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Particulate contamination
Attention: Airborne particulates (including metal flakes or particles) and reactive
gases acting alone or in combination with other environmental factors such as
humidity or temperature might pose a risk to the storage enclosure that is
described in this document. Risks that are posed by the presence of excessive
particulate levels or concentrations of harmful gases include damage that might
cause the storage enclosure to malfunction or cease functioning altogether. This
specification sets forth limits for particulates and gases that are intended to avoid
such damage. The limits must not be viewed or used as definitive limits, because
numerous other factors, such as temperature or moisture content of the air, can
influence the impact of particulates or environmental corrosives and gaseous
contaminant transfer. In the absence of specific limits that are set forth in this
document, you must implement practices that maintain particulate and gas levels
that are consistent with the protection of human health and safety. If IBM
determines that the levels of particulates or gases in your environment have
caused damage to the storage enclosure, IBM may condition provision of repair or
replacement of storage enclosure or parts on implementation of appropriate
remedial measures to mitigate such environmental contamination. Implementation
of such remedial measures is a customer responsibility.
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Table 11. Limits for particulates and gases
Contaminant
Limits
Particulate
v The room air must be continuously filtered with 40% atmospheric
dust spot efficiency (MERV 9) according to ASHRAE Standard 52.2
v Air that enters a data center must be filtered to 99.97% efficiency or
greater, using high-efficiency particulate air (HEPA) filters that meet
MIL-STD-282.
v The deliquescent relative humidity of the particulate contamination
must be more than 60%
v The room must be free of conductive contamination such as zinc
whiskers.
Gaseous
v Copper: Class G1 as per ANSI/ISA 71.04-1985
v Silver: Corrosion rate of less than 300 Å in 30 days
1
ASHRAE 52.2-2008 - Method of Testing General Ventilation Air-Cleaning Devices for Removal
Efficiency by Particle Size. Atlanta: American Society of Heating, Refrigerating and
Air-Conditioning Engineers, Inc.
2
The deliquescent relative humidity of particulate contamination is the relative humidity at
which the dust absorbs enough water to become wet and promote ionic conduction.
3
ANSI/ISA-71.04-1985. Environmental conditions for process measurement and control systems:
Airborne contaminants. Instrument Society of America, Research Triangle Park, North
Carolina, U.S.A.
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Notices
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