Kareem B.,Federal University of Technology Akurre |
Jewo A.O.,Petroleum Training Institute
Engineering Failure Analysis | Year: 2015
In this study, a mathematical model was developed for failure prediction on critical equipment in petrochemical industry. The model utilized three principal measurements, namely: temperature, vibration and pressure, in developing a framework for determining expected failure periods for each component of the critical equipment. Validation of the model was done using data collected from Warri Refinery and Petrochemical Company, carbon black plant, Ekpan-Warri, Nigeria. Condition monitored data based on the three principal measurements were generated and used to determine expected failure periods for each component of the critical equipment (single-stage centrifugal compressor) in the plant. It was observed that for all the equipment under consideration, the life expectancy for blower casing is longest for all components, while that of gear and gear bearing is least. Hence, special attention should be focused on monitoring the condition of the gear and its bearing components. It was also observed from the plot trends that the deterioration rate of all components is affected by the equipment operating speed condition and functionality. © 2015 Elsevier Ltd.
Akaranta O.,University of Port Harcourt |
Agiri G.O.,Petroleum Training Institute
African Journal of Biotechnology | Year: 2010
The synthesis of triazine based reactive dyes was carried out. The resultant dyes were characterized by thin layers chromatography, molecular weight, infrared and ultra- violet spectroscopy, and used in dyeing cassava mesocarp to produce dye modified cellulosic substrates. The dyed substrates were tested for dye fixation, fastness (acid, alkali, wash) and solvent stability. Results obtained show that the dyes have excellent dyeing properties attributable to chemical bond formation between the dye molecules and the hydroxyl groups of the substrate (cassava mesocarp). The satisfactory fastness properties and good dye fixation on the substrate are of importance in the preparation of stable and efficient dye modified cellulosic ion exchange resins. © 2010 Academic Journals.
Nwobi-Okoye C.C.,Anambra State University |
Okiy S.,Petroleum Training Institute |
Igboanugo A.C.,University of Benin
Ain Shams Engineering Journal | Year: 2015
This work reports an improved and novel new method of evaluating the performance of multi input single output (MISO) processes, as exemplified by a brewery. This new method involves the combination of transfer function modeling and fuzzy logic and was used in evaluating the six years performance of a brewery. Of the six years, the period 2010-2011 with a performance rating . λ of 0.810 which corresponds to the linguistic variable 'Good' recorded the best performance while the period 2008-2009 with a performance rating . λ of 0.381 which corresponds to the linguistic variable 'Fair' recorded the worst performance. The result of this study is expected to open new ways of improving maintenance effectiveness, utilization of raw materials and efficiency of multi input single output (MISO) production processes. © 2015.
Onoji S.E.,University of Witwatersrand |
Onoji S.E.,Petroleum Training Institute |
Iyuke S.E.,University of Witwatersrand |
Igbafe A.I.,Afe Babalola University |
Nkazi D.B.,University of Witwatersrand
Energy Conversion and Management | Year: 2016
The global energy demand is currently met by the use of non-renewable fossil fuels. The challenges of non-availability of these fuels in the future, instability in prices of crude oil and its negative environmental impacts, stimulated researchers in the global community in search of renewable energies for replacement of fossil fuels in future. Biodiesel has been identified as a good complement and plausible replacement of fossil diesel because of the overwhelming characteristic properties similar to fossil diesel in addition to its good lubricity, biodegradability, non-toxicity and eco-friendliness when used in diesel engines. The production of biodiesel from edible vegetable oils competes with food consumption and consequently high cost of food and biodiesel. Studies have shown that rubber seed contains 35-45 wt.% oil which portrays a better competitor to other non-edible oil bearing plants in biodiesel production. Biodiesel produced from non-edible rubber seed oil (RSO) is an attractive option for the sustainable development of sub-Saharan Africa (SSA) countries that depend heavily on fossil diesel. The application of abundant plantain (Musa paradisiacal) peels considered as waste in SSA countries as heterogeneous base catalyst in RSO biodiesel production will further reduce the cost of biodiesel. Rubber trees (Hevea brasiliensis) are grown domestically in large plantations solely for latex production in most tropical SSA countries and the seeds fall out as waste to the ground either to germinate or are collected and discarded annually. However, SSA countries have an estimated combined capacity of 717,750 ha of rubber trees equivalent to 251 million trees that can generate on annual basis, about 107,662.5 ton of rubber seed, 17,947.339 ton of rubber seed oil and an equivalent 16,691.025 ton of biodiesel. The cultivation of natural rubber trees will sustain the production of rubber products from latex and seed oils for biodiesel which would create additional financial benefits to the plantation farmers and reinvigorates the economies of the local communities in SSA countries. © 2015 Elsevier Ltd. All rights reserved.
Nwaoha T.C.,Federal University of Petroleum Resources |
John A.,Petroleum Training Institute |
Adumene S.,Rivers State University of Science And Technology
Ships and Offshore Structures | Year: 2015
Complexity of modern and large ships poses a challenge to effective and comprehensive reliability and safety assessment of the propeller operations. The marine propulsion system forms the fundamental of ships' operations. The propeller reliability and safety directly affects the safe operation of the ship including its cost performance. Therefore, focusing this research on examination of safety and reliability of the propeller operations is paramount. In view of this, propeller operations are analysed to facilitate identification of their various failure modes and associated risk implications under uncertainty. Furthermore, advanced algorithms, such as fuzzy logic, evidential reasoning (ER), analytical hierarchical process (AHP) and expected utility theory, are used to develop a robust methodology that can be employed in assessment of safety and reliability of the propeller operations. Application of the developed methodology shows that the safety and reliability of ship propeller operations are not at optimal levels. These results show that a combination of fuzzy logic, ER and AHP algorithms can be used to assess the propeller operations' safety and reliability to a certain degree of confidence, while expected utility theory can reveal the risk implications of the various failure modes. For instance, expected utility theory is used to find out that wake induced forced oscillations of the blades is the riskiest failure mode of the ship propeller operations. © 2015 Taylor & Francis