IBM Z10 BUISNESS CLASS Z10 BC, Руководство по установке

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Table 1. Contaminant Descriptions
Contaminant Description
Gaseous contamination Severity level G1 as per ANSI/ISA 71.04-1985
1
which states that
the reactivity rate of copper coupons shall be less than 300
Angstroms per month (Å/month,
≈
0.0039 µg/cm
2
-hour weight
gain).
2
In addition, the reactivity rate of silver coupons shall be
less than 300 Å/month (
≈
0.0035 µg/cm
2
-hour weight gain).
3
The
reactive monitoring of gaseous corrosivity should be conducted
approximately 2 inches (5 cm) in front of the rack on the air inlet
side at one-quarter and three-quarter frame height off the floor or
where the air velocity is much higher.
Particulate contamination Data centers must meet the cleanliness level of ISO 14644-1
class 8. For data centers without airside economizer, the ISO
14644-1 class 8 cleanliness may be met simply by the choice of
the following filtration:
v
The room air may be continuously filtered with MERV 8 filters.
Air entering a data center may be filtered with MERV 11 or
preferably MERV 13 filters.
v
For data centers with airside economizers, the choice of filters
to achieve ISO class 8 cleanliness depends on the specific
conditions present at that data center.
The deliquescent relative humidity of the particulate
contamination should be more than 60% RH.
4
Data centers must be free of zinc whiskers.
5
Notes:
1. ANSI/ISA-71.04.1985. “Environmental conditions for process measurement and
control systems: Airborne contaminants.” Instrument Society of America,
Research Triangle Park, NC, 1985.
2. The derivation of the equivalence between the rate of copper corrosion product
thickness growth in Å/month and the rate of weight gain assumes that Cu
2
S and
Cu
2
O grow in equal proportions.
3. The derivation of the equivalence between the rate of silver corrosion product
thickness growth in Å/month and the rate of weight gain assumes that Ag
2
S is
the only corrosion product.
4. The deliquescent relative humidity of particulate contamination is the relative
humidity at which the dust absorbs enough water to become wet and promote
corrosion and/or ion migration.
5. Surface debris is randomly collected from 10 areas of the data center on a
1.5-cm diameter disk of sticky electrically conductive tape on a metal stub. If
examination of the sticky tape in a scanning electron microscope reveals no
zinc whiskers, the data center is considered free of zinc whiskers.
6. If there is any question about potential corrosive gases or level of particulates,
contact your IBM representative for assistance in monitoring the environment.
Beyond the specific information provided in this document, IBM recommends that
the customer's facility meet the general guidelines published in the
American
Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE)
Handbook .
Level 03c, May 2011
14
z10 BC IMPP
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