Complete compressed air system.
Combine compression, cooling, treatment, storage and distribution at the required pressure and point-of-use air quality. The layout below explains the system interfaces; it is not a photograph of an installed project.
DETAILED SELECTION & OPERATION
Separate sustained demand from short peaks
The catalogue table gives nominal flow and motor rated power; it does not state a project-specific continuous-duty or peak-response guarantee. For sustained 4.0 MPa demand, evaluate delivered flow at the agreed pressure and reference conditions together with control range, cooling capacity and allowable operating limits. For short demand events, record peak flow, duration, repetition rate, simultaneous users, usable receiver pressure band and acceptable recovery time.
Do not size a system by multiplying the largest connected load by an unexplained diversity factor. A high-pressure receiver can buffer a defined event when its usable pressure swing, absolute-pressure basis, temperature and recovery are considered. It cannot make an undersized compressor meet continuous demand. The air receiver sizing guide and pressure-drop guide cover the shared principles without repeating them here.
- Normal flow at the point of use and its stated reference basis.
- Peak flow, event duration, events per hour and simultaneous demand.
- Minimum process inlet pressure, maximum permitted pressure and recovery target.
- Control sequence and the upstream behaviour if a booster is part of the proposal.
Illustrative 40 bar selection brief: continuous flow and a peak event
This is a teaching example, not a recommendation of a catalogue model. Assume one 4.0 MPa process branch needs 10 m³/min continuously and rises to 14 m³/min for 45 seconds once every 10 minutes. Assume all quantities use one stated, hypothetical common reference condition; they are not asserted to be FAD. Assume the process requires at least 3.7 MPa at its inlet and the site has separately defined ambient, electrical and cooling conditions.
The additional event flow is 4 m³/min for 45 seconds. Its time-average contribution is 4 × 45 ÷ 600 = 0.30 m³/min, making the example's time-average demand 10.30 m³/min. The instantaneous requirement during the event is 14 m³/min. Neither number can be matched directly to the source table's nominal-flow label: first reconcile the flow bases, treatment losses, receiver pressure swing, recovery time and the delivered-flow evidence at the required discharge pressure.
The RFQ should ask the supplier to show whether the compressor supplies the sustained component, how any receiver covers the 45-second event, how quickly pressure recovers, and what happens if the event repeats early or overlaps another load. It should also state the required maximum pressure, treatment pressure loss, downstream component ratings and commissioning measurements.
| Item | Assumed input or calculation | Why it matters |
|---|---|---|
| Normal process demand | 10 m³/min continuously at one stated hypothetical reference condition | Forms the sustained capacity check; it is not automatically FAD. |
| Peak event | 14 m³/min for 45 seconds, once every 600 seconds | Sets the instantaneous flow and receiver/recovery assessment. |
| Average event increment | (14 − 10) × 45 ÷ 600 = 0.30 m³/min | Shows why a time average does not replace a peak-demand check. |
| Time-average demand | 10 + 0.30 = 10.30 m³/min | A planning input only; final selection needs a matching flow basis and delivered-flow evidence. |
| Point-of-use pressure | Minimum 3.7 MPa, assumed for this example | Leaves the supplier to calculate the discharge-pressure requirement after treatment and distribution loss. |
SELECTION & OPERATION
Frequently asked questions
Which 40 bar models are shown in the catalogue table?
The cleaned table contains only /40 entries with a visible discharge-pressure cell of 4 under the source table's MPa heading: EBLG+DLG-6/40-75Kw and EBLGII+DLG models from 10/40-132Kw through 26/40-265Kw. The table presents the confirmed value as 40 bar (4.0 MPa), retains nominal volume flow as the source label, and identifies motor rated power separately.
Why is EBLGII+DLG-8/40-110Kw not in the 40 bar table?
Its model code contains /40, but the original parameter-table pressure cell shows 2 under the MPa heading. Because the two source signals conflict, it is excluded until a supplier provides a written clarification. It should not be treated as evidence for a 40 bar configuration.
Does a 4.0 MPa compressor discharge guarantee 4.0 MPa at the machine?
No. Pressure is lost through cooling, separation, treatment, receiver connections, valves, piping, hoses and regulation. State the minimum pressure required at the equipment inlet and request a pressure-loss calculation at the agreed flow and condition.
Can I compare the catalogue flows with FAD values from another quote?
Not without a common reference basis. The source calls these values nominal volume flow in m³/min and does not label them FAD. Ask each supplier to state flow conditions, discharge pressure and test or rating basis before making a like-for-like comparison.
Can one 40 bar system serve every PET or food-related operation?
No. PET blowing and food-related duties need their own process, pressure-zone and air-quality brief. Define the actual point-of-use purity target and verification method; neither a high-pressure rating nor an aftercooler establishes a universal process-air quality outcome.
Technical references
- CAGI Air Compressor ↗
General compressor terminology and the need to compare performance using consistent rating conditions; not a source for the catalogue model values.
- U.S. Department of Energy, Improving Compressed Air System Performance ↗
System-level treatment of compressed-air supply, storage, demand peaks, distribution and pressure management; not a project design approval.
- ISO 8573-4:2019, Compressed air ↗
Official ISO browsing entry for compressed-air sampling and measurement context; the required quality class and verification remain application-specific.