Huawei OceanStor 2600 V3 - Page 147

Symbol Sources
C Incomplete combustion (aerosol constituent), foundry
CO Combustion, automobile emissions, microbiological
activities, tree rot
Cl
2
, ClO
2
Chlorine manufacture, aluminum manufacture, zinc
manufacture, refuse decomposition
HCl Automobile emissions, combustion, forest fire, oceanic
processes, polymer combustion
HBr, HI Automobile emissions
O
3
Atmospheric photochemical processes mainly involving
nitrogen oxides and oxygenated hydrocarbons
C
N
H
N
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:
l Copper corrosion rate
Less than 300 Å/month per ANSI/ISA-71.04-1985 severity level G1.
l 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.
OceanStor 2600 V3
Product Description
7 Environmental Requirements
Issue 09 (2019-05-15) Copyright © Huawei Technologies Co., Ltd. 139