Sticking ans Seizure: Sticking (British) and seizure (American) are two different terms with the same meaning. In the following, we shall use the term “sticking”.

Sticking occurs when the two seal rings are locked or partially welded together. The locked state results in a failure if the interconnection is higher than the starting torque of the motor. It may also result in mechanical damage of seal parts. The main causes of sticking are precipitation of sticky materials from the pumped medium on the seal faces or corrosion of the seal faces.