All ambient air has a certain level of humidity.
When that air is compressed, the water in it condenses from its vapor form into a liquid state. One solution to reducing moisture in your compressed air piping system is simple: The water that results from compression is heavier than the compressed air, causing it to fall to the bottom of the compressor. Drawing air from the top of the compressor will take less moisture with it. While this can be an effective way to reduce moisture, drying air before it gets into the compressor can be a better choice. However, taking moisture out in-stream once the air is compressed requires passing your air flow through driers.
Those devices can also slow down air flow, reducing pressure. To address this issue, most compressor installers will recommend you use an aftercooler. Cooling the air as it leaves the compressor will take most of the moisture out before it gets into the piping.
The aftercooler should feed into a filter with a drain to remove the liquid from the system.
Piping Materials Guide (SA)
With an aftercooler filter, there will be considerably less moisture in your air flow immediately after leaving the compressor. Removing moisture early in the process is preferable to letting it circulate in the piping. Dryers, coolers and filters are essential elements of compressed air distribution systems. Moisture in compressed air is unavoidable, but that does not mean it is acceptable. Corrosion in a piping system can break off and accumulate into obstructions. The main restriction points in your piping occur where you have valves, connectors or devices such as dryers or sensors in the circuit.
These elements can reduce the diameter of pipe available for the air to flow through, and they also accumulate any particles in your air stream. A buildup of particulates on these devices will lower available pressure downstream and back up pressure upstream. As with dryers, it is better to have effective air filters before the compressor to take out any particles that might circulate in the piping and clog inline devices, valves and end-use nozzles.
A blockage is easy to detect: You will have excessive pressure before it and insufficient pressure after it. You can eliminate many obstructions by choosing the correct pipe materials.
Getting piping made of non-corrosive material automatically removes a large potential for obstructions. There are a lot of myths surrounding these two pipe materials. There are also pros and cons for each. These are widely used for plumbing applications but are not suitable for high-pressure systems, such as compressed air channels, because they cannot withstand the pressure. Acrylonitrile butadiene styrene ABS is a good material for piping compressed air.
You can find ABS in a variety of products, from car fenders to Lego brand toy bricks. Polyethylene PE piping is also produced specifically for compressed air systems. Another suitable plastic for compressed air pipes is high-density polyethylene HDPE. Many air compressors also require lubricating oil that can aspirate out into the air stream. Metal pipe manufacturers will tell you that plastic will degrade in compressed air applications, making them splinter, causing injury and loss of production. Plastic pipes specifically manufactured for compressed air systems come with OSHA-tested and approved cements that will hold fast for just as long as metal pipe welding.
Traditionalists prefer metal pipes for compressed air distribution systems. Just the look and feel of a metal pipe is more substantial and seems to have greater strength than its plastic equivalent. No matter how advanced engineering plastics become, some people will always feel they have greater strength and safety with metal pipes than plastic ones. There are also many benefits of metal pipes for compressed air. Given that some amount of moisture in compressed air systems is unavoidable, the newer metals — stainless steel, aluminum and copper — are more popular over the traditional galvanized and black steel piping.
However, the older metal types are still widely used in new installations even today. They are less expensive, and a large number of installation technicians recommend the materials, with which they are most familiar. Many new customers of compressed air systems are unaware of pressure-grade stainless steel, aluminum and copper pipes. This is often simply because the companies that install pressurized air systems prefer the other options. At Quincy Compressor, we combine legendary performance and reliability. We can help you plan and install a new compressed air piping system or assess your existing system.
Contact us to schedule a consultation and find out about the latest technology emerging in piping systems. You can locate a sales representative or service center near you by using our Sales and Service Locator. Quincy Compressor has been trusted in the market for nearly a century. Compressed Air Piping Systems The basics of compressed air pipework are simple.
Piping Layout Considerations When designing a compressed air piping system, you might think you should focus on the connectors. Three factors can have a more significant impact on your pressure efficiency than leaks: Sharp angles Moisture Obstructions and Blockage Sharp Angles Sharp angles in your piping system impede the speed of flow, reducing pressure. Moisture Water will corrode certain types of pipe, causing rust to flake off into the air stream. Obstructions Corrosion in a piping system can break off and accumulate into obstructions.
Plastic Pipes Plastic pipes over many benefits over metal. This, in turn, reduces the risk of obstructions. The interior surface is smooth and never deteriorates, which encourages laminar flow. The pipes are lightweight and easy to transport and fit. Cutting through plastic pipes is quick and simple and requires basic tools. Plastic pipes can be glued together, which is less costly and quicker than welding metal. Metal Pipes Traditionalists prefer metal pipes for compressed air distribution systems.
The traditional material means more installation technicians know how to fit the pipes. Steam Plant Operation, 10th Edition. Research Methods for Engineers. Structural Elements Design Manual: Handbook of Energy Engineering Calculations. Manufacturing Process Selection Handbook. Engineering Formulas for Metalcutting. Pharmaco-Imaging in Drug and Biologics Development.
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