Particulate Contamination; Documentation Format; Limits For Particulates And Gases - IBM DS3500 Installation, User's, And Maintenance Manual

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
device 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 device 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 device, IBM may condition provision of repair or
replacement of devices or parts on implementation of appropriate remedial measures to mitigate such
environmental contamination. Implementation of such remedial measures is a customer responsibility.
Table C-1. Limits for particulates and gases
Contaminant Limits
Particulate
v The room air must be continuously filtered with 40% atmospheric dust spot efficiency
v Air that enters a data center must be filtered to 99.97% efficiency or greater, using
v The deliquescent relative humidity of the particulate contamination must be more than
v The room must be free of conductive contamination such as zinc whiskers.
Gaseous
v Copper: Class G1 as per ANSI/ISA 71.04-19853
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.

Documentation format

The publications for this product are in Adobe Portable Document Format (PDF) and should be
compliant with accessibility standards. If you experience difficulties when you use the PDF files and want
to request a web-based format or accessible PDF document for a publication, direct your mail to the
following address:
Information Development
IBM Corporation
205/A015
3039 E. Cornwallis Road
P.O. Box 12195
Research Triangle Park, North Carolina 27709-2195
U.S.A.
In the request, be sure to include the publication part number and title.
(MERV 9) according to ASHRAE Standard 52.21.
high-efficiency particulate air (HEPA) filters that meet MIL-STD-282.
60%2.
C-3
Notices