fans presentation

1. The centrifugal fan is the heaviest of the three designs for any
given duty with the largest rotor weight and inertia
With respect to maintenance, the access to the bearings is good,
allowing simple replacement. The rotor removal is relatively
straightforward
Maintenance
‫الصيانة‬

2. The fan should
not be operated
unless the
vibration velocity
of the fan is less
than 0.20 inches
per second
FanVibrationChart
‫المروحة‬ ‫إهتزاز‬ ‫مخطط‬

9. Material buildup on
Impeller
‫الم‬ ‫ريش‬ ‫على‬ ‫الخام‬ ‫تراكم‬
‫روحة‬
(
‫التكويت‬
)
Thermal ‫حرارى‬
Chemical ‫كيميائى‬
Mechanical ‫ميكانيكى‬
Electrostatic ‫كهربائى‬

10. Vibration - Hot shutdown effect
‫المفاجئ‬ ‫التوقف‬ ‫تأثير‬
-
‫اإلهتزاز‬

11. Inlet box
Erosion-effect of Improper inlet connection
‫مناسب‬ ‫الغير‬ ‫المدخل‬ ‫على‬ ‫التآكل‬ ‫تأثير‬

12. Erosion –liner material
‫للتآكل‬ ‫المقاومة‬ ‫المبطنة‬ ‫الخامة‬

13. Maintenance Instructions for Kiln
Induced Draft Fan
‫الفرن‬ ‫سحب‬ ‫لمروحة‬ ‫الصيانة‬ ‫تعلميات‬
A - Check the following per shift :
1. Check the oil level in the fan bearings.
2. Observe the bearings temp and vibration levels.
3. Check the main motor winding temp.
4. Listen for any excessive or abnormal noise.
5. Observe the fan speed.

14. B - Check the following per week.
1. Follow the previous items.
2. Check if there is oil leakages

15. C - Alarm and trip conditions.
Trip
Alarm
Function
~ 85 oC
~ 75 oC
Temp.o
9.5 mm/s
RMS
5.5 mm/s
RMS
Vibration

16. D - Check the following for wear.
1. Examine The Following
2. Fan casing.
3. Inlet boxes.
4. Louver damper (blades, spindles and supports).
5. Impeller.

17. E - Notes on wear.
‫التآكل‬ ‫على‬ ‫مالحظات‬
1. Abrasive action on fan impeller is most severe at blade tips
and at the periphery at centre or side plates.
2. Blade liners and wear strips to protect the blades.
3. The liners should be always be replaced completely as soon
as the erosion on tem is too severe.
4. It is dangerous to weld alloy steel unless the correct
procedure is known and followed.

18. F - Check periodically the oil levels for
bearing gear at non-drive end of fan shaft
‫الحركة‬ ‫إدارة‬ ‫تروس‬ ‫لبلى‬ ‫الزيت‬ ‫مستويات‬ ‫فترات‬ ‫على‬ ‫إفحص‬
‫البطيئة‬
Bearing gear will continue to turn the fan
at ~ 25 r. p.m after main drive has been
switched off.
Note:

19. Any Questions ?