silo tank inspection service by Bioscan

What Do Inspectors Look for During a Silo Inspection? A Guide

When did your silo last get a good inspection? Most plants don’t think about it until a minor issue becomes a major problem. Silos quietly work behind the scenes day in and day out, with heavy loads and temperature swings causing constant changes in pressure. Given time, these stresses progressively weaken the structure, and cracks, leaks, or corrosion materialise deep within the steel walls.

That is just why regular silo inspections are so important. Professional inspection helps to spot these early signs of wear before they affect safety, product quality, or performance. Scheduled silo maintenance not only protects your structure but also reduces costly breakdowns, improves safety, and ensures that your operations continue without disruption.

Why Professional Silo Inspection Is Critical for Safety & Longevity

A silo operates under continuous stress; it has to bear the continuous pressure, temperature variation, and motion of materials, which, over time, will affect its strength. If left uninspected, latent cracks, corrosion, or weak joints may appear. These defects reduce the load-carrying capacity and may result in sudden failure or expensive contamination.

Professional inspection means each portion of the silo is checked with specialised tools. Inspectors use electronic tests and thickness gauges that find hidden corrosion or wall thinning that may not be visible from the outside. These internal issues are poorly identified in a mere visual check or by any non-professional means. That is why hiring the services of experienced inspectors is important.

For stainless-steel silos, experts recommend an annual silo safety check. Additional inspections should be undertaken in excess of this frequency after very heavy usage, violent storms, or pressure surges. Professional inspectors examine the welds, joints, and coatings. They also measure wall thicknesses and test the structures for resistance to pressure. These steps reduce risks and ensure long-term silo servicing performance.

Ensure Safe, Reliable Silo Performance with Professional Inspection

Schedule Silo Inspection

What Inspectors Check: Full Silo Inspection Checklist

A detailed silo inspection covers every part of the structure from top to bottom; each section must work properly for the silo to remain safe and stable. What inspectors usually check includes:

1. Silo Roof Inspection

The inspection of a silo roof is focused on cracks, leaks, rust, and seal integrity. The roof is the usual first part to show visible damage due to direct exposure to all types of weather. Other things that are inspected include missing bolts, corroded joints, or loose fittings of vents, access hatches, and safety rails to ensure all components are secure. A well-maintained roof prevents water from infiltrating the silo and spoiling the product.

2. Silo Wall Inspection

The experts, during a silo wall inspection, check for surface cracks, corrosion, rust patches, or even bulging. Since the walls bear most of the internal load, any weakness here is serious. Inspectors will test wall thickness with digital gauges to be certain that the structure can withstand the pressure of material stored within. Distortion can be caused by uneven pressure or poor maintenance; therefore, balancing the loads and periodic checks are two other main keys to silo safety.

3. Silo Foundation Inspection

The inspection of the silo foundation ensures that the whole structure stands firm. Inspectors check for any settlement cracks or tilting at its base. Sometimes, soil movement or water around the foundation causes instability. Any misalignment and small gap between the silo and the ground may indicate stress in the foundation. Prevention of this early will avoid dangerous collapses and uneven distributions of loads.

4. Silo Cone Inspection

The bottom section of the silo cone is the target area where material flows through to the discharge system. This part has to face high friction and abrasion from the flow of moving materials. Inspectors check for wall thinning, cracks, or corrosion in the cone and welded joints. Any structural weakness here blocks product flow or causes leaks. Regular checks help maintain smooth discharge and reduce stress on the lower shell.

5. Silo Discharge System Inspection

Inspectors will generally check valves, chutes, and feeders during a silo discharge system inspection. They check if those parts open and close accordingly without leakage or blockage. These components also suffer damage that might allow product contamination or create some mechanical strain. They also verify whether the material flow is even and if discharge performance is affected by any vibration or mechanical issue.

6. Interior Inspection

A silo interior inspection helps in the detection of hidden buildup, residue, and corrosion. Inspectors use cameras or drones to see inside tight areas safely. They check coating condition, detect peeling, and look for buildup that affects flow. Smooth internal surfaces help materials move without sticking, reducing blockages and uneven load pressure. Clean interiors also prevent contamination between storage cycles.

7. Exterior Inspection

A silo exterior inspection involves anything visible from the outside. They search for rust, dents, cracks, or coating damage. They check ladders, platforms, and beams for corrosion and loose connections. Exterior wear is often a symptom of internal issues. Eliminating exterior problems helps stop larger, more serious structural issues from developing.

Common Issues Identified in Silo Inspections

Professional inspectors identify potential issues that are not visible upon casual observation. The most common problem is internal corrosion due to humidity or reactive material inside the silo, which deteriorates the steel over time. Cracks or distortions of walls due to uneven pressure inside the silo or neglected maintenance are another common serious issue.

