That’s a certain type of winter fear unrelated to snow. You go outside from warmth of your house, you grab the door knob, and your hand fuses to the door. Or you get in your car and there’s no air hose at all; just a steel bar that won’t bend or flex an inch.
You twist it and tug on it and then, crack!. You hear that sound, immediately wishing you hadn’t done that. Suddenly, the air tool in your hand feel like it weighs a ton, and what was going to be a weekend project has become a class in material science.
From the pro mechanic tinkering with his diesel engine to the weekend homeowner installing drywall in the basement, this happen to us all. It’s like our expensive tools is failing us and there must be something wrong with them. But freezing air lines aren’t typically a product failure.
They’re more of a physics problem than anything related to maintenance. Knowing what causes the line to turn into a plastic brick in subzero temps will prevent you from having to buy a new hose each year. It will also ensure your impact wrench keep working while the shop freezes up.
Understanding Why Air Hoses Freeze in Winter
Why Air Hoses Freeze and Become Brittle
Normally the hose is the problem. Standard air hoses are typically made from a rubber compound (a type of plastic) mixed with some sort of fabric fiber to reinforce the strength. Rubber has something called a glass transition temperature.
Below this temperature the rubber polymer chains no longer flexes. Instead they become fixed in place. A hose doesn’t actually freeze, like water, but instead becomes glassy.
That’s what happens when you take a rubber hose that was pliable down around 50 degrees and make it feel like a cable at ten degrees. It just went past its temperature limit. First cheap hoses break.
That’s because cheaper hoses is made from lighter weight material (thinner wall) or have a lower grade of rubber. Those type are meant for light duty, and warm weather only. They don’t contain the right blend of synthetics that give them flexibility in cold temperatures.
Using cheap winter hoses means fighting the hose material itself. It’s not going to end well, and I guarantee you’ll crack them before completing your task. The cost savings you realize now are canceled out by busted hoses and wasted effort later in the year.
Choosing Cold Weather Resistant Hose Materials
Quality counts When it comes to hoses, those made of reinforced thermoplastic polyurethane (TPU) and/or synthetic rubber is much better in cold weather. In fact, the TPU handles very cold temperatures very well, as it will still flex even when the temperature is well-below freezing. Additionally, it resists chemicals and abrasion more better than other types of hose.
For use with air tools outside, seek out hoses rated for low-temperature service. Porter-Cable and Campbell Hausfeld have lines of winter-rated hoses that stay flexible. They’re pricier, but they’ll last longer.
Worth it. Flexibility, after all, costs money. Moisture in the line adds to the issue.
Removing Moisture to Prevent Internal Freezing
Air has water vapor in it, especially compressed air. When that air comes out of the compressor and flows down your hose, it cools and the water vapor turns back into water… Liquid water.
If it’s still fairly warm outside, that water leaves the tool or drains from the drain valve. If it’s cold outside, however, it may actualy freeze in the tool or even in the hose. And remember what happens when ice forms?
It expand. That expansion can destroy internal valves and seals. Or it can form plugs that block airflow.
Your tool runs sluggish, maybe it doesn’t run at all. You see full pressure on the air pressure gauge but no response from the tool. That is a common frustration for mechanics who rely on pneumatic wrenches.
In this case, an air filter is mandatory. Before the air enters your hose, a good in-line filter eliminates particles and moisture that could freeze inside the line. Look for ones with automatic drain valves.
These valve push out any collected water without operator assistance. After the filter, you might also want to use an oiler. Modern tools tend to be oil free.
But adding a drop of oil into the line can help lubricate seals and keep them from drying out during the cold months. Lubrication combined with filtration helps protect your equipment. Proper storage is important, and how you hang your hose matters too.
Proper Storage and Handling Techniques
Storing it wound too tightly in the back of the truck or a cold garage will speed up the stiffening process. The tight coil create stress points. Once the material gets brittle, cracks begin to form at these points.
Always hang your hose loosely coiled on a rack. Avoid making sharp bends in it. When storing outside, use an insulated hose cover.
This inexpensive piece of equipment gives you some protection from the elements. It keeps your hose warmer for a bit longer which buys you some time until that material freezes. One easy tip: pre-heat the hose.
Give the hose a minute or two with the airflow running before starting your work. Air expanding and moving past itself in that way creates a little bit of heat. It is not enough to melt ice, but it may be just enough to loosen up a stiff hose.
Another option is to quickly pass the hose under some warm water. Don’t use hot water or an open flame; that will cook the reinforcement inside the hose. Gently warming is good; aggressively heating is bad.
Tips for Using Pneumatic Tools in Winter
Keep air flowing. Air moves slower and is denser when it’s cold. Both the condition of the hose and the air density will impact how well tools performs.
Use short hoses whenever possible. Long lines freeze easier and drop more pressure. If you can, run your compressor inside a warm area.
Then run the hose from there to the work area. Why? That keeps the source warm.
This reduces the length of hose outside in the cold. It is a small adjustment, but it brings significant results. Testing your preparedness: It’s winter; it’s air work.
You can’t make the weather cooperate, but you can prepare your equipment for success. What do I mean? Select the appropriate hose material Store the line correctly.
These measures go a long way in preventing the headache of a frozen line. They ensure that your tools is ready to work when you need them most. The next time you’re faced with a cold day, don’t forget: your hose is nothing more than a channel.
Care for it accordingly. Maintain its flexibility. And what you’ll discover is that the winter chill isn’t as scary as it may seem at first glance.
Your air line won’t be an obstacle, it’ll be a tool.
