The manufacture of soda ash in the Arabian Gulf

Article Abstract:

Soda ash is manufactured using a variety of processes. Two technologies, namely the standard solvay and dual methods, are evaluated and compared with respect to relative profitability as applied to a plant in Al Jubail, Saudi Arabia. Analysis reveals that soda ash product costs for the Solvay method amounts to $131.51 per ton, while that of the dual method stands at $144.23 per ton. Accounting for a probability accuracy of plus or minus 20% results in costs of $105-152 per ton for Solvay and $115-173 per ton for the dual method. These prices are much lower than estimated costs for a ton of soda ash delivered to the Arabian Gulf, pegged at $176 per ton.

Analysis, Saudi Arabia, Cost benefit analysis, Chemical processes, Sodium carbonate

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Effects of discounting and demand rate variability on the EOQ

Article Abstract:

The economic order quantity (EOQ) formula was analyzed under the presence of a reduced expected discounted costs and a Poisson process-modelled demand. The simple (discounted cost) ordering quantity formula was found to be much closer to the optimal (discounted cost) ordering quantity than the conventional EOQ formula when the demand rate is small and the fixed ordering costs are high. The demand variability was found to exert a minor effect on the optimal ordering quantity.

Inventory Control, Models

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The economic manufacture/order quantity (EMQ/EOQ) and the learning curve: past, present, and future

Article Abstract:

A study was conducted to analyze the effect of learning on the lot-size problem and the feasibility of using some concepts adopted by just-in-time systems to the problem. The importance of learning in the production of a new product, machine changes or production restarts was examined. Results indicated possible extensions to the lot size problem, including studying the effects of learning and forgetting on set-up frequency and the lot-size quantity.

Material Handling Equipment Manufacturing, Construction and Related Machinery, Automated Materials Handling Eqp, Materials handling equipment, Automation, Just in time inventory systems, Just in time systems, Learning curves, Experience curves

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