Page 85 - Steam Turbines Design, Applications, and Rerating
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66 Chapter Three
Figure 3.18 Single housing orifice design resulting in
subsynchronous vibration. (RMT, Wellsville, N.Y.)
tively long pad. The designer, desiring lower pad operating tempera-
tures, used open-end seals that resulted in a relatively low housing
pressure of 1.3 psig. This low housing pressure coupled with the long
pad caused oil starvation and a subsynchronous rotor vibration. The
spray bar design shown in Fig. 3.19 distributed the oil along the full
axial length of the pad and was successful in eliminating the subsyn-
chronous rotor vibration.
Figure 3.19 Multiorifice spray bar design. (RMT, Wellsville, N.Y.)
