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R911370699 | PS6000/PRC7000 with water cooling
6.1
Inhibitors, biocide
6.1.1
Inhibitor
Inhibitors are recommended, if the water quality differ from the values defined in
Tab.4: Coolant definition.
Corrosion inhibitors serve as active corrosion protection by means of which a
corrosive attack of the cooling water on the material - especially on low-alloy
steels - can be reduced. Inhibitors build more or less resistant protective layers or
actively stop the corrosion process by interfering in the corresponding reaction
(Source: VGB Directive R455).
6.1.2
Biocide
Closed cooling circuits with soft water are vulnerable to the increase of microbes.
In chlorinated drinking water systems, the risk of corrosion caused by microbes is
as far as possible excluded.
In practice, the following microbes have to be expected:
slime-forming bacteria
corrosive bacteria
iron depositing bacteria
A suitable biocide is dependent on the type of microbes. At least one water
analysis (to determine the number of colonies) per year is recommended.
The most commonly used biocides are chlorine gas, sodium hypochlorite and
chlorine dioxide (Source: Directive VGB R455).
Notice:
The type of bacteria determines the biocide.
The dosage and compatibility with a possibly used inhibitor must be adapted
according to the manufacturer's recommendation.
7
Materials
A variety of materials and components which may be present in a cooling circuit
or which are prohibited are listed in the table below. The devices PS6000 / PRC
7000 and PSG welding transformers have cooling circuits made of copper.
Materials and components of a cooling circuit for PS6000 / PRC7000
Tab. 6:
Material
Used as
Zinc
Line, fixture
Brass
Line, fixture
Copper
Line, fixture
Bosch Rexroth AG
31/35
Materials
Use for PS6000 / PRC7000
Do not use!
Can be used in closed circuits with
inhibitor.
Can only be used in closed circuits
with inhibitor, with separation point
(e.g. connecting tube of the
devices) between heat sink and
Cu component.
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