With Kaplan turbines, runner blade trunnion seals play a key role in maintainin​g reliability, efficiency, and protecting the environment from oil seepage. A survey conducted among Kaplane turbine owners found that inefficient or failed blade trunnion seals cause more than 60% of Kaplan turbine Leakage. In this paper, we address best practices around selecting, installing, and supporting Kaplan runner blade trunnion seals to maximize your investments and efforts.