Georgia Pacific Replaces Two-Valve Control System with a Single Valve

At Georgia Pacific’s Nekoosa Paper Mill in Ashdown, Arkansas, a failed feedwater flow-control system has now been replaced with a single valve. Previously, two valves had been used in parallel – one for flow control and one as a block valve. The former had performed poorly, providing uncontrolled flow, and the latter had been leaking while closed about 95 percent of the time.

The new single DRAG® valve is “characterized” for better flow control, and is provided with Class V shut off seating to prevent leakage during the vast majority of the time when it is shut off.

Design conditions for this 1.5-inch (37 millimeter) multi-stage pressure-control valve specify flows from zero to 270,000 pounds/hour (123,000 kilograms/hour) at an inlet pressure of 1550 psia (107 BarA), and the P is 1490 psi (103 Bar) at 400 F (294 C).

Published in SOLUTIONS Winter 2000