Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Sizing Water Supply Lines

Sizing water supply service and distribution lines based on Water Supply Fixture Units (WSFU)

Sponsored Links

Due to intermittent use of the fixtures in a water supply system it can be difficult to predict and size the supply and service lines. The fixtures total theoretical demand should always be compensated with a statistic more expected demand.

With the Water Supply Fixture Units (WSFU) system defined by the Uniform Plumbing Code (UPC) there are tables available where the total demand calculated by adding each units "Water Supply Fixture Units" (WFSU) are compensated to an expected demand.

The tables below can be used to size building supply and branch lines and meter and service lines.

Supply pressure 30 - 45 psi

Maximum Water Supply Fixture Units (WSFU)
Meter and street service lines
(inches)
Building supply and branch lines
(inches)
Length of pipe (feet)
406080100150200
3/4 1/2 6 5 4 3 2 1
3/4 16 16 14 12 9 6
1 29 25 23 21 17 15
1 1 36 31 27 25 20 17
1 1/4 54 47 42 38 32 28

WSFU - Water Supply Fixture Units

Supply pressure 45 - 60 psi

Maximum Water Supply Fixture Units (WSFU)
Meter and street service lines
(inches)
Building supply and branch lines
(inches)
Length of pipe (feet)
406080100150200
3/4 1/2 7 7 6 5 4 3
3/4 20 20 19 17 14 11
1 39 39 36 33 28 23
1 1 39 39 39 36 30 25
1 1/4 78 78 76 67 52 44

Supply pressure over 60 psi

Maximum Water Supply Fixture Units (WSFU)
Meter and street service lines
(inches)
Building supply and branch lines
(inches)
Length of pipe (feet)
406080100150200
3/4 1/2 7 7 7 6 5 4
3/4 20 20 20 20 17 13
1 39 39 39 39 35 30
1 1 39 39 39 39 38 32
1 1/4 78 78 78 78 74 62
  • 1 in = 25.4 mm

The tables can be used for pipe lines but for special equipment like manifolds etc. a table or formula converting the WSFU to water flow should be used for proper sizing.  

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: water supply fixture units wfsu pipe lines service
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2008). Sizing Water Supply Lines. [online] Available at: https://www.engineeringtoolbox.com/wfsu-pipe-lines-d_1075.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

5 9

Sponsored Links
.