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The metal parts of mechanical seals, such as springs, set screws, transmission parts and metal sleeves, can be the source of seal failures, because the metal parts will corrode rapidly under stress. Commonly used stainless steel springs are susceptible to stress corrosion by chlorides, and there are many chlorides in the world, so some foreign departments suggest not to use stainless steel springs, but to use springs of Hastelloy steel for they are with high corrosion resistance .In addition, spring fatigue caused by improper assembly is another cause of failure.
The fixing screws used in the mechanical seal should not be made of hardened materials, because the heat treatment will reduce the corrosion resistance of the metal, and the softer fixing screws without heat treatment can be fastened tightly to the shaft.
Vibration, deflection, and misalignment will cause the transmission parts to wear. For example, if the sealing surfaces of the mechanical seal stick when being started, the transmission parts will be bent or even damaged, and the heat generated by friction often exacerbates corrosion.
The wear marks on the outer surface of the metal sleeve may be caused by solid particles entering the sleeve from the sealing side, which interfere with the follow-up ability of the mechanical seal. These marks may also be caused by being skewed or being not concentric.
Metal part will change color during temperature rise, so paying attention to the color can get knowledge of the temperature. For example，stainless steel changes colour this way at the following temperatures when using it as the material of metal part of the mechanical seal.
Light yellow----Temperature is 700~800°F (about 370~432°C)
Brown----Temperature is 900~1000°F (about 486~540°C)
Blue----Temperature is 1100°F (about 590°C)
Black----Temperature is 1200°F (about 648°C)
（If you want to view other products，pls visit this website component seals）
The fixing screws used in the mechanical seal should not be made of hardened materials, because the heat treatment will reduce the corrosion resistance of the metal, and the softer fixing screws without heat treatment can be fastened tightly to the shaft.
Vibration, deflection, and misalignment will cause the transmission parts to wear. For example, if the sealing surfaces of the mechanical seal stick when being started, the transmission parts will be bent or even damaged, and the heat generated by friction often exacerbates corrosion.
The wear marks on the outer surface of the metal sleeve may be caused by solid particles entering the sleeve from the sealing side, which interfere with the follow-up ability of the mechanical seal. These marks may also be caused by being skewed or being not concentric.
Metal part will change color during temperature rise, so paying attention to the color can get knowledge of the temperature. For example，stainless steel changes colour this way at the following temperatures when using it as the material of metal part of the mechanical seal.
Light yellow----Temperature is 700~800°F (about 370~432°C)
Brown----Temperature is 900~1000°F (about 486~540°C)
Blue----Temperature is 1100°F (about 590°C)
Black----Temperature is 1200°F (about 648°C)
（If you want to view other products，pls visit this website component seals）
