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Verify the Site Meets Environmental Requirements
ISO 14644-1 Class 8 Environment
■
Total mass of airborne particulates must be less than or equal to 200 micrograms
■
per cubic meter
Severity level G1 per ANSI/ISA 71.04-1985
■
Particles ten microns or smaller are particularly harmful to most data processing
hardware. Gasses that are particularly dangerous to electronic components include
chlorine compounds, ammonia and its derivatives, oxides of sulfur, and petrol
hydrocarbons. In the absence of appropriate hardware exposure limits, health
exposure limits must be used.
Humidification with chlorinated water is a common source of airborne chlorine.
Appropriately-designed carbon filters must be used to ensure safe levels of airborne
chlorine when chlorinated water is used for humidification.
Table 2–1
Chemical
Acetic Acid (CH
Ammonia (NH)
Chlorine (Cl)
Hydrogen Chloride (HCl)
Hydrogen Sulfide (H
Ozone (O
Petrol-hydrocarbons (C
Sulfur Dioxide (SO
Sulfuric Acid (H
Some basic precautions to follow:
Do not allow food or drink into the data center.
■
Do not store cardboard, wood, or packing materials in the data center clean area.
■
Identify a separate area for unpacking new equipment from crates and boxes.
■
Do not allow construction or drilling in the data center without first isolating
■
sensitive equipment. Dry wall and gypsum are especially damaging to equipment.
Positive Pressurization and Ventilation - Hot Aisle Containment System (HACS)
If you will be installing the SL150 in an HACS environment, the system must maintain
adequate air flow from the cold to hot aisle. Ensure that there is no turbulent air
directed at the installed equipment which may reduce the cooling capability of the
cold aisle supply air.
The HACS pressure differential should have neutral to negative pressure in the hot
aisle. To achieve this, you may need to install rack doors on contributing or affected
racks. If this is ineffective to reduce air impediment, you may need to install a
supplemental air removal unit to boost airflow through the equipment.
2-2 StorageTek SL150 Modular Tape Library Guide
Gas Limit Recommendations
ASHRAE
COOH)
Not defined
3
3500 µg/m
2100 µg/m
Not defined
S)
50 µg/m
2
)
235 µg/m
3
H
)
Not defined
n
n
)
80 µg/m
2
SO
)
Not defined
2
4
OSHA (PEL)
ACGIH
10 ppm
Not defined
350 ppm
25 ppm
3
31 ppm (c)
Not defined
3
5 ppm (c)
Not defined
3
320 ppm (c)
10 ppm
3
30.1 ppm
Not defined
500 ppm
75 ppm
3
35 ppm
2 ppm
1 ppm
Not defined
NIOSH
Not defined
Not defined
0.5 ppm (c)
Not defined
10 ppm
Not defined
300 ppm
0.5 ppm (c)
1 ppm (c)
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