Answer: If a mechanical seal begins to leak a lot, it means that the seal has failed. Common abnormal failure reasons are generally the following:
(1) There is a problem with the selected sealing components before installation. This includes the components not being cleaned, the components being damaged (scratches or cracks) or other reasons.
(2) Improper seal installation, which mainly refers to incorrect seal positioning.
(3) Improper seal selection, including improper selection of seal body or seal ring materials, and failure to comprehensively consider various factors such as pressure, temperature, speed and fluid characteristics during design.
(4) Operational error. When the equipment is started, the pressure of the sealing liquid is insufficient, the seal runs dry or the sealing auxiliary system is not put into operation.
(5) There are foreign objects in the sealing chamber. Scale is formed between the dynamic and static rings and the shaft sleeve, causing the spring to lose its elasticity and fail to compensate for the wear of the sealing surface.
(6) The equipment itself is operating poorly, resulting in seal failure. The failure cause is generally excessive shaft stringing, swing or vibration. Once a mechanical seal fails and leaks, it cannot be stopped immediately for maintenance. When the equipment is still running, relevant personnel should immediately go to the site for inspection and carefully observe the working conditions of the equipment to analyze the cause of the failure.
(7) The friction pair is damaged or deformed and cannot run together, causing leakage.
(8) The large spring is not turning in the right direction.
