VESDA VLP - Page 56

VESDA Maintenance Guide VESDA
Environment
Class
Typical Application Background Smoke
Level
Recommended Filter
Replacement
Frequency
Recommended
Maintenance Period
Factors that may affect filter
replacement frequency.
Recommendations of use
4 Partially enclosed, no air-conditioning but
may use extraction system from time to
time.Usually industrial sites with
noticeable air pollution, loading bays,
dusty production, underground platform,
equipment rooms, facilities using natural
air ventilation.
Usually less than 0.03%
obs/m {<0.01% obs/ft}
At least every 18 months At least every 12 months High relative humidity, frequent
wash-down. May require water-
trap in high humidity climate.
5 Open environments, airborne particle
clearly visible, sometime require wash-
down to maintain acceptable health
standard for occupants. May use
extensive stage smoke or fog.
Applications like amusement park rides,
coal fired power station, fertilizer factory,
waste-treatment, tunnels, bus terminals,
etc.
Usually above 0.03%
obs/m {>0.01% obs/ft}
At least every 12 months At least every 6 months Refer to Class 6 (Special Case).
May require water-trap in high
humidity climate.
6 (Special
Cases)
Usually fits within "High" and "Extreme"
definitions. Regular fumigation (such as
tobacco storage), corrosive, radiative,
irregular process, high level of fine dusty
environment such as cement, textile,
welding, oily, steamy, etc.
Varied Closely monitor for the
first 3 to 6 months to
develop a filter
replacement guideline
Closely monitor for the
first 3 to 6 months to
develop a maintenance
schedule
Consult with Risk Manager, refer
to local codes, standards and
regulations to ensure compliance.
Regular smoke tests are required.
May require water-trap in high
humidity climate.
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