Humidification products Steam injection humidifiers
11
Step 4 - Select the system Select the system that will handle the known capacity (Type 20 or Type 40) to obtain the required valve Kv. See overleaf and the example below:
1
1.5 to 12
Lance model
Kv 1 Kv 2 Kv 3 Kv 4 Kv 5 Kv 5.8 Kv 7
Type 20 system with multiple lances
Supply pressure
0.25 bar g 0.5 bar g 1.0 bar g 1.5 bar g 2.0 * bar g
0 0 0 0
6
12
18
24 40 60 80
30
36 60 90
42
10
20 30 40
30 45 60
50
70
Steam load kg/h
15
75
105 140
20
100
120
110 kg/h
0
22
44
66
88
110
132
154
* Recommended maximum inlet steam pressure to separator for quiet operation of the humidifier. For operating pressures above 2 bar g consult Spirax Sarco. It will be seen that the Type 20 system for multiple lances requires a Kv value of 5.8 Step 5 - Select the control valve and separator Having selected the required valve Kv, the actual valve size and actuator can now be found from the chart headed 'Valve selection' on TI-P795-03. Always select the next highest valve Kvs, to the Kv required. Recommended control valve is a DN20 LE31 with screwed BSP connections. Recommended actuator is an AEL3E for 24 V operation VMD control signal. Final product selection and specification from the above example: 1 x Spirax Sarco S.I. humidifier for 110 kg/h at 1.5 bar g; 1 x Type 20 separator with DN20 LE31 valve screwed BSP, with AEL3E actuator for 24 V operation VMD control signal, and 3 x Type 20 model 6 lances.
8.1.5
11.1 8
TI-P795-02 CTLS Issue 6
Page 2 of 4
Type 20 and Type 40 Sizing Direct Steam Injection Humidifiers
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