(1) Shaft seal for the water vapor in the operation of the unit may make the shaft end of the gland seal damage, severe cases will make the unit water impact, endanger the unit safe operation; (2) handle the seal for the water vapor accident, according to Different reasons, take corresponding measures. If it is found that the sound of the unit becomes heavy, the vibration increases, the axial displacement increases, the expansion difference decreases or a negative expansion difference occurs, the vacuum should be immediately destroyed and the valve shut down. Open the shaft seal for the steam system and the body hydrophobic door, listen to the sound inside the machine, measure the vibration, record the lazy walk time, check the crank motor current is normal and stable, crank the value measured after turning. If the lazy walk time is significantly shortened or the machine has an abnormal sound, the thrust pad temperature increases, axial displacement, expansion difference overrun, do not allow the unit to restart without inspection.