If you’ve ever ordered a self-balancing multistage pump for a commercial building, water treatment plant, or industrial process, you might think that once it leaves our warehouse, the hard part is over. But as a supplier who’s spent the last 12 years troubleshooting pump storage issues for clients across North America and Europe, I can tell you that even a brand-new, high-quality self-balancing multistage pump can fail before it’s ever turned on if it’s stored incorrectly. I’ve seen pumps rust at the flanges, seal faces get pitted by humidity, and motor windings degrade so much that they don’t work after installation—all because someone forgot to follow basic storage protocols. Today, I want to break down exactly what goes into proper storage for these pumps, based on our team’s real-world experience and the industry standards we rely on every day. Self-balancing Multistage Pump
First, let’s start with the basics: what makes self-balancing multistage pumps different from other types, and why their storage needs are unique. Unlike single-stage pumps, which are simpler, these units have multiple impellers stacked along a single shaft, designed to handle high pressure for long runs. The self-balancing feature means they have a thrust compensation system that eliminates the axial forces that can damage other multistage pumps, but that also means there are more delicate components to protect: the seal chamber, the balance drum (or disc), the motor stator, and the precision-machined impeller eyes. Cut corners on storage, and those parts will be damaged before you even connect the pump to a pipe.
Let’s start with the most critical factor: environment control. Self-balancing multistage pumps should never be stored in an unconditioned space. I learned this lesson early in my career when we delivered 12 pumps to a municipal water plant in a small town that had a makeshift storage shed with no heating or insulation. That winter, temperatures dropped to -10°F (-23°C), and the pumps’ internal water lines (we test every pump with clean water before shipping, per industry standards) froze, cracking the impeller casings and ruining the seals. It took us three weeks to replace those units, delaying the plant’s new system by a month and costing both sides in overtime. So, number one rule: store pumps in a climate-controlled space where the temperature stays between 40°F and 100°F (4°C and 38°C). That range prevents condensation, which is the number one enemy of pump components.
Condensation is such a big issue because it leads to rust and corrosion, which eat away at precision surfaces. Even if a pump is wrapped in plastic, if the storage space has high humidity, moisture can get trapped inside the unit. Our team always recommends two things for moisture control: first, use desiccant bags rated for the size of the pump, and seal the entire unit in a heavy-gauge polyethylene shrink wrap, not just regular plastic sheeting. Second, use a dehumidifier in the storage space to keep relative humidity below 60%. I’ve had clients tell me they skipped the shrink wrap and just used tarps, only to find rust spots on the pump’s base a few months later—tarps let in moisture from the ground or air, which plastic doesn’t (as long as it’s properly sealed).
Next, handling the pump’s internal components during storage. A self-balancing multistage pump’s shaft and impellers are precision-machined, so they can’t sit in a tilted position or be stacked on top of other heavy equipment. We always advise clients to store pumps horizontally, on a flat, sturdy wooden pallet (never metal, which can conduct moisture and scratch the pump’s base). The pump should be secured with straps so it doesn’t slide or shift, and we recommend placing a layer of foam between the pump and the pallet to prevent scratches to the painted casing. I once worked with a construction company that stacked two pumps on top of each other in a warehouse, and the top pump’s outlet flange bent because the bottom one’s casing wasn’t strong enough to support the weight. That bend made the pump impossible to install without major modifications, and we had to replace the flange at no extra cost—something we avoided with all subsequent client communications about storage.
For the pump’s motor, which is often attached directly to the multistage unit, there are additional steps. Motor windings are made of copper wire, which can degrade if they’re exposed to dust or moisture, especially during long-term storage (more than three months). We always recommend checking the winding resistance every 30 days if the pump is in storage for an extended period, and if it drops below the manufacturer’s specified level (usually around 1 megaohm at 500V), you need to dry the windings before installation. Another tip for motors: if the pump will be stored for longer than six months, remove the terminal box cover and apply a light coat of anti-corrosion grease to the exposed connections. I’ve seen motors that sat in storage for a year go bad because the terminal connections corroded, so that small step saves a lot of hassle.
Seals are another delicate part of self-balancing multistage pumps. Most of these pumps use mechanical seals, which have two precision-machined faces that need to stay lubricated and free of damage during storage. Never remove the seal’s protective plugs from the seal chamber—those are there to keep dirt, moisture, and dust out. If the plug is lost, you can wrap the seal area in a clean, lint-free cloth, but don’t use oil or grease on the seal faces, because that can attract dirt that will scratch them later. We had a client once who thought coating the seal would keep it from drying out, and when they installed the pump, the seal leaked within a week because the grease had hardened and left a gap between the two faces. That’s a mistake we now explicitly list in our storage guidelines that we send with every pump.
