Pipeline Inspection Cameras: Types and Uses Explained

Crawler cameras are heavy-duty, remotely operated robots designed to travel through pipes on a set of wheels. Equipped with powerful lighting systems, they illuminate the interior of the pipe while transmitting a live video feed back to an operator's computer on the surface via a cable connection.

The operator controls speed, direction, and camera angle in real time using a surface-based monitor. Many crawler cameras feature pan, tilt, and zoom (PTZ) capabilities—sometimes referred to as tractor cameras—allowing detailed inspection of every surface within the pipe.

Crawler cameras remain the most widely used equipment for mainline pipe inspections around the globe, prized for their rugged construction and reliability in a range of pipe sizes and conditions.

Also known as pole cameras, fixed zoom cameras don't physically travel through the pipeline. Instead, a high-definition camera head is mounted on a pole and lowered from the surface into the pipe through an access point. From there, the camera's powerful zoom does the heavy lifting.

Using a combination of focus adjustment, lighting control, and both optical (20–40x) and digital (10–15x) zoom, these cameras record video footage from the entry point all the way to the far end of the pipe or the next bend. This makes them a quick and effective option for getting a general overview of a pipeline's condition without deploying a full crawler unit.

Fixed zoom cameras are a go-to solution when rapid condition assessments of a large network are needed, saving both time and resources.

When it comes to inspecting house connections, branch lines, or smaller sewer laterals, standard crawlers simply can't fit. These tighter lines—typically under 150mm in diameter—feature sharp bends and narrow passages that demand a more compact solution.

Push rod cameras are purpose-built for these challenging environments. They consist of a slim camera head attached to a flexible, coiled cable wound on a reel. The operator feeds the cable manually through the pipe, with the video feed displayed on a portable control unit. Some models include skid attachments to help keep the camera head stable and centered during operation.

Their compact design and ease of use make push rod cameras an essential tool for diagnosing issues in residential and small-diameter pipework.

Some pipelines are simply too large or too long for conventional camera equipment. In these situations, inspection rafts may be the only viable option for capturing footage from within the pipe.

These specialized devices are commonly deployed in outfall tunnels and large-diameter trunk mains. The raft is released upstream and carried by the flow, eventually retrieved at a downstream location using a hook or net—sometimes many kilometers away. Inspection rafts are engineered to remain upright and balanced throughout their journey, ensuring consistent video capture over vast distances.

The evolution of UAV technology has opened exciting new doors for pipe inspection. Over recent years, the use of drones inside pipelines has grown significantly, offering clear advantages in scenarios where traditional methods fall short.

Drones excel in large pipes with strong flow conditions that would prevent a crawler from entering or cause a raft to move too quickly. They are also ideal for long-distance inspections where the weight and length of a tethered cable become impractical. As this technology continues to mature, it's poised to become a standard tool in the pipeline inspection toolkit.

A growing number of dedicated cameras are now available for inspecting the vertical shafts of manholes and maintenance holes. These systems capture photos, video footage, and even 3D scans of the shaft interior—from the surface down to the benching and pipe channel.

Previously, this kind of assessment was handled through basic visual inspections, standard cameras, or by piggybacking on a crawler unit during a mainline inspection. Today, purpose-built manhole cameras deliver far greater resolution and detail, enabling more accurate condition reporting than ever before.

Hydro jetting is a common pipe cleaning method used to blast away sediment, obstructions, grease, fats, oils, and root intrusions. Some hydro jetters now come equipped with a built-in nozzle camera, combining cleaning and inspection into a single pass.

These cameras guide the operator through the pipe, helping to pinpoint specific blockages and even navigate into lateral lines. Once cleaning is complete, the jetter nozzle camera can also record follow-up footage to verify the effectiveness of the job and document the pipe's post-cleaning condition.