- Author
- Byron Raal, CAS Founder-Editor About the author
- Date last checked
- 13 September 2026
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An air receiver stores compressed air to help bridge short demand peaks and support compressor control. Choose its volume, pressure rating and location as part of the complete system. A compressor’s motor power alone does not establish the required tank size, and a new tank does not by itself establish a compliant installation.
How big should my air receiver tank be?
Start with measured demand, the duration of each peak, the air supply available during that event, and the usable pressure range at the receiver. Then ask the compressor supplier to check control response, minimum system volume and recovery before the next event. For VSD compressors, include operation below minimum speed; variable speed does not remove the need to assess storage. Use declared free air delivery (FAD) at the relevant pressure, rather than converting motor kW into assumed airflow.
Before requesting a receiver quote
- Record the demand peak and its duration.
- Establish the pressure needed at the user, allowing for downstream losses.
- Confirm what the compressor and treatment system can supply during the peak.
- Ask for a documented storage and control calculation, including recharge time.
Sizing one now? Get the registration worksheet.
Use the free worksheet to gather the vessel details, check the stated scope and prepare registration questions for your state or territory. The result needs the appropriate competent review; the worksheet is not a registration certificate. The download is available on the next screen.
We email you the PDF and nothing else unless you ask. Form not loading? Email byron@compressedairsolutions.com.au with your enquiry.
Want a supplier to spec the receiver instead? Send a receiver enquiry. Independent and vendor-neutral, we do not sell equipment.
This guide helps engineers, plant managers and buyers prepare a receiver brief and compare proposals. For compressor selection, assess the demand profile separately: storage can bridge a temporary shortfall, but cannot sustain demand above available supply indefinitely.
What Is a Receiver Tank?
A receiver is a pressure vessel connected to the compressed air system. It holds an inventory of air that can be released as pressure falls. Storage may be located near the compressor, downstream of treatment, or close to an intermittent demand. The useful volume depends on whether that storage is actually available through the intervening valves, pipework and pressure controls.
The nameplate volume is the vessel’s internal volume. It is not the volume of free air available to a tool. The usable stored quantity depends on the pressure difference through which the system can operate. A large receiver behind a restrictive connection may still fail to support a fast demand event at its required pressure.
Why Receiver Size Matters
Storage and controls work together. The Australian Government’s compressed-air guidance identifies receivers as a way to smooth short-term demand and notes that additional storage can sometimes allow a trim compressor to be switched off. That is a possible system outcome, not a guaranteed saving from purchasing a larger tank.
- Pressure at the process: log pressure where the air is used during the actual event. Compare it with pressure at the receiver to distinguish insufficient storage from distribution losses.
- Compressor control: identify start/stop, load/unload, modulation or variable-speed operation. Motor starts and load/unload cycles are different events with different equipment limits.
- Repeated peaks: check the interval between demand events. A proposal must explain how storage recovers while the remaining plant continues to consume air.
- Air quality: specify the required quality at the point of use. A receiver may collect condensate, but it is not a substitute for the drying, separation or filtration that the application requires.
How to Size an Air Receiver
A storage calculation for a short demand event
The US Department of Energy sourcebook, printed page 42, gives an approximate storage calculation. In consistent SI units:
V = Qshortfall × t × Pref / (Phigh − Plow)
- V: receiver volume in litres.
- Qshortfall: demand minus available supply during the event, in L/s of free air on the same reference basis. If supply is zero, use the full demand.
- t: event duration in seconds.
- Pref: absolute reference atmospheric pressure in bar.
- Phigh and Plow: initial and lowest usable receiver pressures in bar, both gauge or both absolute.
This approximation assumes constant flow shortfall and temperature consistent with the free-air reference. The lower pressure is not compressor inlet pressure. Establish it from the required downstream pressure and losses. Changing flows, temperature and control delays require a more detailed assessment.
