Instrumentation & Control

General

The Glasgow WTP control system was designed as a conventional computer control automated plant with manual adjustment and override features. The plant was designed to operate 21 hours per day as needed but is normally staffed on an 8 to 12 hour per day schedule. A second shift with minimum staff may be needed during peak demand periods in the summer months. During the night-time hours, critical treatment processes are monitored and alarmed. A computer alarm system is activated, and operators are sent in response to alarm conditions during the off-hours.

The main plant control system (Plant PCS), monitors plant functions and provides a user interface in the form of a desktop computer in the office in the WTP building. Control of most major plant equipment is performed at local panels near the major equipment. Equipment is typically run in automatic mode, in response to signals from the Plant PCS.

Table 5-1 lists the local control panels where the various elements of the plant instrumentation and control system are located.

Local Control Panels