Leaks in the roofs or walls let in moisture, leading to contamination and the loss of product. Material building up inside silos can block flow, placing uneven stress on the walls. In some instances, this even causes settling of the soil, with the risk of base instability threatening the whole structure. Roof beams may bend or fail after extended overload. Regular professional inspections catch these issues before they force shutdowns.

Why You Need a Professional Silo Tank Repair Company

The safest way of restoring or strengthening a damaged silo is by using an accredited silo tank repair company. The repair specialists are trained in certified methods of structural reinforcement, sealing, and corrosion treatment. Advanced coatings, modern welding processes, and surface restoration will be employed to stop further damage.

These professionals also provide predictive maintenance programmes based on inspection reports. They assist in planning the future silo maintenance schedules to avoid the same problems occurring again and again. Regular servicing decreases downtime, prevents costly rebuilds, and ensures compliance with safety regulations.

Working with an experienced industrial inspection company means that your steel silos will remain in good condition. A trustworthy repair partner helps in sustaining performance over time while meeting all industry inspection criteria.

Protect Your Plant from Unexpected Silo Failures and Costly Shutdowns

Talk to BioScan Experts

Conclusion

A safe silo starts with a proper inspection plan. Scheduled professional inspections by a certified silo tank repair company help you detect cracks, corrosion, leaks, and distortion before they give you serious trouble. Such routine checks further extend the life of your steel silos and help to maintain smooth functioning. You get reliable silo servicing and restoration from trusted experts like BioScan, protecting your investment and encouraging safer working conditions. To set up an inspection or to discuss any silo maintenance needs you might have, contact BioScan today. Our team will assure you of safe and efficient silos.

FAQs

1. What does a professional silo inspection look like?

A professional inspection includes a detailed review of the roof, walls, foundation, cone, and discharge system. Inspectors use electronic tools and thickness gauges to spot corrosion, cracks, and leaks before they cause serious structural problems.

2. What kinds of problems are most commonly found in silos during inspection?

Common issues include corrosion, cracks, leakage, and wall thinning from pressure or moisture. Inspectors also find material buildup and blockages that create uneven loads, stressing the silo walls and risking long-term damage or product contamination.

3. What are the benefits of choosing a specialist silo inspection company like BioScan?

A specialist like BioScan offers complete silo servicing, accurate testing, and expert silo maintenance. Their inspections meet strict safety standards and help prevent costly breakdowns. Learn more about their tank inspection services.

4. Can older silos have special issues?

Yes. Older silos face more corrosion, weakened welds, and coating failures. They often develop hidden structural damage over time, so frequent professional inspections are crucial to maintain safety, prevent leaks, and extend their lifespan.

Read More
Robotic Visual Inspections Missed 50+ Cracks — Feature Image 01

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

Get Your Spray dryer Inspection Done Right

Get in Touch

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.

Resized Image

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

Get Your Spray dryer Inspection Done Right

Get in Touch

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.

Read More
non-destructive testing

Rapid Crack Detection Of Dairy Plant During Emergency Shutdown

Context

A major dairy products manufacturer in the Netherlands encountered a grave concern when abnormal microbes were detected in a sample from their largest spray dryers. Fearing the possibility of contamination spreading through their products, the company quickly mobilised to address the issue. With the risk of an operational halt on the horizon, the company faced a critical moment that required decisive action to mitigate the potential impact on their business operations.

Challenges

We were called in on a tight deadline to identify the root cause of abnormalities found in the samples. Our task was to perform a full internal scan of the spray dryer and carry out all necessary repairs within 24 hours of the call.

food safety compliance

The Bioscan Response

Bioscan’s emergency rapid crack detection team was deployed on the site. We performed a full internal scan of the spray dryer to detect and repair any cracks, minimise downtime, and ensure food safety compliance.

Outcome

We detected multiple micro-cracks through our micro-crack detection methods near the weld seams, which were not visible to the naked eye. Bioscan, a leading provider of inspection services, carried out localised repairs during the shutdown window and resumed production within 24 hours. With our highly effective crack detection services, we helped the dairy plant avoid significant costs, estimated at over 1 million Euros in downtime and lost output. We were praised for completing the dairy plant inspection through crack inspection services within 18 hours of arrival. 

Get Your Silo and Tank Inspection Done Right!

Get in Touch

Impact

This case underscores the power of real-time, accurate defect detection through nondestructive testing. Without Bioscan’s rapid spray dryer inspection, they could have faced the risk of contamination and massive financial and operational losses. Instead, they transformed an emergency into a successful mitigation story.

If you are looking for an effective and rapid-response-equipped industrial inspection company, look no further than Bioscan. Our industrial inspection services are designed to carry out any emergency industrial inspections within tight deadlines. Contact us today; we are just a call away!

Read More