If you’ve ever worked in marine construction, aquaculture, or waterfront infrastructure, you’ve probably dealt with the tricky question of equipment performance in frigid temperatures. As a supplier of empty pipe floats, I get asked all the time: “Can an empty pipe float be used in cold weather?” It’s not a yes or no answer, but after 12 years of selling these floats to clients from Alaska’s Bering Sea coast to Minnesota’s frozen lakes, I can tell you it’s all about understanding how cold impacts the materials, design, and use cases of your float. Empty Pipe Float
First, let’s start with the basics: what is an empty pipe float, anyway? For anyone new to the industry, these aren’t the plastic toys you used as a kid. They’re custom-cut sections of rigid pipe—usually steel, HDPE, or aluminum—sealed at both ends, designed to provide buoyancy for things like fish farm nets, pipeline crossings, dock moorings, or debris barriers. The “empty” part is intentional; the air inside creates a consistent, predictable float, unlike foam-filled alternatives that can degrade or shift over time.
Now, cold weather’s biggest enemy for these floats isn’t the cold itself—it’s how cold affects their material properties. Let’s break this down by the most common pipe materials we use, because that’s where the rubber meets the road (or the sea ice, as it were).
HDPE (high-density polyethylene) is the most popular empty pipe float material for cold environments, and for good reason. HDPE has a lower glass transition temperature—meaning the point at which it becomes brittle—around -40°F, which is way colder than most cold weather applications we encounter. I’ve had clients in northern Canada use our HDPE floats in temperatures that dropped to -35°F without a single failure. But there’s a catch: HDPE, like all plastics, can become stiffer in cold, which makes it more prone to cracking if it’s hit by ice or a moving boat. That’s why we reinforce our HDPE floats with internal ribbing in cold-weather orders—small, cost-effective modifications that add structural integrity without sacrificing buoyancy.
Steel pipe floats, on the other hand, need a bit more care in cold. Steel becomes more brittle as temperatures drop, especially carbon steel that’s not treated for low temperatures. If you’re using a standard steel float in water that’s hovering near freezing, it’s at higher risk of cracking if it bangs against ice sheets or heavy equipment. That said, we supply cold-weather steel floats that are made with weathering steel (like Corten A) or low-carbon steel alloys that maintain flexibility down to -20°F. We also always include a corrosion-resistant coating, like epoxy, because saltwater and cold can accelerate rust—something we learned the hard way 10 years ago when a client in the Gulf of Alaska lost half their steel floats to rust after just one winter. The lesson? Cold doesn’t prevent corrosion, it can make it worse, so proper coating is non-negotiable for cold-weather use.
Aluminum is a third option, but it’s less common in very cold climates. Aluminum’s brittleness isn’t a major issue in cold, but it’s prone to cold cracking when welded improperly. If you use a well-made aluminum float with heat-treated welds, it works fine in temperatures down to -25°F, but it’s not as strong as steel or HDPE for heavy-duty uses, so most cold-weather clients stick to the other two.
Beyond materials, there’s the design of the empty pipe float itself that impacts cold-weather performance. One mistake some suppliers make is making the float too thin-walled to save money. Thin-walled pipe becomes more flexible in heat, but in cold, it’s more likely to dent or crack. Our cold-weather floats have a minimum wall thickness of 1/4 inch for HDPE and 3/16 inch for steel—enough to handle the added stress of ice movement and temperature contraction. We also seal them with extra-strong end caps, usually made of the same material as the pipe, because loose or cracked end caps let water in, which kills buoyancy and causes the float to sink. Last winter, a client in Maine tried using a cheap, competitor’s float with thin PVC end caps that cracked when the water temperature dropped, and half their debris barrier sank before they could adjust it. That’s the kind of story that makes us test every cold-weather order before it leaves our warehouse.
Another factor people overlook: the environment where you’re using the float. Are you dealing with saltwater or freshwater? Saltwater is more conductive, so it can make metal floats colder than freshwater, which increases brittleness. Ice is also a big one—if your float is going to be surrounded by seasonal ice that shifts with tides, you need a float that can absorb impact without breaking. We recently worked with a salmon farm in Prince William Sound, Alaska, that uses our HDPE floats for their net pens. The ice there can be up to 3 feet thick in winter, and the floats have to bob and flex as the ice moves. We added custom mounting brackets to their floats to distribute the force of the ice, and they haven’t had a failure in three years. By contrast, a client in a small Minnesota lake with only thin, static ice can get away with a lighter, less reinforced float—no need to overengineer if you don’t have to.
