Leak |
Occurrence location |
Cause |
Sliding area |
Poor contact area sealing |
●incorrect assembled material shape and dimension ● insufficient buffer with shaft, press too tight ● poor machining on contact surface |
Abnormal worn contact area |
● caused by dry run ● caused by material erosion ● foreign object enters |
Poor installation |
● loose and poor tighten
● vibration |
Improper selection |
● insufficient operating condition |
Shaft circumference area |
Leak out from shaft circumference |
● improper material and dimension ● same as above, damaged during installation
● poor machining for shaft surface tolerance |
Seal cover circumference area |
Stuffing box contact surface |
● poor machining
● tilted screw lock ● poor sealing gasket |
Sealing ring |
● poor installation ● seal cover distorted ● contact face overheat caused cracking ● flushing pressure is too high |
Indirect causes |
Vibration and other abnormality |
● pump ● shaft ● installation ● temperature condition change during operation |