Tips to help you reduce the use of mechanical seals for slurry pumps

Mechanical seals for slurry pumps are mainly used in coal-fired power generation flue gas slurry devices and slurry circulation pumps, and can also be used in chemical, paper and other industries. In the process flow of slurry, the medium conveyed by the pump of some stations contains particles, and some conveying medium is relatively clean, so there is a difference in the selection of sealing. For those with particles, the pump is generally required to be equipped with double-end face, back-to-back sealing form, which can effectively prevent particles from entering the sealing end face and ensure the service life of the seal. If you want the mechanical seal for slurry pump to reduce the number of failures in use, you must first select the correct type, and then master the essentials of installation and use. In order to adapt to different slurry characteristics, different types of centrifugal slurry pumps will be designed. For light abrasive slurry, a light abrasive slurry pump should be used to reduce costs and prolong the service life of the pump; for heavy abrasive slurry, a heavy abrasive slurry pump should be used. For specific selection, please refer to the manufacturer's design reference materials. Since different slurry characteristics correspond to different wear-resistant materials, different wear-resistant materials should be selected according to different slurry characteristics in the design according to the information provided by the manufacturer, so as to obtain a longer service life at a low cost. Since reducing the speed and flow of the pump is beneficial to improve the service life of the pump. The use of high-lift slurry pumps for lightly abrasive slurries to transport heavily abrasive slurries can sometimes extend life and reduce costs. This is because the head of the high-lift pump is higher at low speed, and the efficiency is more balanced. If the designed flow rate is smaller, the service life of the pump at low cost will be higher than that of the heavy abrasive slurry pump due to the extremely low speed. In the selection and design of the pump, the pump head should also be accurately calculated. Otherwise, the pump head will be too high, which will cause the pump flow to be too large, resulting in the phenomenon of evacuation, which will entrain the air and cause damage to the pump. The slurry flow rate inside is too high, reducing the service life of the pump. In addition, in the selection of the slurry pump, it is also very important to select the slurry pump of the appropriate manufacturer to ensure the high quality of the slurry pump. Slurry pump mechanical seal installation and use tips: 1. During installation, a layer of clean lubricant should be applied to the surface in contact with the seal to facilitate smooth assembly. Recommended lubricants: soapy water, silicone grease, ethylene glycol or glycerin, etc. 2. The sealing cavity of the equipment should be kept clean during installation, and the sealing parts should be cleaned to keep the sealing end face intact to prevent impurities and dust from being brought into the sealing part; 4. For easy-to-crystallize and granular media, corresponding flushing, filtering and cooling measures should be taken when the temperature of the medium is greater than 80°C. For various auxiliary devices, please refer to the relevant standards for mechanical seals; 5. Installation When the static ring gland is used, the tightening screws must be evenly stressed to ensure that the end face of the static ring is perpendicular to the shaft; 6. After installation, push the moving ring by hand, so that the moving ring can move flexibly on the shaft and has a certain elasticity; 7. Installation After turning the rotating shaft by hand, the rotating shaft should have no light or heavy feeling; 8. The equipment must be filled with medium before running to prevent the seal from being ineffective due to dry friction. The above are some tips to avoid problems in the use of mechanical seals for slurry pumps, thereby extending the service life. Have you learned them?