Now, what about common myths? I hear a lot of people say, “Empty floats won’t work in cold because the air inside condenses and loses buoyancy.” That’s a myth, and I can prove it. We’ve had floats in service for 15 years in northern Minnesota lakes, and every spring when we do checks for clients, the air inside is still there. The end caps are airtight, so even if the temperature drops below zero, the air inside just contracts—it doesn’t escape. The only time condensation becomes an issue is if a float’s end cap is damaged and water gets in, which is why inspecting seals before winter sets in is so important. Another myth: “Cold makes floats sink because the material gets heavier.” No—material density changes with temperature, but for HDPE, steel, or aluminum, the change is so small it’s negligible for buoyancy purposes. A 10-foot HDPE float that weighs 50 pounds at 70°F weighs 50.1 pounds at -10°F—hardly enough to make a difference when it’s displacing hundreds of pounds of water.
That’s not to say empty pipe floats are perfect for every cold-weather application. There are cases where they’re not the best choice. If you’re in an area with consistently temperatures below -40°F, HDPE becomes too brittle, and steel alloys for that extreme cold are expensive—foam-filled floats might be more cost-effective there. If you’re using the float for a permanent underwater pipeline, you might need a heavier, more rigid structure than an empty pipe can provide. But for most waterfront, aquaculture, and construction applications in temperate cold climates—anywhere from 0°F to -35°F—empty pipe floats work just as well as they do in summer, if you choose the right material and design.
I also want to talk about maintenance, because that’s half the battle with cold-weather float performance. We always tell our clients three things to keep their floats working in winter. First, inspect end caps and seals in late fall before the water freezes. A small crack in September can turn into a big break by January when the temperature plummets. Second, if you’re using steel floats, touch up any chipped coating before winter—salt and moisture in cold air will eat through bare metal fast. Third, if you have floats that are tied to moorings, make sure the mooring lines are long enough to handle ice buildup. Ice can add a lot of weight, and a line that’s too short will pull the float under. We had a client in Washington state last winter who didn’t adjust their mooring lines, and a heavy ice load pulled three of their steel floats under. It was a $12,000 mistake that could have been avoided with a 2-foot extra length of line.
Over the years, we’ve learned that cold-weather use of empty pipe floats isn’t about avoiding cold—it’s about planning for it. When we get an order from a client in North Dakota, we don’t just send a standard float. We ask: What’s the lowest temperature you expect? Is the water salt or fresh? Will the float be exposed to ice movement? Do you need it for a temporary project or permanent installation? Those questions let us adjust the material thickness, add reinforcement, or recommend a different material entirely. For example, a client in Alaska’s Kodiak Island ordered steel floats for a pipeline crossing last year, but after we asked about ice conditions, we upgraded them to low-carbon, cold-rolled steel that can handle impacts from icebergs. They’re halfway through the winter now, and they haven’t had any issues.
I’ve talked to enough suppliers who cut corners on cold-weather floats to know that the wrong product can lead to costly downtime. A fisherman whose net pens sink in mid-winter loses thousands of dollars in fish; a construction company whose pipeline floats fail mid-project faces delays that eat into their budget. That’s why at our company, every cold-weather float we ship is tested to withstand a 50-pound impact at 0°F before it leaves our warehouse. It’s an extra step, but it’s saved our clients from a lot of headaches.
So, to circle back to the original question: Can an empty pipe float be used in cold weather? The answer is a resounding yes—if you choose the right material, design it for the specific cold environment, and maintain it properly. It’s not a one-size-fits-all solution, but for most applications in areas with extreme winters, empty pipe floats offer a durable, cost-effective option that outperforms foam-filled or wooden alternatives. Wooden floats rot in cold, damp conditions; foam-filled floats can tear or lose buoyancy when exposed to ice and UV rays over time. Our empty pipe floats often last 10, 15, even 20 years in cold climates if cared for right, which makes them a smart long-term investment.
If you’re planning a project in a cold climate and need reliable empty pipe floats, or if you’ve had bad experiences with floats failing in winter, I encourage you to reach out to our team. We’ve worked with hundreds of clients across North America, and we can help you specify the right float for your needs, answer any questions about cold-weather performance, or even provide custom modifications for unique applications. Whether you’re setting up an aquaculture farm in Maine, building a waterfront structure in Manitoba, or maintaining a debris barrier in the Great Lakes, we have the experience and products to keep your project on track through the coldest months.
Floating Barrier References
ASTM International. Standard Specification for High-Density Polyethylene (HDPE) Pipe and Fittings for Pressure Applications. ASTM D3350-22.
National Marine Manufacturers Association. Cold Weather Equipment Performance Guidelines for Recreational and Commercial Watercraft. NMMA CWG-19.
U.S. Army Corps of Engineers. Cold Regions Engineering Manual: Design of Floating Structures. EM 1110-2-2907.
Shandong Xincheng Pipe Co., Ltd.
Shandong Xincheng Pipe Co., Ltd. is one of the leading empty pipe float manufacturers and suppliers in China. We warmly welcome you to buy high quality empty pipe float in stock here and get free sample from our factory. Contact us for customized service.
Address: NO.45,104 GuoDao Road, Economic Development Zone, WeiShan County, JiNing, ShanDong, China
E-mail: sales@zhongtianplastic.com
WebSite: https://www.sdxcplastic.com/
