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Whether or not instruments will operate properly at a WRRF often depends on how they are installed. Installation drawings show how instruments should be mounted and installed. When creating these drawings, designers should make sure that each instrument will be accessible for maintenance. Designers also should review specific manufacturer installation details for any special requirements that should be included with the drawings. Guides from other industries can also be useful. For example, the American Petroleum Institute provides procedures for installing the more generally used measuring and control instruments and related accessories. Finally, as part of the design process, a schedule of deliverables to the client is required (see Table 3.4 for a typical deliverable schedule for a project design by a consulting engineering firm).

TABLE 3.4 An example of a milestone schedule for a typical control system design for a WRRF.