The W251 Model Series Evolves Along with W501

The two images to the left show the W251B12 50MW-class built at the Westinghouse Canada facility Hamilton, Ontario, since the early 1980s.

As mentioned earlier, the W251 model series followed an evolutionary path from the venerable W191—ranging from 15MW to around 18MW over product life, with more than 180 units sold—and was introduced in 1967, just prior to the W501. The W251A, at a nominal rating of 20MW, was the first to feature cooling of first-stage turbine vane and other stationary parts. Product line charter was moved to Westinghouse Canada in 1985. The W251, at half the rating of the W501, was popular for smaller applications, and about 230 units were sold. The W251B12, shown here, is a 50MW class gas turbine, built at Westinghouse's Canadian plant Hamilton, Ontario. With gear driven generator, the W251 could be used in 50Hz, as well as 60Hz applications.

The last image shows the W251B11 (50Hz) being delivered to project site in India.