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• W96408595 abstract "Conventional trough belt conveyors have been used extensively in bulk solids handling in industry for a long period of time. An overland conveyor belt is a bulk materials handling means of transportation of mined products, over long distances. During the past two decades, a significant amount of motion resistances have been mitigated as the result of decreasing the number of idlers supporting the belt, by increasing the idler size and spacing. It has been evident that these advancements have pushed a trend for the design of conveyor systems to become longer and faster.This thesis has been proposed to explore the net present value (NPV), Equivalent Cost (EC) and Equivalent Annual Cost (EAC) effects of the trend in the materials handling industry, towards increasing idler size and spacing. The concern is that the trend is actually driven by the competitiveness developed between engineering firms, to win the contract by decreasing initial capital costs. However, when developing the solutions, the overall lifecycle cost should be considered, so that designs are in the best economic interests of the client. The hypothesis this thesis will explore, is the possibility that there is an economic optimum to the idler size and spacing.To test this hypothesis, a theoretical experiment will be developed using a computer program, Belt Analyst 2007 to conduct 6th edition CEMA calculations and a lifecycle cost economic analysis, on the capital (CAPEX) and operational (OPEX) costs. In the interests of local engineering firms, the analysis will be completed using an overland conveyor, transporting coal, situated on the eastern seaboard of Australia. Though this is our base model, the thesis has presented its methodology so that it can be replicated to conduct the analysis for other bulk materials, applications and locations.An in depth literature review, which highlighted conveyor energy losses, trends and optimisation programs, contributed to the development and validation of the ‛Reibelt economic analysis program‛. This program found the following results which are covered in greater detail within the report.• The hypothesis that there is an optimum carry idler spacing was confirmed.•The optimum carry idler spacing for this analysis was 3.5 metres + or iV 0.5 metres for tonnages up to 3000 t/hr. •The optimum velocity for the tonnages up to 3000 t/hr is between 5 and 6 m/s.• There is no defined optimum idler size, as it is determined by the load each idler set must withstand. To strive for the mitigation of idler indentation resistance by increasing the roll diameter financially, benefits the project.Also in the recommendations section, a number of improvements to the industry are proposed, based on the resulting trends found in this thesis. The main improvement is that the decision making process for carry idler spacing should involved in depth consultation with the client, since the idler spacing trend is mostly determined by the operational expenses and not the capital expenses. With the implementation of these recommendations made in this thesis, millions of dollars could potentially be saved." @default.
• W96408595 created "2016-06-24" @default.
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• W96408595 date "2008-01-01" @default.
• W96408595 modified "2023-09-26" @default.
• W96408595 title "Net Present Value Analysis in Idler Selection Optimisation for Design of Overland Conveyor Systems" @default.
• W96408595 hasPublicationYear "2008" @default.
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