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# 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.

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.

Flash Steam Generation from Condensate vs. Steam Pressure - SI-units
Absolute Pressure before the condensate trap
(kN/m2)
Temperature
(oC)
Percent Flash Steam of Condensate (%)
Absolute Pressure after the condensate trap (kN/m2)
400260170101.336535
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.

## Related Topics

• ### Flash Steam

Generation of flash steam in steam and condensate systems. Thermodynamic fundamentals, heat loss, energy recovery and more.
• ### Steam and Condensate

Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

## Related Documents

• ### Condensate Pipes - Flash Steam Generated

Calculate flash steam generation in condensate pipe lines.
• ### Flash Steam Energy Loss

When flash steam is generated and vented to the surroundings a considerable amount of energy is lost
• ### Flash Steam Generation - Fundamental Physics

Tutorial to the basic physics behind flash steam generation
• ### Flash Steam Generation - Imperial Units (psig)

When condensate passes steam traps - flash steam is generated.
• ### Hazard vs. Flash Points

The flash point of a chemical indicates how easy it may ignite and burn.
• ### Saturated Steam - Properties - Imperial Units

Steam table with sensible, latent and total heat, and specific volume at different gauge pressures and temperatures.
• ### Steam Flash Generation (bar)

The amount of flash steam generated depends on steam pressure and pressure in the condensate lines.
• ### Steam Trap Selection Guide

Steam trap selection guide - Float & Thermostatic, Inverted Bucket, Bimetal Thermostatic, Impulse and Thermodynamic Disc steam traps.
• ### Steam Traps - Back Pressure and Capacity

A back pressure in a condensate systems will reduce steam trap capacity
• ### Vapor and Steam

An introduction to vapor and steam.

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## Citation

• The Engineering ToolBox (2003). Flash Steam Generation - SI-units. [online] Available at: https://www.engineeringtoolbox.com/flash-steam-generation-d_104.html [Accessed Day Month Year].

Modify the access date according your visit.

6.3.17

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