Explosion-Proof Borescope: What You Need to Know Before Buying

1. Overview of Explosion-Proof Borescope Inspection

Industries such as oil and gas, petrochemical processing, and chemical manufacturing often operate in hazardous areas where flammable gases, vapors, or combustible dust may be present.

In these environments, conventional electronic inspection equipment may introduce potential ignition sources, such as electrical sparks or excessive surface temperatures. As a result, standard industrial borescopes may not be suitable for use in classified hazardous areas.

An explosion-proof borescope is designed for applications where specific explosion-protection requirements apply. Depending on its certification and protection concept, the equipment may use technologies such as intrinsic safety, energy limitation, or other approved protection methods to reduce the risk of ignition.

However, the term "explosion-proof" does not mean that a borescope is suitable for every hazardous environment.

Before purchasing or using the equipment, always verify the actual certification, hazardous-area classification, gas or dust group, temperature class, and operating conditions.

The equipment must be selected according to the requirements of the specific site.

2. What Is an Explosion-Proof Borescope?

An explosion-proof borescope is an industrial inspection system designed for use in environments where explosive atmospheres may occur and where certified equipment is required.

Depending on the applicable protection concept and certification, the system is designed to control potential ignition sources associated with electrical energy, heat, sparks, or other hazards.

Common international certification systems include:

• ATEX

• IECEx

The applicable requirements vary by country, industry, hazardous-area classification, and operating environment.

A certified hazardous-area borescope may be used for remote visual inspection of equipment such as:

• Oil and gas processing equipment

• Storage tanks

• Pipelines

• Chemical processing equipment

• Pumps and valves

• Heat exchangers

• Industrial machinery

• Pressure vessels

• Other equipment located in classified hazardous areas

The certification must match the actual application rather than simply the general industry sector.

3. Explosion-Proof Certification: The First Selection Priority

For hazardous-area inspection, certification compliance should be the first consideration.

Different products can have substantially different protection levels, certification scopes, temperature classes, and permitted applications.

Before purchasing an explosion-proof videoscope, verify the following information.

1. Certification Standard

Check whether the equipment has applicable third-party certification such as ATEX or IECEx.

Do not rely solely on a manufacturer's marketing statement that a product is "explosion-proof."

Ask for the actual certification documentation and verify that it applies to the complete equipment configuration being purchased.

2. Hazardous Area Classification

Determine which hazardous zone or area classification applies to the inspection location.

For gas and vapor environments, classifications may include:

• Zone 0

• Zone 1

• Zone 2

Dust hazards use different classification systems and protection requirements.

The borescope certification must correspond to the hazardous-area classification of the intended application.

3. Gas and Dust Groups

For gas hazards, certification may specify groups such as:

• IIA

• IIB

• IIC

Dust applications have separate protection classifications and requirements.

Gas and dust certifications should not be assumed to be interchangeable.

4. Temperature Class

The equipment's temperature classification is another critical parameter.

For example, gas equipment may be assigned temperature classes such as:

• T1

• T2

• T3

• T4

• T5

• T6

The maximum surface temperature of the equipment must be appropriate for the hazardous substance present at the inspection site.

5. Permitted Operating Conditions

Verify the certified operating conditions, including where applicable:

• Ambient temperature

• Humidity

• Pressure

• Gas or vapor type

• Dust conditions

• Installation or operating restrictions

A product may be certified for a hazardous area but still have environmental limitations that prevent its use under certain conditions.

6. Complete System Certification

One of the most important purchasing questions is whether the certification covers the complete inspection system.

Check the certification scope for:

• Main control unit

• Probe

• Camera tip

• Battery

• Charger

• Power supply

• External accessories

• Other components used during inspection

Do not assume that a certified probe automatically makes a non-certified main unit or accessory suitable for hazardous-area use.

7. Battery and Power Supply

Battery-powered equipment requires particular attention in hazardous environments.

Use only the battery, charger, and power accessories specified and approved for the certified equipment configuration.

Do not substitute ordinary batteries or third-party charging equipment unless explicitly permitted by the certification and manufacturer.

4. Main Industrial Applications of Explosion-Proof Borescopes

1. Oil and Gas Inspection

Oil and gas facilities can contain flammable gases and vapors, making hazardous-area classification an important consideration.

A certified hazardous-area borescope can support visual inspection of accessible internal areas of:

• Pipelines

• Storage tanks

• Pumps

• Valves

• Processing equipment

• Machinery

• Other oil and gas equipment

Depending on the equipment configuration and site procedures, visual inspection may help identify corrosion, deposits, blockages, surface damage, foreign objects, and other visible conditions.

2. Petrochemical Inspection

Refineries and petrochemical plants contain process equipment where flammable substances may be present.

An appropriately certified explosion-proof videoscope can support remote visual inspection of accessible areas in accordance with the site's hazardous-area requirements.

Typical inspection targets include:

• Process piping

• Heat exchangers

• Vessels

• Reactors

• Pumps

• Valves

• Internal surfaces

The equipment must be certified for the specific hazardous-area classification rather than selected solely because it is intended for the petrochemical industry.

3. Chemical Processing

Chemical plants may contain confined spaces, process vessels, pipelines, and equipment handling flammable materials.

A suitable hazardous-area borescope can provide remote visual access to internal areas without requiring personnel to enter the inspection space.

It may be used to inspect visible conditions such as:

• Corrosion

• Deposits

• Blockages

• Surface damage

• Foreign objects

• Internal contamination

Additional NDT methods may be required where defects cannot be evaluated through visual inspection alone.

4. Other Hazardous Industrial Environments

Some manufacturing processes may involve combustible dust or flammable solvent vapors.

