HP Performance-Optimized Datacenter, 12 m (40 ft) User Guide

Water quality requirements 22
Water quality requirements
Water quality requirements and specifications
• Closed-loop water must not contain any lime scale deposits or loose debris.
• The water must have a low level of hardness, particularly a low level of carbon hardness.
Additionally, the water must not be so soft that it attacks the materials with which it comes into
contact.
• The chilled water temperature to be supplied to the HP POD is 13ºC to 24ºC (55ºF to 75ºF).
Freezing water might cause a blockage and damage to the unit. The heat transfer potential of the
water is lower, so the equipment must be derated properly.
Acceptable water quality specifications
Water must be maintained per the following acceptable water quality standards.
Parameter Range
pH 8.0–10
Specific conductance at 25ºC
(77ºF)
0–2500 µmhos/cm
Alkalinity ("M" as CaCO
3
) 150–1000 ppm
Sulfur (SO
4
) 0–150 ppm
Chloride (Cl) 0–100 ppm
Hardness (CaCO
3
) 0–350 ppm
Calcium hardness (CaCO
3
) 0–200 ppm
Magnesium hardness (CaCO
3
) 0–150 ppm
Copper (Cu) < 0.20 ppm
Iron (Fe) < 3.0 ppm
Aluminum (Al) < 0.50 ppm
Sodium (Na) 0–1000 ppm
Silica (SiO
2
) 0–150 ppm
Zinc (Zn) < 1.0 ppm
Manganese (Mn) < 0.1 ppm
Phosphate Ortho- (PO
4
) < 3 ppm
Bacteria < 1000 CFU/ml
Suspended solids < 10 ppm
If your water is out of range, consult a water quality expert.