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Air Receiver Tanks for Waste Recycling Plants
Compressed air demand in waste recycling plants can be difficult to manage because it rarely stays consistent. A sorting line may operate at relatively modest consumption for much of the time, then several pneumatic ejectors, gates or cylinders operate together, and demand rises sharply for a few seconds. Add a baler or another high-volume pneumatic function and system pressure can fall quickly.
An air receiver provides stored compressed air to support these short peaks. Correctly sized and positioned, it can improve pressure stability, reduce unnecessary compressor cycling and help pneumatic equipment respond consistently when several processes operate together.
The important point is that not every pressure problem is a storage problem. An undersized compressor, restrictive distribution pipework, dirty filters, incorrectly sized regulators and air leakage can produce similar symptoms. Increasing receiver capacity without establishing the cause can therefore result in a larger vessel without solving the production problem.
At Fluid-Air Components, we approach receiver selection by looking at how the compressed air system behaves under actual plant demand. That is particularly important in recycling facilities, where intermittent loads can make average air consumption figures misleading.
Why Recycling Plants Put Particular Demands on Compressed Air Systems
Compressed air can support sorting equipment, pneumatic ejectors and diverters, gates, cylinders, automated valves, balers, compactors and other material handling equipment. These applications do not necessarily consume air in the same way.
A large cylinder operating occasionally creates a short but significant demand. Sorting equipment may use smaller volumes repeatedly and at high speed. Several processes operating together can create a peak substantially above the plant’s average consumption.
That distinction matters when diagnosing low pressure.
A compressor might have enough capacity to satisfy average consumption over a production shift but still struggle with a sudden peak. Pressure falls while the equipment operates, then recovers once demand reduces. That behaviour is quite different from a compressor that remains fully loaded while pressure progressively falls because total plant consumption exceeds its output.
The first situation may point towards insufficient storage or restricted distribution. The second is more likely to require attention to compressor capacity, excessive consumption or leakage.
Understanding which is happening should come before choosing another receiver.
How Should an Air Receiver Be Sized for a Recycling Plant?
Rules based on receiver litres per kW of compressor power can provide a rough starting point, but they are not enough for a recycling facility with significant intermittent loads.
Compressor free air delivery is more useful than motor power alone. From there, receiver sizing should consider:
- normal and maximum system pressure;
- minimum acceptable pressure at the equipment;
- existing receiver capacity;
- compressor control arrangement;
- normal compressed air consumption;
- peak demand;
- duration and frequency of peak demand;
- whether high-consumption machines operate simultaneously;
- time available for the receiver to recover between cycles.
Imagine a plant where the compressor comfortably supports normal production, but pressure falls for 15 seconds whenever a baler operates at the same time as the sorting line. If the compressor can replenish the air used before the next baler cycle, additional storage may be a sensible solution.
If the baler repeats the cycle so frequently that system pressure never recovers, a larger receiver becomes progressively less useful. The plant is consuming air faster than it can be replaced.
Central Receiver or Local Storage?
One large receiver in the compressor room is not always the best way to deal with intermittent demand across a large recycling plant.
The primary receiver provides storage for the overall system, but high-demand equipment positioned a considerable distance away may benefit from secondary storage closer to the point of use.
A remote baler is a good example. If it requires a substantial volume of air over a short cycle, a local receiver can supply part of that demand without requiring the complete instantaneous flow to travel through a long distribution main. The receiver is then replenished between cycles.
The same principle can apply to sorting equipment or other pneumatic machinery added during a plant expansion.
Local storage is not a substitute for badly undersized pipework, though. The supply line still needs sufficient capacity to recharge the receiver, while connections between the local receiver and the equipment must be capable of delivering the required flow.
The question is therefore not simply how many litres of storage the plant has. It is whether sufficient air is available where it is needed and quickly enough to maintain operating pressure.
Condensate Management Matters
An air receiver is also a point where compressed air cools and moisture can condense. That water needs somewhere to go.
Allowing condensate to accumulate inside the vessel reduces available volume and can contribute to internal corrosion. Water may also be carried downstream, increasing the burden on treatment equipment and potentially affecting pneumatic components.
Manual drains can be perfectly adequate where the receiver is accessible, and drainage is genuinely incorporated into routine maintenance. The problem is that manual drains are easily neglected, particularly when the vessel has been installed somewhere inconvenient.
Automatic drainage can reduce that reliance on manual intervention, although automatic drains still need inspection and maintenance.
For recycling plants, access deserves particular attention. Dust, dirt and contamination can make neglected maintenance points troublesome, so the drain should be positioned where engineers can inspect and service it without dismantling surrounding equipment.
The condensate itself must also be handled appropriately rather than simply discharged without considering oil contamination and site disposal requirements.
Specifying Air Receiver Tanks for Waste Recycling Plants
When discussing a receiver requirement with Fluid-Air Components, the most useful starting information is normally the compressor free air delivery, operating pressure, maximum pressure, existing receiver capacity and the equipment responsible for major intermittent demand.
It also helps to know what has prompted the enquiry. A new installation has different considerations from a plant suffering a pressure drop at one particular machine. Likewise, replacing an existing receiver is different from adding local storage to support an expansion.
Fluid-Air Components supplies air receiver tanks from 15 to 1,500 litres, covering smaller secondary storage requirements through to larger central receivers. Standard 11 bar vessels and 15 bar options are available, together with different finishes and internal protection options for applications that require them.
The range makes it possible to match the receiver to the application rather than simply choosing the next standard size above the vessel already installed.
If you are specifying compressed air storage for a new recycling plant, expanding an existing system or trying to resolve recurring pressure problems, Fluid-Air Components can help assess the demand, compressor output, operating pressure and installation conditions before recommending the appropriate air receiver capacity and configuration.
Get in touch with the expert team today, and we’ll help you identify the right size pressure receiver to ensure your application functions exactly as it should.
