MSEB in India Boosts MW Output with Velocity Control

Maharashtra State Electricity Board placed the order with CCI for 64 replacement superheater and reheater spraywater control valves as well as steam control valves at five of its coal-fired 150 MW units in Maharashtra State, India. The previous valves did not meet performance requirements which hurt plant efficiency, since the valves in these services suffered from leakage and lack of controllability.

DRAG® technology employs stages of pressure reduction, to limit the damaging effects of valve trim exit velocity (100 feet/second [30 meters/second] maximum) in the case of water and velocity head (70 psi [4.82 bar] maximum) in the case of steam. Controlled flows in these valves vary from to 40 meters/hour (88,000 pounds/hour) with inlet pressures as high as 160 kilograms/centimeter2G (2275 psig) and DPs up to 146 kilograms/centimeter2G (940 psi) at temperatures ranging up to 247 C (475 F). All control valves will be operated by double acting piston, pneumatic actuators.

This MSEB order is particularly remarkable because it represents across-the-board replacement of a variety of failed control valves from various manufacturers in these critical power-plant services with advanced DRAG® technology.

Published in SOLUTIONS Spring 2001