Boiler house Heat recovery systems
2
Trap pressure
Flash pressure % Flash
Condensate load
Mass flash
=
16.6%
20 bar g
2 bar g
1000 kg / h
166 kg / h
X
Total flash steam
=
10.1%
620 kg / h
10 bar g
2000 kg / h
2 bar g
X
202 kg / h
=
6 bar g
252 kg / h
6.3%
4000 kg / h
2 bar g
X
Velocity factor
* Velocity
Choose on < 3 m / s
= = = = =
67 138 243 385 560
5.6 m/s 2.7 m/s 1.6 m/s 1.0 m/s 0.7 m/s
FV6 FV8
Total flash steam
LP factor
Total volume
÷
FV12 FV15 FV18
620 kg / h X
=
374 m3 / h
0.603
2.8 19
* Note: Size on a take-off velocity of 3 m /s or less.
AI-P404-12 AB Issue 3
Page 3 of 5
Sizing A Flash Vessel On Up To Three Trap Pressures
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