At a $25 million building on a pharmaceutical company’s campus in Research Triangle Park, N.C., the pharmaceutical manufacturer retained a control system integrator to automate a new central utilities building. The control system integrator, which specializes in industrial process control, built a control package to manage the chilled water, steam and compressed air to all facilities on the campus.
The central utilities building serves an aseptic-filling facility and replaces utility service for an existing oral solid-dose facility. The central utilities building consists of four, 1,500-ton water-cooled centrifugal chillers designed to operate in a redundant (N+1) service arrangement. Each chiller has a dedicated primary pump and pumps chilled water to a system-neutral bridge for distribution. Four pairs of variable-frequency-controlled, secondary chilled water distribution pumps operate in a primary/secondary arrangement to draw chilled water from the supply and distribute it to the various areas of the facility. Control (speed) of the secondary pumps is based on the differential pressure of the loop they serve.