Optical gas imaging gives oil and gas teams a way to screen equipment for certain otherwise invisible hydrocarbon gas leaks while the facility remains in operation. The technology is fast and non-contact, but it is not a universal gas detector and it does not make every release visible under every condition.

Redhead Services uses FLIR GF300/320 infrared-camera technology for leak detection and inspection applications. These cameras can help scan piping, flanges, connections, and other equipment efficiently across a facility. Understanding what affects visibility is essential when interpreting an image or planning an inspection.

How Optical Gas Imaging Works

An optical gas imaging camera is not simply showing the temperature of a gas cloud. The camera is designed around an infrared spectral range in which certain gases absorb infrared energy. When a compatible gas moves between a suitable background and the camera, that absorption can appear as a moving plume in the image.

This is different from ordinary thermal inspection, even though both use infrared technology. Whether a plume is visible depends on the gas, the camera, the background, environmental conditions, release rate, distance, and the way the operator views the component.

What a FLIR GF320-Class Camera Is Used to Find

The FLIR GF320 is designed for optical imaging of methane and a range of volatile organic compounds. In oil and gas service, it is used to inspect potential leak points without touching the equipment or interrupting normal operation.

Common inspection points can include:

• Valves and valve stems
• Flanges and threaded connections
• Compressor seals and associated piping
• Pressure-relief and vent components
• Tank and separator connections
• Instrument fittings and tubing connections
• Other accessible components that handle compatible hydrocarbon streams

The ability to scan many components from a safe working position is one of OGI's main strengths. A visible plume can direct maintenance personnel toward a probable source that warrants confirmation and repair.

Gas Compatibility Still Matters

A camera only images gases that interact sufficiently with its spectral band. A GF320-class camera should not be described as detecting every gas, every vapor, or every hazardous atmosphere. The expected process composition needs to be compared with the camera's documented response.

OGI also does not identify an unknown gas merely from the appearance of the plume. Process knowledge, equipment service, and additional testing may be needed to determine what is present.

Temperature Contrast and Background Affect Visibility

For a plume to stand out, the camera needs useful infrared contrast between the gas and the background behind it. A solid surface with a different apparent temperature often provides a better background than open sky or a visually complex scene.

The operator may need to change position, viewing angle, focus, or camera settings to improve the image. Looking at a component from only one direction can miss a plume that becomes clear from another angle.

Wind Can Reveal or Hide a Leak

Air movement changes the shape and concentration of a gas plume. Light movement may help show a plume leaving a component. Strong or turbulent wind can disperse it rapidly, reduce apparent contrast, and make the source harder to locate.

Wind direction also determines where the plume travels. Operators should observe the downwind side of a suspected component when it is safe and practical, while maintaining awareness of site hazards and approved work practices.

Distance and Viewing Angle Matter

The farther the camera is from a small leak, the fewer image details represent the plume and source. Excessive distance can make a marginal release difficult to recognize. Obstructions, insulation, guards, equipment orientation, and elevated components can also limit the available view.

Operators should obtain more than one safe perspective when conditions permit. A plume seen from a distance may guide the inspection, but closer observation is often needed to distinguish the leaking component from gas moving across nearby equipment.

Camera Setup and Operator Technique Are Part of the Inspection

Focus, range, level, scene composition, and image-processing mode affect what the operator can see. So do scan speed and observation time. Moving quickly past a component or viewing an unstable image can reduce the chance of recognizing a small plume.

A sound inspection is systematic. The operator follows an organized route, observes relevant components from usable angles, allows time to evaluate each scene, and records enough context to relocate a suspected source.

What OGI Does Not Establish by Itself

• Seeing a plume does not automatically provide a leak rate or mass-emission value.
• An inspection cannot prove that no leak exists because unfavorable conditions can hide a compatible release.
• The camera does not identify every gas because detection depends on spectral compatibility.
• OGI does not replace required personal, area, or confined-space gas monitoring.
• OGI alone does not complete a compliance program, which may also require defined procedures, inspection schedules, records, repairs, and verification.

Use OGI as Part of a Complete Inspection Process

A useful process starts by identifying the equipment and components to be screened. The inspection should account for access, expected gases, operating state, weather, background, and known problem areas. Suspected leaks should be tied to a specific component or location so the repair team can act on the finding.

After repair, the area can be checked again under suitable conditions. If the purpose requires confirmation, quantification, or a specific regulatory method, OGI may need to be paired with another approved instrument or procedure.

Regulatory Use Requires the Correct Procedure

Federal and state programs may allow or require optical gas imaging for particular sources and facilities. Those programs can specify camera performance, operator practices, monitoring plans, records, repair timing, and follow-up. Requirements also change over time.

Operators should identify the rule, permit, company standard, or voluntary program that applies to the site before treating a survey as a compliance inspection. A camera's technical capability does not by itself establish that a particular survey satisfies every requirement.

Questions to Resolve Before an Inspection

• What equipment and components are in scope?
• What gases are expected in each process stream?
• Is the work preventive maintenance, troubleshooting, or part of a defined monitoring program?
• What operating state should the equipment be in?
• What site access, safety orientation, and protective equipment are required?
• How will suspected sources be identified for the repair team?
• Is repair verification or another measurement method required?

Use the Camera's Strengths Without Overstating the Result

Optical gas imaging is valuable because it lets a trained operator screen large numbers of components efficiently and see the behavior of compatible gas releases in real time. Its limitations are equally important: visibility changes with the gas, scene, weather, distance, settings, and operator technique.

Redhead Services provides infrared-camera solutions using FLIR GF300/320 technology for oil and gas operations. To discuss leak-detection or inspection needs across West Texas and Southeast New Mexico, contact the Redhead team.