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In this paper, two novel efficient solution approaches for the multifloor process plant layout problem are presented. The first one is a rigorous decomposition approach, and the second one is based on an iterative solution scheme. Both approaches, which are based on integer linear programming models, determine the number of floors, land area, floor allocation of each equipment item, and detailed layout for each floor. Their applicability is finally demonstrated by five illustrative examples.

Pipeless plants comprise a number of processing stations and a number of mobile vessels transferring materials to be processed at the stations. Layout considerations has been found to be of particular significance in those plants because they determine the transfer times for the vessels, which can influence scheduling issues. This paper presents a general mathematical programming formulation simultaneously integrating layout, design, and production planning for pipeless plants. The overall problem is formulated as a mixed-integer linear programming model based on a continuous-time-domain representation. The applicability of the model is demonstrated by one illustrative example.

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