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Steam Flash Generation (bar)

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

The diagram and 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
Steam Gauge Pressure
(bar)
Flash Steam generated from Condensate (%)
Condensate Gauge Pressure (bar)
01)0.511.522.53
0 0.0
1 3.8 1.7 0.0
2 6.3 4.2 2.6 1.2 0.0
3 8.3 6.2 4.5 3.2 2.0 0.8 0.0
4 9.8 7.7 6.1 4.8 3.6 2.4 1.7
5 11.2 9.1 7.5 6.2 5.0 3.8 3.1
6 12.3 10.3 8.7 7.4 6.3 5.0 4.3
7 13.4 11.4 9.8 8.5 7.4 6.2 5.4
8 14.4 12.3 10.8 9.5 8.4 7.2 6.5
9 15.2 13.2 11.7 10.4 9.3 8.1 7.4
10 16.1 14.1 12.5 11.3 10.1 9.0 8.3
11 16.8 14.8 13.3 12.0 10.9 9.8 9.1
12 17.5 15.6 14.1 12.8 11.7 10.5 9.8
13 18.2 16.3 14.8 13.5 12.4 11.2 10.6
14 18.9 16.9 15.4 14.2 13.1 11.9 11.2
15 19.5 17.6 16.1 14.8 13.7 12.6 11.9

1) It is common to vent condensate systems to the atmosphere - where the gauge pressure is 0 bar.

• 1 bar = 105 Pa (N/m2) = 10.197 kp/m2 = 10.20 m H2O = 0.9869 atm = 14.50 psi (lbf/in2)

Example - Generated Flash Steam

A condensate system is vented to the surroundings and the pressure in the condensate system after the condensate traps is 0 bar gauge. The absolute steam pressure before the condensate trap is 10 bar gauge.

According the table above 16.1% of the condensate evaporates as flash steam after the trap.

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

If you prefer Imperial units - go here!

Related Topics

• Flash Steam

Flash steam generation - thermodynamic fundamentals, heat loss, energy recovery and more.

• Steam and Condensate

Steam & condensate systems- properties, capacities, pipe sizing, systems 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

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Flash Steam Generation - Imperial Units (psig)

When condensate passes steam traps - flash steam is generated.

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.

Hazard vs. Flash Points

The flash point of a chemical indicates how easy it may ignite and burn.

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Introduction to pressure - online pressure units converter.

Saturated Steam - Properties for Pressure in Bar

Saturated Steam Table with properties like boiling point, specific volume, density, specific enthalpy, specific heat and latent heat of vaporization.

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

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