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Articles by Basil Okafor
Total Records ( 4 ) for Basil Okafor
  Basil Okafor
  Four multiple regression models of press speed and throughput capacity were developed to examine the trend of wear in screw presses used in palm oil mills. A study by the author shows that the press unit constitutes point of severe wear in palm oil mills. Result shows that double-log model gave the best fitting curve for predicting the combined influences on the flights wear by the press speed and throughput capacity.
  Basil Okafor
  Metal wear has been identified as the main problem facing screw presses used in palm oil mills. The flights of the press screws experience severe wear. In a related research by the author (reported elsewhere), a multiple regression double-log model was developed to predict wear in press screws used in palm oil mills. The model served as best fitting curve for predicting wear in the system. Using the model, optimal operating conditions of press speed and throughput capacity has been established. Wear of flights is reduced to minimum at optimal press speed of 8 rev min 1 and 2.8485 E-10 m3/s throughput capacity.
  Basil Okafor , Steve Odi-Owei and P.P. Jombo
  Tests were carried out on carefully collected samples to determine the mechanical properties and chemical composition of the screws. This is aimed at recommending the best of tribological material for the system. The tensile test result shows that the ultimate tensile strength of the press screws is 1.26E07 KN m with an overall per cent elongation of 19.1%. Hardness test indicated that the screw is of medium hardness, with a hardness number of HRC40.10. The chemical analysis shows that the screw is a carbon steel with a carbon content of 0.317%, alloyed with Silicon (Si) and Manganese (Mn) elements. A press screw made of silicon-manganese cast steel with 1.20% carbon content, 1.27% silicon and 1.30% manganese is recommended. It is suggested that the material be hardened by heating to 1050°C and quenched in oil. Tempering is at 240°C for 6 h to ensure adequate toughness and minimal loss of hardness.
  Basil Okafor
  Metal wear has been identified as the major study of machine breakdown in oil palm mills. This results to serious economic loss owing to such mills operating at a greatly reduced installed capacity. This was the findings from a research visit made to one of the major oil palm mills in Nigeria, Rison Palm Oil Mill, Ubima, located in the eastern part of the country. It was found that the greatest wear and breakdown in the mill occurs in the press screw unit. Measurements on the flight thickness were taken at one week intervals covering a period of six months and the resultant wear curves are discussed. A general review of press screws and the Twin Press Screws in particular-commonly employed in Oil Palm Mills, their operational principles as well as descriptions are highlighted. The wear curves show that the first and the second flights wear most, with initial rapid wear within the first week of operation. Flight 1 witnessed the most wear, followed by flight 2. Flights 4 and 5 suffered minimal wear. Smooth operation with minimal wear was recorded for the next five months after the initial rapid wear of flights 1 and 2, followed by a final stage of rapid wear. For continuous operation, the screw was found to give an average service life of twenty-two weeks. Cast manganese steel is suggested for the screw materials.
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