Illustrative calculation - not a tank selection
Suppose a hypothetical process needs 20 L/s for 30 seconds and 12 L/s remains available from the compressor on the same free-air basis. Assume the receiver can fall from 8 to 7 bar gauge, with a reference pressure of 1.01325 bar absolute:
Shortfall = 20 − 12 = 8 L/s
Calculated volume = 8 × 30 × 1.01325 / (8 − 7) = 243.18 L
This arithmetic does not justify ordering a 250 L vessel. The assumed pressure window must first be shown to work at the process; the proposal must also account for actual temperature, usable connected storage, response delays and recharge. If these assumptions change, so does the calculation. Retain the inputs with the quote so another person can reproduce the result.
Check control and pulsation requirements separately
For a cycling compressor, ask the manufacturer to specify the acceptable cycle or start frequency and the storage calculation for that control arrangement. Atlas Copco’s distribution guidance distinguishes receiver sizing for compressor control from sizing for short-duration demand peaks. Its machine-specific loading-frequency example is not a universal setting.
For piston compressors, include pulsation, vibration and pipe-support requirements in the equipment review. Do not select a tank solely from a generic multiple of swept volume. Ask the supplier to document the complete package and installation requirements. Our air receiver tank sizing guide develops the storage and control questions further.
Discuss your receiver requirement
Send us your compressor free air delivery, peak demand and duration, operating pressure, minimum required pressure and control information. We can review your brief and discuss a suitable Australian provider if one is available. We ask for your written permission before an introduction and explain any referral payment arrangement. There is no cost to enquire.
Form not loading? Email us directly at byron@compressedairsolutions.com.au with your enquiry.
Before adding capacity, investigate avoidable demand. The leak cost calculator can help explore assumptions; a leak detection survey locates losses, and a compressed air audit can provide measured operating evidence.
Once a candidate vessel is identified, check registration separately. Use the worksheet above to assemble the inputs and questions for a competent reviewer. For a NSW installation, see pressure vessel registration in NSW. A storage calculation does not determine the vessel’s hazard classification or registration obligations.
Selecting a Tank: Vertical vs Horizontal
Compare the actual manufacturer’s drawings for the proposed models. Equal-volume tanks do not have a universal footprint ratio, and orientation alone does not establish drainage performance, structural suitability or compliance.
| Decision | Vertical proposal | Horizontal proposal |
|---|---|---|
| Space | Check overall height and access above the vessel. | Check overall length and access along both sides. |
| Access | Confirm reachable drains, instruments and inspection openings. | Confirm access below the vessel and around its supports. |
| Structure | Obtain support, anchorage and foundation requirements for the site. | Obtain support, anchorage and foundation requirements for the site. |
| Package layout | Check pipe connections and maintenance withdrawal space. | If equipment is mounted on the receiver, verify that the assembly is designed for it. |
| Handling | Check delivery access, lifting arrangements and installed height. | Check delivery access, lifting arrangements and installed length. |
Ask the supplier to show these dimensions on the layout. Include the inspector’s access requirements before committing the floor space; use the specified mounting arrangement rather than assuming that generic vibration pads or a particular concrete base suit every vessel.
Australian Standards and Compliance
Keep four questions separate: the design basis of the vessel, its hazard classification, any required registrations, and its inspection plan. None can be established from a photograph of an inspection sticker alone.
- Design: AS 1210:2010, Pressure vessels, is a relevant Australian design reference. Obtain the actual vessel’s design and manufacturing documentation, including the edition and amendments used. Where another design code is proposed, have its suitability and local acceptance confirmed.
- Hazard classification: AS 4343 addresses pressure-equipment hazard levels. Use the complete classification basis, including the applicable pressure, volume, contents and temperature. Do not assume every air receiver is in the same gas category.
- In-service condition: the publisher lists AS/NZS 3788:2024 and Amendment 1:2025. Its scope includes inspection and fitness for service, with repairs, modifications and re-rating. Have the competent person establish the applicable requirements for the equipment and jurisdiction.
Safe Work Australia distinguishes design registration from registration of an individual plant item and directs users to their local regulator. The model framework is not a substitute for the enacted law applying at the installation. Registration, inspection and supplier paperwork are separate parts of the assessment.