Examples can include selected:

• Powder-processing facilities

• Coating and painting processes

• Chemical production areas

• Battery manufacturing processes

• Other classified industrial environments

The appropriate equipment must be selected according to the actual hazardous substance and area classification.

5. Selecting an Explosion-Proof Borescope: Hardware Matters Too

Certification addresses hazardous-area compliance, but it does not automatically guarantee that the borescope is the best tool for the inspection task.

The inspection system should also be matched to the physical requirements of the application.

1. Probe Diameter

The probe diameter must be compatible with the inspection opening.

A smaller probe may be required for narrow passages, while a larger probe may provide different imaging, illumination, or mechanical characteristics depending on the design.

Always verify the actual outside diameter rather than relying on a nominal product description.

2. Probe Length

Select the probe length according to the actual inspection path.

For deep vessels, pipelines, and machinery, the probe must be long enough to reach the target without excessive unused length.

Consider:

• Access point location

• Actual path length

• Internal geometry

• Bends

• Inspection depth

• Probe handling characteristics

3. Articulation and Steering

Complex industrial equipment can contain bends, corners, and hidden areas.

A controllable articulation system can help position the camera toward different inspection targets.

Depending on the certified configuration, consider:

• 2-way articulation

• 4-way articulation

• Side-view capability

• Dual-view capability

• Switchable viewing direction

4. Viewing Direction

The required viewing direction depends on the inspection geometry.

Forward View is useful when the target is directly ahead of the probe.

Side View can be useful for inspecting:

• Pipe walls

• Circumferential weld areas

• Side surfaces

• Internal vessel walls

• Recessed areas

A Dual-View system can provide forward and side viewing when both directions are required.

5. Illumination and Image Quality

Hazardous-area equipment often needs to inspect dark, enclosed spaces.

The system should provide sufficient illumination and image quality for the intended inspection task.

The camera should allow the operator to identify relevant surface conditions such as:

• Cracks

• Corrosion

• Wear

• Deposits

• Blockages

• Surface damage

Actual image performance depends on the complete optical, camera, and lighting design.

6. Understanding ATEX Borescope Certification

If the inspection location is subject to ATEX requirements, a standard industrial borescope should not be assumed to be suitable.

An ATEX borescope must have certification appropriate to the intended hazardous-area application.

Before bringing the equipment into an ATEX-controlled area, verify:

1. The ATEX certificate is valid and applicable.

2. The equipment classification matches the hazardous zone.

3. The gas or dust group is appropriate.

4. The temperature class is suitable.

5. The certified ambient temperature range is compatible with the site.

6. The certification covers the actual equipment configuration.

7. Batteries, chargers, and accessories comply with the approved configuration.

ATEX compliance is application-specific. A product with ATEX certification is not automatically approved for every ATEX hazardous area.

7. Explosion-Proof Borescope Purchasing Checklist

Before purchasing, ask the supplier the following questions and request written documentation where appropriate.

Certification

• Which explosion-protection certifications does the complete system have?

• Is the certification issued by an appropriate certification body?

• Can the certificate and certification number be verified?

• What is the exact protection marking?

Hazardous Area

• Is the system approved for Zone 0, Zone 1, or Zone 2?

• Is it designed for gas/vapor environments, dust environments, or both?

• Which gas or dust groups are covered?

Temperature

• What is the equipment's temperature class?

• What is the maximum permitted surface temperature?

• What ambient temperature range is allowed?

Equipment Configuration

• Does certification cover the main unit?

• Does it cover the probe and camera?

• Does it cover the battery?

• Does it cover the charger?

• Are all external accessories included in the certified configuration?

Operating Conditions

• What environmental restrictions apply?

• Are there restrictions on inspection duration?

• Are there restrictions on charging or battery replacement?

• What operating conditions are prohibited?

These questions can help prevent a common purchasing mistake: buying a product described as "explosion-proof" without confirming whether its certification actually matches the intended hazardous area.

8. Explosion-Proof Borescope vs. Standard Industrial Borescope

The key difference is not simply product construction—it is verified compliance with the requirements of the intended hazardous environment.

9. Key Safety Considerations

Explosion-proof inspection equipment should never be treated as a substitute for site safety procedures.

Before inspection:

• Confirm the hazardous-area classification.

• Verify the equipment certification.

• Check the certification marking against the site requirements.

• Confirm the probe, battery, charger, and accessories are part of the approved configuration.

• Check the environmental and temperature limits.

• Follow the site's permit-to-work and hazardous-area procedures.

• Ensure operators are trained to use the equipment correctly.

If the hazardous-area classification or equipment compatibility is unclear, do not rely on assumptions. Obtain confirmation from the equipment manufacturer, certification documentation, and the responsible site safety or engineering personnel.

10. Conclusion

An explosion-proof borescope is a specialized inspection tool for industrial environments where flammable gases, vapors, or combustible dust may create hazardous conditions.

Its most important feature is not simply the label "explosion-proof," but verified certification and suitability for the specific hazardous area.

Before purchasing, confirm the applicable ATEX or IECEx certification, hazardous zone, gas or dust group, temperature class, environmental limits, and certified equipment configuration.

Then evaluate the inspection requirements, including:

• Probe diameter

• Probe length

• Articulation

• Viewing direction

• Image quality

• Illumination

• Recording capabilities

The basic principle is:

Choose the inspection system according to both the hazardous-area requirements and the actual inspection task.

When certification and application requirements are correctly matched, an explosion-proof borescope can provide remote visual inspection while helping maintenance and inspection teams work within the applicable hazardous-area controls.