Process Steam Reliability Concerns Eliminated for 800 MW Pulau Sakra Plant in Singapore

CCI Switzerland has shipped and installed valves for the complete turbine bypass and process-steam systems in the new, 800 MW Pulau Sakra Power Plant in Singapore . In addition to generating electricity, this plant also supplies process steam to a nearby pulp and paper plant.

The award was based largely upon CCI’s singular ability using DRAG® and other advanced valve technologies to meet extremely stringent specification requirements:

· Reliability requirements exceeding 99.6 percent for all process steam valves due to the need for continuous steam supply to the large adjacent pulp and paper plant.

· Noise requirements of 80 dBA at 3 feet (1 meter) for all process steam valves and 95 dBA for all bypass valves without insulation credit.

· Vibration to be held within VDI 256 standards, which during transients, could not exceed a specified maximum peak-to-peak relative displacement.

The 17 valves involved include two 8-inch by 18-inch (200-millimeter inlet by 459-millimeter outlet) HP turbine-bypass DRAG® valves designed for a flow of 340 meters/hour (750,000 pounds/hour) at an inlet pressure of 1550 psia (107 barA) and a DP of 1008 psi (70 bar) at 975 F (522 C).

Also included is a 14-inch × 14-inch (350-millimeter × 350-millimeter) HP process turbine valve designed for a maximum flow of 465,000 pounds/hour (212 meters/hour) at an inlet pressure of 1015 psia (70 barA) and a DP of 320 psi (22 bar) at 829 F (438 C).

Other valve services include IP and LP process turbine control valves, a variety of desuperheating spraywater control valves, and an IP vent valve. All valves were commissioned successfully and are operating as specified.

Published in SOLUTIONS Spring 2001