Scuba divers has their own type of anxiety when they check pressure gauge on their scuba tanks prior to diving. It is there and it have air in it, but not all air from compressors are the same. Some machines will dispence clean dry breathable air and some add particulates, oil, moisture or other contaminants that can not only ruin your gear but your lungs as well.
It isn’t just about how fast it reach three thousand pounds per square inch. It is about knowing that every time you breathe deeply, you are getting a clean, uncontaminated breath of air that won’t end your day… Or worse.
There is plenty of choices on the market, whether it’s an inexpensive automotive inflator or a full-on industrial grade recertification station. Often, it boils down to duty cycles and filtration system. Some fill quickly, but they can overheats and fail.
Others take longer, yet still leave you stranded with a half-filled tank. So you’re looking for something somewhere in-between, which will work without costing too much money and also won’t require a mechanical engineer to keep running. Deciding between a two-stage and single-stage compressor are your first big purchase.
How to Choose the Right Scuba Air Compressor
Choosing Between Single and Two-Stage Compressors
What do you want? Do you want to buy a simple unit that quietly fill your small tank or a more complicated compressor that can quickly get your big tank up to pressure? Single-stage compressors sucks in air, compress it once, and then shoot it straight to the tank.
Good for occasional divers or people who don’t dive much. They is inexpensive. Quieter.
But they are typically not as powerful than. It can take several cycles to top off a big tank. The two-stage compressor work in two stages.
It pulls in air, compress it once, and sends it to an intercooler which reduces the temperature of the compressed air. Because it’s cool, it’s dry and more efficienter. This allows it to compress again on second stage.
It is a more complicated piece of equipment, but it fill faster with cleaner air. The importance of filtering your air cannot be understated. Water and oil aren’t good for breathing in and normal compressed air have both.
Importance of Filtration and Drying Systems
When selecting an air compressor look for one that incorporate a pre-filter, followed by a charcoal filter then a desiccant dryer. These stages removes moisture, odors and hydrocarbons as well as larger particulates. Companies like Bobby Garland make their name on strong filtration stages with multiple carbon bed to keep the air extremely pure.
A single drying stage is critical. Without this, you don’t want to fill any type of tank meant to hold breathable air. Why?
Moisture cause bacteria growth and rust inside the tank and we don’t need those issues when fishing. A compressor’s duty cycle refer to its ability to run continuously versus cooling off. If a compressor has a fifty percent duty cycle it means that it may operate for thirty minutes and will require a half hour of cooling down.
Understanding Duty Cycle Requirements
This become critical if you’re filling large cylinders or multiple tank. There are industrial units by manufacturers such as Kaeser or Atlas Copco that is made to be run continuously, but cost an arm and a leg. Most recreational divers don’t need anything more than a unit in the sixty to seventy-five percent duty cycle range.
That way you can fill two or three tanks back-to-back and not overheat the compressor. Check manufacturer specs for maximum run time at full charge. One other functional factor is noise…
Managing Noise and Vibration
Particularly if you’re filling your tanks outside in a back yard or garage. High-pressure compressors will be loud; they has to be. But manufacturers today use vibration dampeners and sound enclosures to reduce decibels.
There are even some that come with steel cabinets that do a great job of muffling all that mechanical noise. They’re never silent, but the quieter the compressor, the easier it is to fill and the less annoying it is for those around you. A little quality of life improvement, but it counts when you’re sitting there for an hour watching the pressure rise.
Not all compressors are created equal. Some are very low maintenance; they’re sealed systems that do not require much attention. Others requires filters replaced and oil changed regularly.
Maintenance and Safety Best Practices
Purchase your compressor from a brand that has replaceable filters, and make sure you always have replacement cartridges on hand. Clogged filter result in inefficiency and danger when running your compressor. Remember: Think of the air pathway as the respiratory system.
Keep it clean and dry, and change the filters when they need to be changed. If you don’t maintain it, a safe tool will became a liability. In conclusion, the best compressor is whichever compressor you can afford that most importantly prioritizes quality of the air output.
Clean air is needed; speed is nice. Get a unit that will cool the air well and filter the air well. Don’t skimp on the drying part because moisture is the enemy of your equipment and your lungs.
If you see that gauge again, you’ll be glad you invested in something that gives you the peace of mind that you’re breathing the purest air possible. It’s worth every penny.
