The performance of the mechanical seal failure and the reasons

Mechanical seal failure in the operation of rotating equipment parts which, they would often wear the seal faces, thermal cracking, deformation, breakage, etc., will be the spring with a long relaxation, fracture and corrosion. Secondary seal cracks will appear, twisted and deformed, broken and so on.

Mechanical seal vibration, heat cause of the malfunction
During rotation of the device, causes the end face of the static ring bonded rough movement ring and seal chamber gap is too small, the runout caused by collision induced vibration. Sometimes, because of the seal faces resistance to corrosion and heat resistance poor or insufficient cooling or end during the installation folder particulate impurities can cause mechanical vibration and heat sealed.

Reasons for failure of the mechanical seal media leaks
(1) Static pressure leak test. Because of the mechanical seal is not careful when installing, tend to make the seal faces are bruised, deformation, damage, clean up without a net, there are the granular impurities, or due to loose screws, no compression gland, machinery, equipment, precision is not enough , so that the sealing surface is not completely fit, will cause media leaks. If it is missing sleeve bushing seal assembly is pressed or not enough compression or damage. (2) periodic or episodic leakage. plastic strap seal Mechanical seal rotor assembly periodic vibration, axial runout too, can cause leakage. Mechanical seal sealing surface pressure to have a certain ratio, so as to function as a sealing, mechanical seal which requires to have a certain amount of compression of the spring, a thrust force to the seal faces, so that the rotating sealing surface sealing up the required ratio pressure. To guarantee this one than the pressure required mechanical shaft seal can not have too much channeling amount, generally to ensure that within 0.25mm. However, in practical designs, the design is unreasonable, the shaft tends to produce a large amount of channeling, the use of mechanical seals are very unfavorable. (3) recurrent mechanical seal leakage. Frequent cause of mechanical seal leaks in many aspects. Firstly, since the seal faces recurring defects caused by the leak. The second aspect is secondary seal caused by recurring leaks. Third, the spring leakage defects. Other aspects include leakage rotor vibration caused by bad driving, and thrust tight or loose parts quality caused leaks, leaks caused by mechanical seal auxiliary organizations, the media due to problems caused by recurrent leakage. (4) mechanical seal vibration is too large.plastic strap seals Mechanical seal vibration is too large, resulting in loss of seal. But the mechanical seal is often the cause of vibration larger reason than just mechanical seal itself, other parts of the pump is also the root cause of vibration, such as shaft design is unreasonable, because of processing, lack of precision bearings, parallel coupling poor, radial force and other reasons