Oil cooler is an important part of the unit; the leakage can be a direct result of the injury and Thrust bush-burning, lower heat dissipation, resulting in serious accidents and major losses. In order to maintain the safe operation of the unit, in practice, summed up the oil cooler leak following a few preventive measures.

(1) For the oil cooler tubes, rubber seals and other serious aging and severe corrosion of steel body, to repair the unit when the overhaul and expansion of the oil cooler to replace one by one, to completely remove the security risk.

(2) In order to prevent vacuum leaks, no water in the unit shut down before closing all access to the water valve; through the water, the first through the water inlet valve open, and finally opens the drain valve.

(3) In order to prevent the oil cooler back side mounted brass is scratched when punctured, the oil to be divided by units of the chamfer board, down sharply, or will be oil board to epoxy board, or the oil cooler side of the installation to protect iron.

(4) Back to the oil cooler mounted in front, must be provided sufficient water pressure, the pressure of 0.4 MPA, holding pressure without leakage at least 30 min before proceeding back to the installation.

(5) oil cooler back when the non-collision equipment, installed back on the tank full of oil after the first observed 24 h, confirmed that no leakage in the oil level back to normal after the installation ring and connecting pipe.

(6) The proposed installation and high reliability of the oil mixing with water dynamic monitoring devices to detect and display of hydro-generating unit oil mixed with water content of the system, and to some limited extent automatically send alarm signals to ensure the safe operation of the unit.