Air Receiver Inspection: A Practical Guide
What to inspect, how often, who is qualified to do it, and the legal consequences of operating an uninspected pressure vessel in South Africa.
Arrange Inspection Service⚠ Why Inspection Is Not Optional
An uninspected air receiver is a legal liability and a safety risk. Internal corrosion, pitting, weld fatigue, and fitting deterioration can be completely invisible from the outside — until catastrophic failure occurs. Under the Occupational Health and Safety Act and Pressure Equipment Regulations, pressure vessels must be inspected at prescribed intervals by a competent person. Failure to comply can result in:
- Criminal charges against the employer and responsible manager
- Void insurance coverage in the event of a claim
- Order to immediately decommission the vessel
- Personal injury liability if a failure injures workers
Daily / Operational Checks
- Drain condensate from the manual drain valve
- Check pressure gauge reading — confirm within operating range
- Listen for abnormal noises (hissing, pressure relief venting)
- Confirm auto-drain is functioning (if fitted)
- Check for visible leaks at fittings and welds
Time required: Under 2 minutes. Build it into your daily compressor startup checklist.
Monthly Visual Inspection
- Inspect exterior shell for corrosion, rust patches, or mechanical damage
- Check all fittings and connections for leaks or corrosion
- Test safety/relief valve by lifting the test ring briefly
- Inspect drain valve for correct operation
- Check vessel nameplate is legible and certification is current
- Verify vessel has not been modified or damaged
Record: Log the inspection date, findings, and the name of the person who carried it out.
Periodic Full Inspection (SANS 347)
- Must be carried out by a competent person as defined by SANS 347
- Includes internal inspection (enter the vessel where accessible, or use borescope)
- Check for internal corrosion, pitting, and weld condition
- Wall thickness measurement where corrosion is evident
- Pressure test if required by the inspection findings
- Issue updated inspection certificate
Interval: Typically every 12–36 months depending on vessel category and condition found at previous inspection.
What a Competent Person Must Check During Formal Inspection
| Inspection Area | What Is Assessed | Action If Problem Found |
|---|---|---|
| External shell | Corrosion, dents, cracks, weld condition | Repair, rerate, or condemn vessel |
| Internal surface | Pitting, corrosion, coating condition, sediment | Clean, treat, or remove from service |
| Welds | Cracking, porosity, undercut, heat distortion | NDT testing, repair or condemn |
| Nozzles & fittings | Thread condition, corrosion, seal integrity | Replace or reseal as needed |
| Safety valve | Set pressure, condition, test lift | Replace or recalibrate |
| Drain valve | Operation, leakage | Replace if passing or seized |
| Nameplate | Legibility, traceability | Replace nameplate if worn |
| Documentation | Original certificate, previous inspection records | Obtain missing records or pressure test |
Common Problems Found During Inspection
- Internal pitting: Caused by condensate sitting in bottom of vessel — result of infrequent draining
- Relief valve corrosion: Failed or seized safety valve — a serious hazard
- External corrosion: Cosmetic at first; can progress to structural if untreated
- Fitting leaks: Often just sealing tape or thread sealant; easy to fix
- Missing documentation: Common on older or imported vessels — requires re-testing
Inspection Records: What to Keep
- Original Declaration of Conformity (from purchase)
- Pressure test certificate
- Date and findings of each periodic inspection
- Name and qualifications of the competent person
- Any repairs carried out and when
- Next inspection due date
Store: Keep records in a dedicated file, accessible at the vessel location. They must be available for Labour Department inspection on request.
When to Take a Receiver Out of Service
- Wall thickness reduced beyond calculated minimum
- Cracking in shell or welds
- Safety valve cannot be verified to operate
- Inspection certificate has expired and re-inspection is not viable
- Vessel has been involved in a pressure incident or mechanical damage
Never: Weld, grind, drill, or modify a pressure vessel without engineering sign-off. This immediately voids its certification.
Need Inspection or Recertification?
Contact The Titan Emporium for pressure vessel inspection services, recertification, and supply of replacement SANS 347 compliant air receiver tanks across South Africa.