For example, SafeWork SA identifies A–D pressure-vessel design registration and A–C item registration, with its stated scope and exceptions. It also warns that air above 120 °C is treated as harmful gas under AS 4343:2014. Its inspection guidance still references the 2006 inspection edition. The newest publisher edition should therefore not be described as automatically enacted throughout Australia.
Use our Australian registration guide to find the relevant jurisdiction, including Victoria. Ask the supplier and competent reviewer to resolve the applicable law, code and documentation before supply or use. A receiver built to an earlier edition is not automatically unsafe, but its age or original certificate alone does not establish current fitness for service.
Installation and Commissioning
Decide where storage belongs
A wet receiver sits before the dryer; a dry receiver sits after it. Atlas Copco’s receiver-placement guidance explains the trade-off: upstream storage can collect condensate as air cools, but a demand surge through the dryer can exceed its capacity. Downstream storage holds air already passed through the dryer and can support a peak without routing that entire peak through it.
Ask the designer to show the proposed flow path and check treatment capacity at peak flow, operating pressure and inlet conditions. Storage on both sides is one possible arrangement, not a compulsory layout for every site. Filter grades, dryer type, check valves and pressure controls belong in the specific system design. The receiver sizing guide provides related storage questions.
Agree the installation scope in the quote
- Location and support: identify the foundation and anchorage design, external loads, environmental exposure, access and protection from vehicle impact.
- Connections: show pipe sizes, supports, pressure ratings, drainage and the arrangement for safe isolation and depressurisation.
- Overpressure protection: have the designer or competent supplier confirm the relief device’s set pressure, capacity and installation for the protected equipment. Do not derive a setting by adding a fixed amount to compressor cut-out.
- Discharge: confirm a safe discharge arrangement that preserves the relief device’s function. Adding a muffler, restriction or isolation valve requires proper engineering assessment; it is not a generic noise-control step.
- Instruments and drains: identify the specified pressure indication, verification requirements and condensate-handling arrangement. A digital or mechanical display alone is not proof of a complete safety system.
The 2024 inspection standard’s pressure-relief section addresses device identification, settings, inspection records, installation and safe discharge. Apply the current requirements and manufacturer instructions through the competent person. Do not adjust relief settings, force a valve to lift, or improvise a pressure test from a general web guide.
Require a commissioning handover
Agree who will verify the installed equipment and what evidence will be supplied before operation. Request:
- The vessel’s identifiable manufacturing and design records, nameplate information, operating limits and applicable registrations.
- The completed installation and commissioning inspection records, with any defects and their resolution.
- Evidence that the protection, controls, gauges and drainage are suitable and have been checked under the applicable procedures.
- Operating, isolation, maintenance and emergency procedures; the inspection plan; and named responsibility for the next actions.
A one-hour pressure hold or absence of an audible leak is not a commissioning standard. Have any required pressure test defined and conducted by competent personnel using the appropriate procedure. Keep the commissioning evidence with the vessel’s ongoing records.
Inspection and Maintenance
Set the inspection plan for the actual vessel and service. AS/NZS 3788:2024 distinguishes commissioning, time-based inspection, risk-based inspection and operating surveillance. Its table and notes must be read together. Changes in duty, deterioration, repairs or periods out of use can change the assessment; an extended interval is not an automatic entitlement.
WorkSafe Victoria’s air-receiver guidance, reviewed 7 September 2026, calls for competent inspection and records for hazard levels A–D. Its receiver table explicitly cites the 2006 standard; its relief-valve row now refers to the 2024 standard’s Clause 4.6. Do not turn that mixed-reference table into a single Australia-wide inspection schedule.
WorkSafe also calls for relief-valve overhaul and bench testing by competent people at intervals that maintain safe condition, with operational monitoring included in procedures. This is not a universal instruction to bench-test every valve after the same number of years. Have the inspector document the interval and basis for the installed device.
