Toshiba's retaining ring stocking program means immediate availability for critical 18Cr-18Mn forgings. If machining is required, our engineering and manufacturing personnel will ensure that ready-to-install rings are delivered within the quickest timeframe possible. With one of the largest stocked inventories of forgings in North America, we are able to provide ring sizes that cover 80 percent of the generator fleet - even for multiple ring orders.
Retaining rings are the most critical component of the generator rotor and, under normal operating conditions, are also the most highly stressed rotor component. Retaining rings are critical in the sense that their mechanical failure always has catastrophic consequences on the physical integrity of the machine. As such, retaining rings require the utmost attention during inspection and maintenance. Periodic inspections include visual and NDE methods, such as eddy-current, ultrasonic, and dye-penetrant. Special care should also be taken with older, 18Mn-5Cr rings, especially those in environments where moisture penetration is possible.