Enviado por arvindo.candeio3

EIT Review AJC 2016

Propaganda
AÇUCAREIRA DE XINAVANE, S.A.
FRONT REPORTXinavane Sugar Mill
Arvindo Candeio
Mechanic EIT
[email protected]
Diffuser Drive
25 Oct. 2016
Outline
 Introduction

Mill No.3 SWR Coupling Failure

Cail G/Box White Metal Failure


Other Experiences
Recommendation
1
Introduction
Xinavane Sugar Mill operates continuously
during the sugar cane cropping season which
runs 6 months.
It is important that the plant down-time should
be maintained at an absolute minimum during
this period.
2015/ LTA =8.5%
A
2016/ LTA = 5.8 %
LTA < 4 % It's Possible
D
B
C
2
Mill No.3 Coupling Broken & G/Box
Displacement
01/02 June 2016
24 Hours
21/22 June 2016
10 Hours + Rain Stop
3
Failure Analysis
Mill 3 Frequency
Torque Mill 3
Torque Mill 2
4
Visual Examination
Broken bolts
White weld bead
black weld bead

Cause of Coupling Failure:
Human errors (Lack of Preventive maintenance scope)

Fatigue;
5
Recommendation
Mill Coupling:

Install safety guarding to prevent injury to
personnel;

Good Maintenance Practice must be done:
Visual inspection of Swing Parts ;
Welded parts of coupling check presence of cracks;
Develop welding procedure;
Steel Wire Rope inspection ‘’Critical’’

Alignment checks required every 2 years.

Replace the SWR Coupling with Polyester sling
coupling.
6
Mill No.1 G/Box Bearing Failure
Cause of
Failure:
Axial thrust
DESCRIPTION
UNIT PRICE
ZAR
TOTAL COST
ZAR
ITEM
QTY
UNIT
1
2
each
250 bore x315 long gearbox
bearing
27,940.00
55,880.00
2
2
each
315x400 long gearbox bearing
36,260.00
72,520.00
7
Proposal & Benefits
8
Recommendation

Improve the lube oil system and incorporate control
system:
White Metal Bearing Temperature
Lube oil tank level
Lube oil Pressure
Bearing Vibration

Training must be done to the fitters in order to follow
up the good maintenance practice of Tail bar
coupling and white metal bearings.
9
Other Experience
 Dewatering Mill Inspection and Maintenance;
Diffuser Gearbox Disassembly and Installation;
10
 Project New Cooling Tower;
 Shredder Hammer Removal by hydraulic System;
 Batch Centrifugal Motor Assembly;
 Front End NDT Analysis;
 Incident Prevent and Corrective Action.
Thank You
11
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