Then there’s the issue of rotating the pump shaft. Even when it’s not in operation, the shaft of a multistage pump can develop “flat spots” on the bearings if it sits in one position for too long. That’s because the bearings are under constant pressure from the weight of the shaft and impellers, and leaving it stationary for months can cause uneven wear. Our recommendation is to rotate the shaft by hand one full turn every two weeks if the pump is in short-term storage (less than three months), and every week if it’s in long-term storage. We also advise doing this at the same temperature each time, to avoid thermal expansion issues. Once, a food processing plant stored a pump for four months without rotating the shaft, and when they tried to run it, it made a loud grinding noise from the bearing flat spot. We had to replace the bearings on site, which cost the plant thousands in downtime. That’s a preventable issue that’s easy to skip, but it makes a huge difference.
What about if the pump has already had its internal parts cleaned before storage? Our company always performs a final flush with distilled water after testing every pump, but if a client needs to store a pump that’s been used (for example, a spare pump for their facility), there are extra steps. They need to drain all internal water completely—even from the smallest passages in the multistage casings. We use compressed air to blow out every line, and then add a non-toxic, anti-corrosion pump storage fluid to all wetted parts. That fluid creates a protective barrier on the impellers, casings, and shaft, preventing rust even in high-humidity environments. We always warn clients not to use motor oil for this—motor oil is too thick and can leave residue that gets trapped when the pump is run, leading to clogs or damage.
Now, let’s talk about the common mistakes we see clients make that lead to storage issues. First, storing pumps outside, even for a short time. Even if it’s covered by a tarp, UV rays can degrade the plastic wrap, and rain or snow can seep in. I’ve had a client store a pump outside for two weeks while waiting for their new building to be finished, and by the time they brought it inside, there was rust on the base and the impeller eyes. Second, not labeling the pump’s components. A lot of clients will remove the protective plugs and forget which ones go where, leading to damaged parts during installation. Third, storing the pump near chemicals or other corrosive materials. Even if the pump is sealed, fumes from cleaning agents or industrial chemicals can penetrate the plastic and damage the motor or seals. We always advise storing pumps at least 20 feet away from any chemical storage areas.
Finally, a few final tips to make storage easier and less risky. First, keep all original packaging and documentation. The shrink wrap, wooden pallet, and protective plugs are all designed specifically for your pump—don’t throw them away until the pump is installed and running. Second, create a storage log. Write down the date the pump was stored, the temperature and humidity levels at the time of storage, when you rotated the shaft, and any checks you did on the windings or seals. That way, if something goes wrong during installation, you can go back and see if it was a storage issue. Third, if you’re unsure about any part of the storage process, reach out to us. As a manufacturer and supplier, we have a team of technical experts who can walk you through every step, whether you’re storing one pump for a small office building or a dozen for a major industrial plant.
At the end of the day, proper storage for self-balancing multistage pumps isn’t just about following rules—it’s about protecting an investment that can last 20+ years when cared for properly. I’ve seen how a little extra time spent getting storage right saves our clients thousands in replacement costs and downtime, and I’ve seen the opposite too. If you’re in the market for a self-balancing multistage pump and need advice on storage requirements before you take delivery, or if you have questions about our pumps’ specific storage guidelines, don’t hesitate to connect with our team. We’re here to help every step of the way, from selecting the right pump for your application to making sure it works as well as possible when you need it.
If you have further questions about storage, installation, or maintenance for your self-balancing multistage pump, please feel free to reach out to our team for a consultation.
Multistage Centrifugal Pump References:
Hydraulic Institute. Pump Storage and Preservation Guidelines. Hydraulic Institute, 2020.
American Petroleum Institute. API Standard 610: Rotary Pumps for Petroleum, Heavy Chemical, and Gas Industry. 11th ed., API, 2010.
National Electrical Manufacturers Association. NEMA Standard MG 1: Motors and Generators. NEMA, 2018.
Hunan Sanchang Pump Co., Ltd.
Hunan Sanchang Pump Co., Ltd. is one of the most reliable self-balancing multistage pump manufacturers and suppliers in China, also supports customized service and OEM&ODM service. Welcome to buy CE certified self-balancing multistage pump made in China here and get pricelist from our factory. For price consultation, contact us.
Address: No.517, Xiangfu East Road, Yuhua District, Changsha City Hunan
E-mail: info@sanchangpump.net
WebSite: https://www.sanchangpump.net/
