© 2016 SPI Lasers UK Ltd.
Commercial in Confidence
SM-S00500 Revision A 21 October 2016
redPOWER QUBE Cased Fiber Laser User Manual
Table 24 Cooling Water Requirements
Clear and without sediment
Hardness (mg CaCO3 per litre)
Electrical Conductivity At 25°C
Drinkable tap water is likely to meet these requirements, and water meeting the requirements
of VDI3803, Appendix B, Table B3 does.
When designing the water cooling system, the Laser Integrator should consider that:
deionised water is not permitted in the cooling circuit as the generally high levels of
dissolved O
2
and CO
2
in deionised water cause corrosion.
as the cooling circuit of the base plate is copper and the internal surfaces of the
PIPA-Q optical connector are nickel-plated and stainless steel, aluminium and plain
carbon or low alloy steels should not be used as galvanic corrosion may occur.
Galvanic corrosion occurs if materials with widely different electrochemical potentials
are used. Stainless steel and insulating materials (polymers) may be used.
the temperatures specified for the cooling water may sustain bacterial growth. Bacterial
growth may reduce both the flow rate and the efficiency of heat transfer as well as
being a health hazard.
hard water (water that has high mineral content) may cause scaling in the cooling
circuit reducing both the flow rate and the efficiency of heat transfer.
pre-treated water and additives for prevention of corrosion, scaling and microbial
growth are available commercially, for example from NALCO and Optishield. Additives
may reduce the heat capacity of the water. The flow rate must be increased to
compensate.
Table 25 Cooling Requirements (Connection to Manifold)
Cooling Water
Temperature
It is important that internal condensation will not
occur. Refer to Section 17.1.
At 20°C water temperature.
For QUBE Fiber Lasers having a medium case.
Refer to Table 32
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