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
