-
Product
-
-
Service Policy
-
-
Blog
-
Join Us
Service Support
Always adhere to providing customers with professional technical solutions and high-quality service experiences
Maintenance methods for multistage split-case pumps—easy to understand at a glance.
Maintenance methods for multistage split-case pumps—easy to understand at a glance.
For those who have been with... Multi-stage split-case pump For the skilled technicians who work with this equipment, the core of maintenance comes down to just two words: “frequent checks” + “smart utilization.” By taking advantage of its open-design and easy-open lid, you can avoid major disassembly and repairs. By proactively identifying and addressing minor issues early on, you can significantly reduce the likelihood of major breakdowns. Next, let me clearly share with you some practical maintenance methods—these are all valuable, hands-on tips that you’ll actually find useful in your daily work.
I. Daily Inspections: Spend 10 minutes each day to detect potential hazards early.
Daily maintenance doesn’t require complicated procedures—just focus on these three key aspects: looking, listening, and touching. Simply pay extra attention during your daily inspections.
First, listen to the sound: Under normal operation, you should hear a smooth humming noise. If you notice a thudding impact sound or a sharp grinding noise, immediately stop the machine and perform an inspection. Most likely, the impeller is worn, the bearings are loose, or a foreign object has fallen into the pump.
Next, let’s take a look at the equipment’s condition: First, check for vibrations—make sure the pump body and motor aren’t shaking excessively. If they are, it could mean that the base bolts have come loose or the coupling isn’t properly aligned. Second, inspect the seals: A slight drip from a mechanical seal (no more than 5 drops per minute) is acceptable; if the leakage increases beyond this level, it’s time to replace the sealing element. For packing seals, a slight drip is perfectly fine—tightening them too much can wear out the shaft sleeve, while loosening them too much will result in excessive leakage.
Finally, check the parameters: Note down the inlet and outlet pressures and flow rates, and compare them with the rated values. If the pressure drops suddenly, it could indicate that the impeller is blocked or worn out. Also, keep an eye on the bearing temperatures: rolling bearings should not exceed 75℃, and sliding bearings should not exceed 65℃. If a bearing feels scaldingly hot, first check whether it’s lacking lubrication.
[For more information on multi-stage double-suction pump models, specifications, selection and quotation options, please click the image above to learn more.]
II. Regular Maintenance: Follow a scheduled cycle—no need for major disassembly and overhaul.
The most hassle-free feature of multistage split-case pumps is their split-case design—no need to disassemble pipes or motors. You can simply lift off the upper pump cover to inspect the core components, and then follow the maintenance schedule below for efficient and effortless upkeep.
Weekly: Clean the pump’s surface and the inlet and outlet filters to prevent debris from clogging them. Also, check whether there’s enough lubricating oil—ensure the oil level stays between half and two-thirds of the oil sight glass.
Monthly: Replace the lubricating oil once a month. For a new pump, the first run requires an oil change after 500 hours; thereafter, change the oil every 2,000 hours, using the model recommended in the instruction manual. Open the upper pump cover and check whether the impeller and guide vanes are worn or scaled. If there is scaling, flush them with high-pressure water.
Every quarter: Check the bearing clearance—if the clearance is too large, replace the bearings; calibrate the coupling’s coaxiality—misalignment can easily cause vibration; inspect the balance disc and balance drum for excessive wear—if they’re worn out, it could lead to axial movement of the pump shaft, affecting the head.
Annually: Perform a comprehensive disassembly and inspection, replacing all aged seals and O-rings. Measure the wear on the impeller and pump shaft; if the wear exceeds the specified limits, repair or replace these components. For pumps handling corrosive media, also apply an anti-rust treatment to the inner walls of the pump casing.
3. Troubleshooting: Safety first—don’t overlook the details.
If a real overhaul is in order, first make sure safety measures are fully in place: You must disconnect the power, relieve pressure, drain the medium from the pump, and hang up a warning sign to prevent anyone from accidentally starting it up.
When opening the cover, be careful: when removing the bolts from the pump cover, apply even pressure symmetrically—don't twist the pump cover out of shape. When reassembling, apply a layer of sealant to the sealing surface, and tighten the bolts in a diagonal sequence to prevent leaks.
When replacing wear parts such as impellers and bearings, try to use genuine factory parts to ensure proper size compatibility. When replacing multi-stage impellers, be absolutely careful not to install them backward—otherwise, the head will drop significantly.
4. Long-term shutdown: Don't just leave it unattended—make sure to properly seal it up.
If the machine is shut down for more than 15 days, don't just leave it unattended: First, drain the medium from the pump, then flush the flow passages and impeller thoroughly with clean water to prevent scaling and corrosion. For metal contact surfaces such as shaft journals and sealing surfaces, apply a layer of rust-preventive oil. You can also coat the inside of the pump casing with an anti-corrosion paint.
After that, manually turn the pump shaft 1-2 revolutions each month to prevent the shaft and bearings from sticking together. If the pump is left idle for more than six months, disassemble the bearings and store them separately for maintenance; otherwise, they’re likely to get damaged.
Actually, maintaining a multistage split-case pump isn't difficult at all. The key is to take full advantage of its easy-open design—regularly inspect it and address minor issues promptly. By avoiding major overhauls and disassemblies, you can keep the pump running smoothly and minimize breakdowns.
Related News
Hotline:
+86 0731-88632200
Export Trade/Technical Support:
+86 153-4831-2290
Head Office Email:
zoomlian@yeah.net
No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor
Quick Navigation
Hot Products
Online Consultation
Powered by:www.300.cn Changsha SEO