多級泵機械密封處滲漏水的一種可能性是機封的動、靜環平面磨損。而形成機封的動、靜環平面磨損的緣由有5個方面：
1、多級泵裝置過緊。察看機械密封的動靜環平面，如有嚴重燒焦現象，平面發黑和很深的痕跡，密封橡膠變硬，失去彈性，這種現象是由于裝置過緊形成的。處置方法：調整裝置高度，葉輪裝置后，用螺絲刀拔動彈簧，彈簧有較強的張力，松開后即復位，有2－4MM的挪動間隔即可。
2、多級泵裝置過松。察看機封動、靜環平面，其外表有一層很薄的水垢，可以擦去，外表根本無磨損，這是彈簧失去彈性及裝配不良形成，或電機軸向竄動形成。
3、水質差含顆粒。由于水質差，含有小顆粒及介質中鹽酸鹽含量高，構成磨料磨損機封的平面或拉傷外表產生溝槽、環溝等現象。處置方法：改良水壓或介質，改換機封。
4、多級泵缺水運轉形成干磨損壞。此現象多見于底閥式裝置方式進口處負壓，進水管有空氣，泵腔內有空氣，自均衡多級泵開機后，機封的磨擦高速運轉時產生高溫，無法得到冷卻，檢查機封，彈簧張力正常，摩擦面燒焦發黑，橡膠變硬開裂。處置方法：排雖然道及泵腔內空氣，改換機械密封。
5、多級泵氣蝕。氣蝕主要產生于熱自均衡多級泵。由于介質是熱水，水溫過高產生蒸汽，管道內的汽體進入泵腔內高處，這部份的汽體無法掃除，從而形成缺水運轉，機封干磨失效，氣蝕裝自動排氣閥，改換機封。
The first possibility of water leakage at mechanical seal is the plane wear of dynamic and static rings of mechanical seal. There are six reasons for the formation of the plane wear of the dynamic and static rings of the mechanical seal:
1. The device is too tight. Check the dynamic and static ring plane of the mechanical seal. If there is serious burning phenomenon, black and deep traces on the plane, the sealing rubber becomes hard and loses elasticity. This phenomenon is caused by the over tightening of the device. Handling method: adjust the height of the device. After the impeller device is adjusted, use a screwdriver to pull the spring. The spring has strong tension. When it is released, it will be reset. There is a moving interval of 2-4mm.
2. The device is too loose. Check the dynamic and static ring surfaces of the machine seal. There is a very thin layer of scale on the surface, which can be wiped off. There is no wear on the surface. This is caused by the loss of spring elasticity and poor assembly, or the axial movement of the motor.
3. The water quality is poor with particles. Due to the poor water quality, small particles and high content of hydrochloride in the medium, there are grooves and ring grooves on the plane or surface of the abrasive wear machine seal. Disposal method: improve water pressure or medium, change machine seal.
4. Dry grinding damage caused by water shortage operation. This phenomenon is often seen in the negative pressure at the inlet of the bottom valve type device, the air in the water inlet pipe and the air in the pump cavity. After the self equalizing multi-stage pump is started, the friction of the machine seal will generate high temperature during high-speed operation, which can not be cooled. Check the machine seal, the spring tension is normal, the friction surface is scorched and blackened, and the rubber is hard and cracked. Disposal method: exhaust the air in the passage and pump cavity, and replace the mechanical seal.
5. Cavitation. Cavitation mainly occurs in the heat self balancing multistage pump. Because the medium is hot water and the water temperature is too high to generate steam, the steam body in the pipeline enters the pump cavity, which cannot be removed, resulting in water shortage operation, failure of machine seal dry grinding, cavitation installation of automatic exhaust valve, and replacement of machine seal.
