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Product Description 15

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R003

This document introduces the storage system from the aspects of the market position, features, architecture, technical specifications, production configuration, environment requirement, standard compliance, and granted certifications.
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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 article specifies the limitation on corrosive airborne contaminants with an aim at avoiding such risks.

Table 7-4 lists common corrosive airborne contaminants and their sources.

Table 7-4  Common corrosive airborne contaminants and their sources

Symbol

Sources

H2S

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

SO2, SO3

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

S

Foundries, sulfur manufacture, volcanoes

HF

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

NOX

Automobile emissions, fossil fuel combustion, chemical industry

NH3

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

C

Incomplete combustion (aerosol constituent), foundry

CO

Combustion, automobile emissions, microbiological activities, tree rot

Cl2, ClO2

Chlorine manufacture, aluminum manufacture, zinc manufacture, refuse decomposition

HCl

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

HBr, HI

Automobile emissions

O3

Atmospheric photochemical processes mainly involving nitrogen oxides and oxygenated hydrocarbons

CNHN

Automobile emissions, animal waste, sewage, 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 the American Society of Heating Refrigerating and Air-conditioning Engineers (ASHRAE) Technical Committee (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 per ANSI/ISA-71.04-1985 severity level G1.

  • Silver corrosion rate

    Less than 200 Å/month.

NOTE:

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 7-5.
Table 7-5  Gaseous corrosivity levels per ANSI/ISA-71.04-1985

Severity Level

Copper Reactivity Level

Description

G1 (mild)

300 Å/month

An environment sufficiently well-controlled such 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.

See Table 7-6 for the copper and silver corrosion rate requirements.
Table 7-6  Concentration limitation of corrosive airborne contaminants in a data center

Group

Gas

Unit

Concentration

Group A

H2S

ppba

< 3

SO2

ppb

< 10

Cl2

ppb

< 1

NO2

ppb

< 50

Group B

HF

ppb

< 1

NH3

ppb

< 500

O3

ppb

< 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% of increase in the relative humidity will heighten 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 limitation values specified in the previous table are for reference only.

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Updated: 2019-02-01

Document ID: EDOC1000084184

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