Severe oil leakage from the mechanical seal
Thread Content
Our factory has a crude oil pump that leaks oil severely during operation. The mechanical seal has been replaced multiple times, and the pump has also been repaired several times, yet the cause of the leakage has not been identified. Moreover, the oil starts leaking as soon as the inlet valve is opened, even without starting the pump. What could be the reason? Everyone was very tired from disassembling the pump so many times; those with experience left me messages
Check the sealing rings of the pump and impeller. Check whether the shaft is bent
Check whether the compression amount is too low, whether the O-ring is too loose or too tight, and whether the quality of the mechanical seal itself is poor :)
Check where the leakage is coming from; first rule out the possibility of leakage from the static ring gland. If the leakage occurs along the axis, start by examining the various static and dynamic sealing points of the mechanical seal, 1. Is the wave damaged (if there is a bellows)? Kerosene leak test, 2. Is there an internal leak between the sleeve and the shaft, or is it a leakage in the static seal between the rotating ring and the sleeve? 3. Is there a leak at the static ring and the static ring seat? 4. Is it leaking from the friction surface, due to damage on the surface or because the compression amount is too low? If all are denied, 5. Whether the machine seal selection is appropriate and whether it can handle the crude oil medium under the required operating conditions, 6. Check whether the installed pipes are connected incorrectly by checking for leaks from the cooling water holes or flushing holes.
The concentration is relatively high; it is recommended to use a packing seal instead
Determine whether it is the mechanical seal that is leaking oil or the shaft sleeve of the mechanical seal ?
If leakage occurs at static pressure, the following aspects should be checked: 1. Is the compression amount low (sometimes there is apparent compression)； 2. Is there a problem with the static ring seal (too large, too small, or poor surface finish)? ； 3. Are there any issues with the shaft sleeve seal ring (it may be damaged during installation or there may be size problems). 4. Is there any issue with the flatness of the stationary and rotating rings (check this using instruments) ； 5. If it is a cantilever pump, there may be an issue with the spare gasket or the impeller (I have encountered similar problems).
The cause has finally been identified; it turns out that the hole for oil flushing wasn’t sealed.
Ugh, speechless! That’s often the case with equipment – the details aren’t taken care of properly, and when we think about things, we tend to complicate the simple ones! Let’s encourage one another, everyone in the equipment field must pay attention to the details!
Check the sealing rings of the pump and impeller. Check whether the shaft is bent
Scope of laser processing services: 1. Laser heat treatment technology. Laser heat treatment is a high-tech method for rapid local surface quenching, which is primarily used to strengthen the surface of components. It can increase the surface hardness, wear resistance, strength, and high-temperature resistance of metal materials and parts, while allowing the core of the parts to retain good toughness. As a result, the mechanical properties of these parts feature excellent wear resistance, high impact toughness, and high fatigue strength. The use of laser heat treatment technology can significantly improve product quality and double the service life of products. Laser heat treatment has significant advantages over traditional quenching processes: the surface hardened layer has a fine and uniform structure, is not restricted by the shape of the part, can achieve a hardness of up to HRC60, and its thickness can reach up to 4 MM. 2. Laser cladding technology: A laser-based process that deposits a layer of material with specific physical properties on the surface of a selected workpiece, in order to improve its surface properties or restore the original geometric dimensions of the part. High-performance materials can be used optionally to modify the substrate surface, resulting in a cladding structure that is fine-grained, free of microdefects, and features high metallurgical bonding strength. Laser cladding technology can also be used to repair holes and cracks on the surface of materials, restoring the geometric dimensions, morphology, and properties of damaged workpieces. 3. The application of laser processing technology imposes no restrictions on the geometric dimensions of mechanical parts’ shapes; laser processing can be carried out wherever the laser can reach ； There are no restrictions on the base material; steel, iron, non-ferrous metals, and certain types of cemented carbides can all be repaired ； It can modify the metal surface, enhancing the physical properties of parts such as wear resistance, corrosion resistance, and heat resistance, thereby extending the service life of these parts and reducing production costs. 15036091152 QQ939430841 Zhengzhou Guanggu Laser Technology Business Department