Nederman 14550128, Инструкция по эксплуатации

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NCF
27
EN
• During maintenance operations, suitable clothing must be worn, such as closely-fitting
overalls and safety footwear, absolutely avoiding garments that are bulky or with
loose parts.
• During maintenance operations on the fan, it is advisable to fence it off and to identify
it with signs with the wording: “FAN UNDERGOING MAINTENANCE”.
6.1 Visual inspections on blades and casing
Periodical visual checks must be made for wear on impeller blades, given that deterioration
of these parts can create a condition of extreme risk, due to the ejection of the blade or the
failure of structural components, with consequences that may even be fatal.
To monitor phenomena of abrasion on impeller blades and the casing, use a portable lamp
to visually inspect components, slowly rotating the impeller to allow all blades to be seen.
Blades must be totally free from damage and must show no signs or abrasion or missing
sections.
With regard to the phenomenon of corrosion on impeller blades and the casing, corrosive
and acidic environments can reduce the thickness of fan safety components.
This phenomenon must not be underestimated, also because it does not depend solely on
the concentration of aggressive agents.
Condensation may form during pauses in fan operation, and this may accelerate the
phenomenon of chemical corrosion, which in turn may alter the thickness of components,
affecting their integrity.
Table 6-1: Checklist - Dimensional checks on components
Components to check Type of check/
instrument
Criteria for acceptability Result
Impeller: blade thickness Dimension/Caliper Reduction of thickness no greater than 10% in an area without wear or
with paint undamaged
Impeller: thickness of impeller
disk
Dimension/Caliper Reduction of thickness no greater than 10% in an area without wear or
with paint undamaged
Casing: thickness of sides and
sheeting
Dimension/Caliper
or equivalent
Reduction of thickness no greater than 10% in an area without wear
Intake: thickness Dimension/Caliper Reduction of thickness no greater than 20% in an area without wear or
with paint undamaged
Anti-vibration joints: thickness
of anti-wear sheeting (if
present)
Dimension/Caliper Reduction of thickness no greater than 20% in an area without wear or
with paint undamaged
Welding (entire structure) Visual Absence of damage and cracks
Date:
Signature:
6.2 Checking and cleaning parts in contact with the fluid
The fan impeller should be cleaned regularly to prevent vibration caused by dust
accumulating on the blades during operation. If the fan is used to pump even slightly dusty
air, air containing abrasive powders or for the pneumatic transport material, the cleanliness
and wear of the impeller must be checked regularly. Dirt deposits on the impeller or wear
of parts of the impeller can cause undesirable vibrations during fan operation. If any part of
the impeller is excessively worn, it is imperative that the impeller be replaced (for this you
must contact AB Ph. Nederman & Co’s technical assistance service). For any information
and before carrying out any modification to one of our fans, please contact the technical
and quote the part number found on the fan identification plate.