HP Modular Cooling System manual Water quality requirements and specifications

Water quality and leveling requirements, and condensation management

In this section
Water quality requirements and specifications	64
Leveling requirements	66
Condensation management	67

Water quality requirements and specifications

Tap water might be sufficient for some closed-loop systems. Water quality in a closed-loop system encounters problems with scaling, blockage, leaks, and corrosion that are typically found in tap water containing many chemicals and minerals. Determining the acceptable water quality range is the most essential element of the system requirements. For more information, see the HP Modular Cooling System Site Preparation Guide on the HP website (http://www.hp.com).

Cooling water composition guidelines

•The closed-loop water must not contain any lime scale deposits or loose debris.

•The water should have a low level of hardness, particularly a low level of carbon hardness. However, the water should not be so soft that it attacks the materials with which it comes into contact.

•A 1-micron filter should be used to remove free floating particulates and regularly maintained.

•Salt content should be monitored because it rises over time as a result of evaporation in the systems, causing the water to become more corrosive. (Electrical conductivity increases as the concentration of dissolved substances rises.)

•Periodically some of the enriched water should be removed and new fresh water should be added to avoid the formation of Gypsiferous water, which is unsuitable for cooling purposes. Gypsiferous water has a tendency to form boiler scale, which is particularly difficult to remove.

•Cooling water should be free from iron and manganese because these minerals tend to settle in the pipes and cause blockage.

•The presence of organic impurities with algaecides and other inhibitors should be minimized to reduce the creation of sludge deposits and microbiological contamination.

Acceptable water quality range

The following are water quality ranges required for continuous quality of performance for the MCS unit:

Hydrological data		Acceptable range
pH value		7–8.5
Carbonic acid		> 3 < 8 ºdH
	Water quality and leveling requirements, and condensation management 64