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MVA 02 rev 5 - December 2017
12.3 Programmed maintenance intervals
The intervals of time suggested constitute a working basis for the customer, who must according to
circumstances make any modifications necessary for the specific operating conditions.
Programmed maintenance intervals according to intensity of use
Intensity of use
High
Medium
Low
For all fans
1
Check perfect condition of all guards and warning symbols. See paragraph
1.3 and 6.2.1
1 month
1 month
1 month
2
Check correct tightness of all nuts and bolts in accordance with Chart 12-1,
above all in presence of cyclical thermal gradients
1 month
3
months
6
months
3
Check that the impeller is free from defects due to wear and corrosion. See
paragraphs 6.2.2 and 6.2.3
1 month
3
months
6
months
4
Check that impeller is clean
1 month
6
months
12
months
5
Check for absence of dangerous vibrations. See also paragraph 3.8.4
1 month
6
months
12
months
6
Check for absence of abnormal noise
1 month
6
months
12
months
7
Check for correct lubrication of motor bearings. See paragraph 8.1
1 month
6
months
12
months
8
Check electrical operating parameters of motor and servomotors installed
1 month
6
months
12
months
9
Check perfect condition of all accessories installed
1 month
6
months
12
months
Additional maintenance for fans with belt-drive transmission
10
Check tension and wear of drive belts. See paragraph 8.4
1 month
3
months
6
months
11
Check condition of lubrication of bearings in accordance with paragraph 8.1
See also transmission
information card
12
Check temperature of supports containing bearings. After an initial increase
due to running in, temperature values should remain constant over time.
1 month
3
months
6
months
Additional maintenance for fans with flexible coupling transmission
13
Check alignment and lubrication of coupling. See paragraph 8.5
1 month
6
months
12
months