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Installation Guide

OceanStor 5000, 5000F, 6000, and 6000F V5 Series V500R007

This document is applicable to OceanStor 5110 V5, 5110F V5, 5300 V5, 5300F V5, 5500 V5, 5500F V5, 5600 V5, 5600F V5, 5800 V5, 5800F V5, 6800 V5, and 6800F V5 storage systems. It describes hardware installation of those storage systems for helping you easily and quickly finish the installation.
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Corrosive Airborne Contaminants

Corrosive Airborne Contaminants

Corrosive airborne contaminants and other negative environmental factors (such as abnormal temperature and humidity) may expose IT equipment to higher risks of corrosive failure. This section specifies the limitation on corrosive airborne contaminants with an aim of avoiding such risks.

Table 4-10 lists common corrosive airborne contaminants and their sources.

Table 4-10 Common corrosive airborne contaminants and their sources




Geothermal emissions, microbiological activities, fossil fuel processing, wood rot, and sewage treatment

SO2 and SO3

Coal combustion, petroleum products, automobile emissions, ore smelting, and sulfuric acid manufacture


Foundries, sulfur manufacture, and volcanoes


Fertilizer manufacture, aluminum manufacture, ceramics manufacture, steel manufacture, and electronics device manufacture


Automobile emissions, fossil fuel combustion, and chemical industry


Microbiological activities, sewage, fertilizer manufacture, geothermal emissions, and refrigeration equipment


Incomplete combustion (aerosol constituent) and foundry


Combustion, automobile emissions, microbiological activities, and tree rot

Cl2 and ClO2

Chlorine manufacture, aluminum manufacture, zinc manufacture, and refuse decomposition


Automobile emissions, combustion, forest fire, oceanic processes, and polymer combustion

HBr and HI

Automobile emissions


Atmospheric photochemical processes mainly involving nitrogen oxides and oxygenated hydrocarbons


Automobile emissions, animal waste, sewage, and tree rot

The concentration level of corrosive airborne contaminants in a data center should meet the requirements listed in the white paper entitled Gaseous and Particulate Contamination Guidelines for Data Centers published in 2011 by ASHRAE TC 9.9.

According to the guidelines, corrosive airborne contaminants in a data center should meet the following requirements:

  • Copper corrosion rate

    Less than 300 Å/month as per ANSI/ISA-71.04-1985 severity level G1.

  • Silver corrosion rate

    Less than 200 Å/month.


Å, or angstrom, is a unit of length. One Å is equal to 1/10,000,000,000 meter.

According to ANSI/ISA-71.04-1985 Environmental Conditions for Process Measurement and Control Systems: Airborne Contaminants, the gaseous corrosivity levels are G1 (mild), G2 (moderate), G3 (harsh), and GX (severe), as described in Table 4-11.

Table 4-11 Gaseous corrosivity levels per ANSI/ISA-71.04-1985

Severity Level

Copper Reactivity Level


G1 (mild)

300 Å/month

An environment sufficiently well controlled so that corrosion is not a factor in determining equipment reliability.

G2 (moderate)

300 Å/month to 1000 Å/month

An environment in which the effects of corrosion are measurable and may be a factor in determining equipment reliability.

G3 (harsh)

1000 Å/month to 2000 Å/month

An environment in which there is high probability that corrosion will occur.

GX (severe)

> 2000 Å/month

An environment in which only specially designed and packaged equipment would be expected to survive.

Table 4-12 lists concentration limits of corrosive airborne contaminants, which help meet the requirements on the copper and silver corrosion rates.

Table 4-12 Concentration limits of corrosive airborne contaminants in a data center





Group A



< 3



< 10



< 1



< 50

Group B



< 1



< 500



< 2

a: Part per billion (ppb) is the number of units of mass of a contaminant per billion units of total mass.

Group A and group B are common gas groups in a data center. The concentration limits of group A or group B that correspond to copper reactivity level G1 are calculated based on the premise that relative humidity in the data center is lower than 50% and that the gases in the group interact with each other. A 10% increase in the relative humidity increases the gaseous corrosivity level by 1.

Corrosion is not determined by a single factor, but by comprehensive environmental factors such as temperature, relative humidity, corrosive airborne contaminants, and ventilation. Any of the environmental factors may affect the gaseous corrosivity level. Therefore, the concentration limits specified in the previous table are for reference only.

Updated: 2019-07-11

Document ID: EDOC1000181531

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