A condensate drain is a necessary component of a compressed air system because it disposes of potentially harmful condensates in a safe way. Condensates form from the cooling of moisture in the air system, and must be drained properly and regularly. If the condensate is not drained, water vapor and other contaminants would not be properly removed via refrigerated air dryers or mist eliminators. These drains are categorized into zero air loss drains and timed electric drain traps.
Zero air loss drains operate automatically via pneumatic power and waste no compressed air when they discharge condensate. These condensates are continuously measured by ultrasonic sensing technology systems, allowing for constant monitoring of the process. The discharge from these drains can be executed at a rate of up to 60 gallons of condensate per hour. The state of the condensate is irrelevant and, as such, it can be dirty, emulsified, or clean. Regardless of the state it is in, all condensate is discharged through this process. Zero air loss drains expel no compressed air, hence the term “zero air loss”. Once a predetermined amount of condensate has accumulated in a reservoir, the drain discharges the condensate safely and efficiently.
The second type of condensate drains are timed electric drains. These drains are programmed to drain condensates at specific time intervals, and are designed to discharge condensates at pressure ratings as high as 720psi. External knobs adjust the open time and duration between cycles, while valve-open lights display operating conditions. A motorized ball valve is also used for the timing of these electric drains.
The third type of condensate drains are automatic drain traps, also known as float drains. These drains operate without electricity and are used to discharge both clean and heavy emulsion condensates. These automatic drain traps are relatively compact in size and operate automatically, saving both space and energy costs.
After the drains have discharged the condensate, oil and water separators are used to reduce hazardous waste in these condensates. Oil and water separators work by siphoning out materials such as mineral oils, semi-synthetic lubricants, synthetic lubricants, 24KT fluids, and polyglycols from the compressed air. Because oil and water mixtures are not safe to release back into the environment, the lubricants are trapped in these systems, allowing water to pass through.
All these drains are used in compressed air systems to keep the air free of water vapor and other contaminants. Draining condensates is one of the most important aspects when dealing with industrial air compressor maintenance. Not only will a well drained system function more smoothly, but it will also save you valuable time and money.