6.1.1 The purchaser shall specify the period of uninterrupted continuous operation, during which time the equipment should not require shutdown to perform maintenance or inspection.NOTE 1 It is realized that there are some services where this objective is easily attainable and others where it is difficult.NOTE 2 Auxiliary system design and design of the process in which the equipment is installed are very important in meeting this objective.NOTE 3 Section 9.2.3 requires the vendor to identify any component or maintenance requirement that would result in the need to shut down the equipment within the uninterrupted operational period.