For the site maintenance plan, establish what operators may observe safely, what they must report, and which activities require a qualified service provider or inspector. Include abnormal pressure behaviour, leakage, corrosion, damage, drainage problems and inaccessible or damaged protective devices. A routine walk-around does not replace the required inspection. Follow the site’s isolation and emergency procedures when defects are suspected.
Drain selection and servicing should account for the actual condensate load, pressure, contamination and manufacturer instructions. Inspect for failure both closed and open: one can retain liquid, the other can waste compressed air. Appearance alone cannot establish condensate quality or the permitted disposal route. Arrange appropriate collection and disposal for the site.
Keep inspection reports and maintenance history, not only reminder labels. Ask the competent person to record the next due activities and any operating restrictions. For more detail, see air receiver inspection requirements. Hydrostatic testing is not a substitute for an inspection plan or a task to schedule from tank age alone; the need and procedure must be determined for the equipment and circumstances.
Frequently asked questions
How do I size an air receiver tank for my compressor?
Begin with measured demand, peak duration, available supply during the event and the usable receiver pressure range. A storage calculation estimates the volume needed to bridge the flow shortfall. Have the supplier also check compressor controls, minimum system volume, pressure losses and recharge before the next peak. Motor kW or a generic litres-per-flow rule alone does not select the tank.
Should I choose a vertical or horizontal air receiver?
Compare the dimensions and access requirements of the actual models. A vertical vessel may suit limited floor area; a horizontal vessel may suit restricted height. Confirm drain and inspection access, support and anchorage requirements, pipe connections, delivery access and lifting arrangements. There is no universal footprint ratio or compliance advantage based solely on orientation.
What Australian standards apply to air receiver tanks?
Relevant references include AS 1210 for vessel design, AS 4343 for hazard classification and AS/NZS 3788 for in-service inspection and fitness for service. Confirm the applicable editions and amendments, actual design documentation and jurisdiction requirements with the supplier and competent person. Design registration, item registration and inspection are separate questions; a standard designation alone does not establish compliance.
How often must my air receiver be inspected?
Have a competent person document the inspection scope and due dates for the actual vessel, service and jurisdiction. Read the applicable standard table together with its notes and conditions, including any basis for extended intervals. Operating surveillance, vessel inspection and relief-device testing are separate activities. Changes in condition or duty can require reassessment; use the recorded plan rather than a universal annual or five-year rule.
How does an air receiver tank handle pressure surge from the compressor?
Stored air can bridge a short demand increase while the compressor responds, provided sufficient volume and pressure are available through the connecting pipework. Discharge pulsation is a separate package and piping consideration, particularly with reciprocating compressors. Ask the manufacturer to confirm storage, pulsation and support requirements for the actual installation instead of selecting a receiver from a generic swept-volume multiplier.
How should I manage condensate drainage from my air receiver?
Select and service the drain under the equipment instructions and the site maintenance plan, allowing for pressure, condensate load and contamination. Check for both liquid accumulation and drains that remain open and waste air. Establish safe access, isolation and an appropriate collection and disposal route. Condensate appearance alone does not establish quality, and receiver drainage does not replace the required air treatment.
Prepare a receiver brief for review
Receiver selection depends on demand, usable pressure range and controls. Send the supplier your operating evidence and ask them to explain the proposed size and peak-event recovery. We can review your brief and discuss a suitable Australian provider if one is available. We ask for your written permission before an introduction and explain any referral payment arrangement. There is no cost to enquire.
Related reading:
- Compressed Air System Design Guide: How to plan your whole system from compressor selection to point-of-use.
- Compressor Selection Guide: Compare declared delivery, duty and demand.
- Air Quality and ISO 8573-1:2010 Purity Classes: Particulate, water, and oil contamination limits.
- Compressed Air Piping and Sizing Guide: Matching pipe diameter to airflow rate and allowable pressure drop.
- Compressor Maintenance Guide: Plan model-specific servicing alongside the receiver inspection plan.
- Compressed Air Filtration Guide: Compare treatment requirements and filtration arrangements.
- Energy Audit Guide: How to measure system efficiency and identify savings opportunities.