Four products (A-D) are made in a batch processing plant. The times (in hours) required for each piece of equipment for each product are shown in Table P3.22.

Using this information, answer the following questions. Note that you do not have to draw a Gantt chart to answer any of these questions. Note that all products use the equipment in the same order unless that equipment is not used.

• Over a 600 h period (approximately 1 month), the required number of batches for products B and D is 15 and 10, respectively.
• The demand for products A and C is such that three times as many batches of A compared to C are required. Determine how many batches of A can be manufactured if single-product campaigns are used. In this problem, you should use the exact cycle time expression for each product.
• Repeat Part (b) but use the limiting cycle time for each product.
• For a process with unlimited intermediate storage (uis process) and an equal number of batches for each product, determine the maximum number of batches for each product using a mixed product campaign (ABCDABCD… or ACBDACBD…, etc.) in a 600 h operating period.

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Table P3.22 Equipment Processing Times for Problem 3.22 Product Mixer/Heater Reactor Filter Crystallizer Packaging A B BCD с 1.5 2.5 1.5 3.5 2.5 0.5 Not used 1.5 2.5 4.5 3.5 4.5 Not used6.0 1.3 2.5 2.0 3.5 1.5 1.5