sizing Vents and Drainage Systems
Purpose of vents in plumbing systems. Sizing requirements for specific vents, fluid flow and drainage fixture units (DFU). Sizing branch lines, waste stacks and drain lines. Sizing building drains and sewers.
Prerequisites: None.
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MCCCD Official Course Competencies:
 
ABA176   20004-20086 Sizing Vents and Drainage Systems
1. Explain the need for vents in plumbing systems and the sizing requirements for special and main vents. (I)
2. Describe sizing requirements for individual vents, common vents, wet vents and combined waste and wet vent installations and battery vented systems. (II)
3. Size specific vents according to the local code. (III)
4. Describe fluid flow in branch lines and stacks in drainage systems. (IV)
5. Calculate drainage fixture units for a specific plumbing system. (V)
6. Size branch lines for the drainage of specific plumbing fixtures and groups of fixtures. (VI)
7. Size the waste stacks and drain lines for a given structure. (VII)
8. Identify the limitations for waste stacks and drain lines in a given structure. (VII)
9. Size building drains and sewers for a given structure. (VIII)
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MCCCD Official Course Outline:
 
ABA176   20004-20086 Sizing Vents and Drainage Systems
    I. Plumbing System Vents
        A. Purpose - pressure balance
        B. Sizing factors
          1. Type of fixtures
          2. Number of fixtures
          3. Length of vent pipe
        C. Special vents
        D. Main vents
      II. Sizing for Specific Vents
          A. Individual vents
            1. Single fixture
            2. 1-1/4 inch minimum diameter
          B. Common vents
            1. Two fixtures - same floor
            2. One size larger than fixture drain
          C. Wet vents
            1. Bathroom groups
            2. Total drainage fixture units
          D. Relief vents
          E. Waste and wet vents
            1. No water closets or urinals
            2. No kitchen sinks or washing machines on 2 inch
          F. Battery vents
            1. Restrictions on number of units
            2. Vent diameter restrictions
        III. Sizing Exercise
            A. Local codes
            B. Specific vents
          IV. Fluid Flow In Drainage Systems
              A. Branch lines
              B. Stacks
            V. Drainage Fixture Units (D.F.U.) Calculations
                A. Fixture type
                B. Fixture unit value as load factors
                C. Minimum trap size
                D. Special considerations
              VI. Sizing Branch Lines
                  A. Number of fixture units
                  B. Structure height
                  C. Diameter of branch pipe
                  D. Limitations
                VII. Sizing Waste Stacks and Drain Lines
                    A. Number of fixture units
                    B. Structure height
                    C. Diameter of vertical stack pipe
                    D. Limitations
                  VIII. Sizing Building Drains and Sewers
                      A. Number of fixture units
                      B. Fall in inches per foot
                      C. Diameter of drain pipe
                      D. Limitations
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