Chapter 20 Plumbing Plans

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

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

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

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

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

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

Universal Plumbing Installations Design considerations: Sinks Water closet Bathtubs Showers

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

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

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

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

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

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

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

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)

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

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)

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

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

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