Compressed Air System Design for New Factory Builds in South Africa
Getting the compressed air system right at the design stage saves significant cost and avoids expensive retrofits later. Here is what to plan for from the outset.
Get a QuoteStart with the Demand Assessment
Before selecting any equipment, quantify your compressed air demand accurately. List every pneumatic tool, actuator, cylinder, and process that requires compressed air. Note the flow rate (L/min or cfm), operating pressure, duty cycle, and whether the demand is continuous or intermittent. Sum the simultaneous demand (not the total installed demand) to determine the required compressor output. This is the foundation of everything — an incorrectly sized compressor cannot be corrected by any number of receivers or dryers.
Compressor Room Layout and Ventilation
The compressor room is the heart of the system. It must be well-ventilated (compressors generate significant heat), accessible for maintenance, located centrally to the main demand points to minimise distribution losses, and large enough to accommodate the compressor, receiver(s), dryer, filtration, and future expansion. Position the wet receiver close to the compressor discharge to catch bulk moisture before it enters the dryer.
Wet and Dry Receiver Placement
In a new build, install both a wet receiver (before the dryer) and a dry receiver (after the dryer). The wet receiver should be as close to the compressor as possible — allowing hot discharge air to cool, moisture to condense, and bulk liquid to be drained before reaching the dryer. The dry receiver can be positioned centrally in the distribution layout to feed the ring main — ideally at the midpoint of the highest-demand zone to reduce pressure drop across the distribution pipework.
Distribution Ring Main Design
A ring main (loop) distribution system is almost always superior to a radial (dead-end) system in a factory. The ring feeds demand points from both directions simultaneously, reducing pressure drop and providing redundancy. Size the ring main pipe diameter based on the total system flow rate and acceptable pressure drop (typically no more than 0.3–0.5 bar from the receiver to the furthest point of use). Oversizing pipe at the design stage is cheap; undersizing requires costly replacement later.
Documentation and Future-Proofing
Ensure every pressure vessel included in the new build is SANS 347 certified and that all documentation is handed over at commissioning — Declaration of Conformity, pressure test certificates, and initial inspection records. Create a documented maintenance schedule for the system covering compressor servicing, receiver drainage and inspection, dryer filter replacements, and safety valve testing. A properly documented and maintained compressed air system adds value to your facility and protects against compliance risk for years to come.
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