Proper maintenance of BW insulation pumps is essential to ensure their longevity and optimal performance. Here are some key measures to enhance the service life of these pumps:
Firstly, always adhere to the specified procedures for pump disassembly, cleaning, and operation. This prevents unnecessary wear and tear. Research indicates that reducing the temperature in the bearing area can significantly boost the load-bearing capacity of the bearings. This means you may not need to replace high-capacity pumps; simply increasing the rotational speed can boost the output capacity of gear pumps by up to 50%. If back pressure decreases, adjust the stuffing box pressure promptly to prevent air intake. This avoids damaging the pump, which could lead to issues like stripped components, affecting pellet production and causing the pelletizer to malfunction.
Regularly monitor the temperature of the heat medium jacket, ensuring the body and front and back covers maintain consistent temperatures. Set the outlet pressure measuring point to trigger an alarm if the pressure exceeds safe limits. This precaution prevents pump damage in case of a blocked discharge line. When cleaning the pipetting system, never use the pump to transport the cleaning solution. Instead, remove and reinstall internal components post-cleaning to avoid introducing foreign objects into the pump.
Each time you increase output, record the output, rotational speed, outlet pressure, and current values. Compare these data points before and after adjustments to quickly identify any anomalies. This proactive approach aids in managing routine maintenance effectively.
In the event of a power outage or heat medium circulation interruption lasting over 30 minutes, disassemble and reassemble the pump to avoid damage from solidified and cracked melts due to poor lubrication. Regularly replace the melt filter behind the BW heat pump outlet to avoid prolonged operation under high pressure, which can strain the system.
When starting the BW heat pump, avoid blindly increasing the speed without outlet pressure. This precaution prevents premature shaft or bearing damage. Regular bearing replacements can reduce maintenance costs. Additionally, for packing shaft seal pumps, maintain a stuffing box pressure higher than external atmospheric pressure to counteract negative population pressure. Since the melt viscosity and shear rate decrease with rising temperature, the heat generated by gear extrusion and bearing friction increases melt temperature by 3 to 5°C post-pump. Lowering the heat medium temperature minimizes melt degradation.
Gradually increase the speed, avoiding sharp rises in front and rear pressures. This protects the bearings and ensures proper lubrication. If wear on the shaft or bearing inner surface approaches the hardened layer's thickness, the BW heat pump’s shaft can be reused after grinding, with only the bearing needing replacement. This extends the pump shaft's lifespan by 8 to 10 years. Lastly, the pump body’s heat medium jacket temperature should be slightly cooler than that of the front and back casings.
By following these guidelines, you can significantly enhance the durability and efficiency of BW insulation pumps, ensuring smoother operations and minimizing downtime.
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