1. Chapter 20
Plumbing Plans

2. Introduction Classifications of piping: Types of pipes:
Industrial or residential (i.e., plumbing)
Types of pipes:
Copper
Plastic
Metal
Steel
Cast iron

3. Introduction (cont’d.)
Residential plans
Generally don’t require complete plumbing plan
Need should be verified with local building code
In most cases, requirements can be provided on floor plan
Symbols for fixtures
Notes for specific applications or conditions

4. Plumbing Terms and Definitions
Key terminology:
Cleanout
Drain
Fitting
Hose bibb
Main
Plumbing fixture, system, and wall
Potable water
Riser
Rough-in
Run
Sanitary sewer
Sewer
Soil pipe and stack

5. Terms and Definitions (cont’d.)
Key terminology (cont’d.):
Stack
Storm sewer
Trap
Valve
Vanity
Vent pipe and stack
Waste pipe and stack
Water closet
Water distributing pipe
Water heater, main, and meter
Water service

6. Size of Plumbing Piping
Water supply plumbing is based on:
Amount of water needed
Supply pressure
Pipe length
Number of stories to be supplied
Flow pressure needed at farthest point

7. Size of Plumbing Piping (cont’d.)
Size of drainage piping is based on:
Standards established for fixture type
Average amount of waste discharged through the fixture in a given amount of time
Size of vent pipes is based on:
Number of drainage fixture units that drain into waste portion of vent stack

8. Universal Plumbing Installations
Design considerations:
Sinks
Water closet
Bathtubs
Showers

9. Plumbing Schedules
Similar to door, window, and lighting fixture schedules
Mortgage lenders may require a complete description of materials

10. Plumbing Drawings Usually not on the same sheet as complete floor plan
Only plumbing items on floor plans are fixtures
Generally drawn separately
Floor plan is used as a base drawing
May be prepared by a drafter or in conjunction with a plumbing contractor

12. Water Systems Water supply to a structure begins at a:
Water meter for public systems
Water storage tank for private well systems
Water supply to home or business:
Known as the main line
Generally 1" plastic pipe

13. Water Systems (cont’d.)
Water heaters
Placed on a platform with an overflow tray
Recommended sizes vary
Hose bibbs
Faucets used to attach a hose
Outside hose bibbs require a separate valve
Allows owner to turn off water to hose bibb during freezing weather

14. Drainage and Vent Systems
Drainage system
Provides for distribution of solid and liquid waste to sewer line
Vent system
Allows continuous airflow through the system
Gases and odors can dissipate
Bacteria do not have an opportunity to develop

16. Isometric Plumbing Drawings
Provide three-dimensional representation of a plumbing layout (i.e., plumbing riser diagram)

17. Automatic Fire Sprinkler Systems
2009 International Residential Code (IRC)
Section P2904 of the International Plumbing Code (IPC)
Requires automatic fire sprinkler systems for all new townhouse construction
Not required on additions or alterations made to existing townhomes

18. Sewage Disposal Sanitary sewer system
Underground pipes collect and transfer wastewater to treatment plants or private sewage treatment
Includes domestic, business, and industry
Not designed to handle storm water
Systems:
Public sewers
Private sewage disposal (e.g., septic tank)

19. Fire Sprinkler Systems
Commonly used in commercial buildings
Becoming a consideration in residential design
Sometimes required
Determined by local governing agency, by square footage or location
Water plug releases water when heat reaches a certain temperature
Several advantages

20. Metrics in Plumbing Pipe is made of a wide variety of materials
Identified by trade names
Nominal sizes related loosely to actual dimensions
Metric values established by International Organization for Standardization
Relate nominal pipe sizes in inches to metric equivalents (i.e., diameter nominal)

21. Adding Plumbing Information to the Floor Plan
Residential floor plan drawings plumbing symbols and notes
May be placed with all other floor plan content
Aid in reading and understanding
Notes are generally minimal
Can also be placed on a separate drawing

22. Commercial Plumbing Drawings
In most cases, are an individual component of the complete set of plans
Architect or mechanical engineer prepares plumbing drawings over base floor plan
Keeps drawing clear of unwanted information
Makes it easier for the plumbing contractor to read the print

25. Plumbing Plan Drawing Checklist
Refer to the text for a plumbing plan drawing checklist
Check off items as you work on the plumbing plan
Ensures all of necessary items are included