Robotic Visual Inspections Missed 50+ Cracks — Bioscan Found Them in One Visit

Overview

A multi-national dairy manufacturer relied on a robotic visual inspections for 3 consecutive years. Each inspection reported zero cracks inside the spray dryer, and the equipment was considered conformed.

In 2024, after hygiene deviations and rising micro counts, the manufacturer requested a full inspection from Bioscan using it’s advanced electronic crack detection. Bioscan identified more than 50 cracks and defects in a single visit.

Robotic Visual Inspections (Years 1–3)

• HD visual robotic camera
• Limited access in complex geometries
• Limitied detection capability for micro-cracks or weld fatigue
• 0 defects reported each year

Bioscan Inspection (Year 4)

• Electromagnetic crack detection
• Access platform and rope-access methods ensuring full surface coverage
• 50+ cracks discovered, including:
  • Weld cracks
  • Fatigue cracks
  • HAZ cracking
  • Through-wall defects
  • High-risk cracks near nozzles, bustle, duct transitions

Impact on the Client

1. Major Unplanned Shutdown

The extent of damage required a two-week emergency shutdown, halting production immediately.

2. Direct Financial Costs

• $200,000 – welding repairs, polishing, labour and specialist access
• $950,000 – production losses from unplanned downtime
• Total: $1,150,000 impact from issues that went undetected for three years

3. Contamination and Compliance Risk

Because cracks had been present for multiple years, the site faced:

• Hidden microbial harbourage
• Reduced cleaning effectiveness
• Compromised hygiene during audits
• Increased product quality risk

The visual inspection “all clear” created a false sense of security.

Root Cause of Missed Defects

• Robot could not access or illuminate critical weld zones
• Surface glare and product residue concealed cracks
• Technology limited to visual inspection — no crack detection
• No detection of early-stage or sub-surface defects

Outcome

• Dryer restored to full hygienic condition after repair
• Structural integrity re-established
• Robotic inspections discontinued
• Bioscan adopted as the annual inspection standard across the site

Conclusion

This case highlights the risks of relying solely on robotic visual inspection. Over 50 cracks developed undetected, resulting in:

• Serious food-safety exposure
• A two-week shutdown
• $1,150,000 in unexpected costs

Bioscan’s technology provided the accuracy and depth needed to prevent future failures and
protect production integrity.