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9.2 Set blending (ROB plant only)
The blending armature allows for adjusting pure water quality
continously from raw water quality to permeate quality (conducti-
vity 5 to 20 µS/cm ). Blending the permeate with raw water is
achieved via the blending pipe.
Auxiliary equipment required
A collecting vessel of at least 15 liter capacity is required.
Set blending
Step
Action
1
Close inlet pipe of system to be filled.
2
Open sampling valve (have collecting vessel ready).
3
Close blending armature.
Fig. 10: Location of blending armature
4
Exhaust pressure vessel:
System must run for a period of time that will allow for at least 15 liter
of permeate drain through the sampling valve into the collecting ves-
sel.
5
Determine conductivity in permeate.
6
Set blending armature (a maximum of six full turns is possible).
7
Repeat step 5 and, if required, step 6
8
Close sampling valve and open inlet pipe to system to be filled.
