ดาวน์โหลด All Proceeding - AS Nida

Table 4 Assess Criticality - MC3
Weight
Machine Code
3
SEI
3
EM
2
UR
1
MCT
MC
Criticality
Code
Hydra Pulper 3 3 3 2 26 A
Pulp Pump #1, #2 2 2 3 2 20 A
Pulp Pump #3 2 3 3 2 23 A
HD Cleaner 1 2 2 3 16 B
Fiber Separator 1 2 2 3 16 B
Reject Separator 1 2 2 3 16 B
Pulp Pump #4, #5 3 3 3 2 26 A
LC Cleaner 1 2 2 3 16 B
Pressure Screen 1 2 2 3 16 B
Decker Thickener 1 2 2 3 16 B
Pulp Pump #6 2 2 3 2 20 A
Pulp Pump #7 2 2 3 2 20 A
Refiner 1 1 2 1 11 C
Pulp Pump #8 2 3 3 2 23 A
Pulp Pump #9 2 2 3 2 20 A
Stuff Box 1 1 2 1 11 C
The machine criticality in Table 2-4 indicated the most
critical machines are “Pulp Pump” (Criticality code: A) which mostly is
centrifugal pump (Show in figure 6). It will be item that define the
maintenance for this paper. The component details are as table 5.
Figure 6 Sample of Pulp Pump
243
Table 5 Component Details- Pump
Components Functions
1. Motor
- Power generators.
2. Belt
- Used for transmitting power to shaft
3. Shaft & Shaft sleeve - Send torque to drive the pump impeller.
4. Pump bearings - Keep up the rotation of the pump shaft.
5. Motor bearings - Keep up the rotation of the spindle motor.
6. Packing - Prevent leakage of the pulp.
7. Flange
- Against splashes of water into the pump
bearings.
8. Impeller - Pulp suction.
9. Body
- Covered impeller pump.
10. Pulley - Wearing belts to transmit power.
11. Pump base - Hold motor and pump in place.
4.3 Failure Mode and Effect Criticality Analysis
Once the component detail has been identified, the next is to
analyze by using FMECA in order to consider failure root cause,
included failure mode and risk level, by selecting the highest RPN for
each components to collect the time to fail to perform failure data
analysis in the next step. Table 6 shown failure mode for used to collect
the failure data.
Table 6 FMECA – Components of Pulp Pump
Components Failure Mode RPN
Risk
Evaluation
1. Motor Motor burns. 84 High
2. Belt Damaged or broken belt. 84 High
3. Shaft ,Shaft sleeve Shaft wear or bend. 84 High
4. Pump bearings Bearing broke 252 Critical
5. Motor bearings Bearing broke 84 High
6. Packing Wear, pulp and water leaks 252 Critical
7. Flange Wear, water splashes into the bearing 70 Moderate
8. Impeller Wear due to a hotchpotch 98 High
9. Body Wear due to friction 70 Moderate
10. Pulley Pulley loose off 84 High
11. Pump base Base loose due to rust 84 High