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1.6 Installation Environment
This section describes matters regarding the installation environment of equipment.
- 1.6.1 Dust
- 1.6.2 Corrosive gases
- 1.6.3 Seawater (salt damage)
1.6.1 Dust
Airborne dust
Ensure that airborne dust does not exceed 0.15 mg/m
3
in computer rooms. Most computers are designed to withstand
this level of airborne dust. This is the same as the permissible level for airborne dust in a general office and should
be easily attainable in a computer room where there is little inflow of outside air containing airborne dust and
cigarette smoke.
Removing dust
Airborne dust is collected by air filters in the air conditioner. The computer room must be periodically cleaned to
remove dust on and under the floor. Cleaning is required in the following situations:
- When the construction of the computer room has just been completed, and it is ready to house equipment.
- When the computer room has been repaired.
- When equipment already in position in the computer room has been relocated.
1.6.2 Corrosive gases
Corrosive gases must be removed and kept out by using appropriate air cleaning facilities. Maintaining positive
pressure in the computer room with filtered air will serve as a safeguard against the entry of corrosive gases from
an outside source. TABLE 1.5 Tolerable limits for corrosive gases lists the tolerable limits for different kinds of
corrosive gases.
TABLE 1.5 Tolerable limits for corrosive gases
Gas name Tolerable limit
Hydrogen sulfide (H
2
S)
7.1 ppb and under
Sulfur dioxide (sulfur oxide) (SO
2
)
37 ppb and under
Hydrogen chloride (HCI) 6.6 ppb and under
Chlorine (CI
2
)
3.4 ppb and under
Hydrogen fluoride (HF) 3.6 ppb and under
Nitrogen dioxide (nitrogen oxide) (NO
2
)
52 ppb and under
Ammonia (NH
3
)
420 ppb and under
Ozone (O
3
)
5 ppb and under
Oil vapor 0.2 mg/m
3
and under
PRIMEQUEST 1000 Series Hardware Installation Manual
CHAPTER 1 Installation Information
16 C122-H004-07EN