18. The petroflow company produces three different models of oil well valves for the oil-producing industry. Each valve must be processed through three production departments in this sequence: foundry, fabrication, and assembly. Approximately one week is required for a valve to be completely processed through each department. petroflow is now in the process of capacity requirements planning (CRP) and has just developed this MPS:

NOTE: In answering part (b.), assume that the availabel labor hours in each department per week is 4000 hours and that the machine hours in each department per week is 3800 hours.

Week Model A25 400 300 600 300 200 400 500 300 B34 200 500 300 200 400 600 500 400 C71 500 700 400 600 500 400 600 600 Weekly labor and machine standards for the three production departments are: Found Fabrication Labor Machine Labor Machine Standard Standard Standard Standard Standard Standard Labor Model hrsunit (hrs/unit) hrsut (hrsunit) (hrsunit) (hrshunit A25 B34 C71 2.9 2.6 3.0 2.8 1.5 2.1 3.0 2.9 3.5 2.1 2.5 2.2 2.2 3.2 Determine the labor and machine loads for each department and for all de- partme for lead times between departments) a. nts combined for the first six weeks of the MPS (remember to offset b. What do you conclude and suggest about the loadings of the three depart ments