Chapter 20 Plumbing Plans Introduction Classifications of piping

Chapter 20 Plumbing Plans

Introduction • Classifications of piping: – 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 – 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 threedimensional representation of a plumbing layout (i. e. , plumbing riser diagram)

Automatic Fire Sprinkler Systems • 2009 International Residential Code (IRC) – Section P 2904 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