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

Flash Steam Generation - SI-units

When condensate leaves the steam traps - flash steam is generated. Amount of flash steam generated at different pressures - kN/m2.

Sponsored Links

The amount of flash steam generated depend on the steam pressure - the pressure in the condensate before it leaves the condensate trap - and the condensate pressure after the trap - the pressure in the condensate return pipe lines.

The table below indicates the ratio of flash steam generated at different pressures before and after the condensate trap.

Percent Flash Steam of Condensate (%)
Absolute Pressure before the condensate trap
Absolute Pressure after the condensate trap (kN/m2)
1500 198.3 11.3 14.0 16.4 18.9 20.4 23.2
1150 186.0 8.7 11.5 13.9 16.5 18.4 20.9
800 170.4 5.5 8.2 10.8 13.4 15.4 17.9
650 162.4 3.7 6.5 9.1 11.8 13.7 16.3
500 151.8 1.6 4.6 7.1 9.8 11.8 14.4
400 143.6 3.0 5.5 8.3 10.3 12.9
260 128.7 2.6 5.4 7.5 10.2
170 115.2 2.8 5.0 7.7
101.33 100 2.2 4.9

Example - Generated Flash Steam

A condensate system is vented to the surroundings and the pressure in the condensate system after the condensate traps is 101.33 kN/m2. The absolute steam pressure before the condensate trap is 1150 kN/m2.

According the table above 16.5% of the condensate will evaporate as flash steam after the trap.

Note! Without any flash recovery system the energy in the flash steam will be lost to the surroundings.

Sponsored Links

Related Topics

Related Documents

Sponsored Links

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!

About the Engineering ToolBox!


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.


This page can be cited as

  • Engineering ToolBox, (2003). Flash Steam Generation - SI-units. [online] Available at: [Accessed Day Mo. Year].

Modify access date.

. .


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

3 30

Sponsored Links