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Precise Measuring

Project: Millenium Main
Scope: To Establish Precise alignment of pipe sections
Location: Central London

Upon completion of the PPR works, we modified one of our long-range crawlers to house and control a LiDAR head to facilitate the precise measuring of individual pipe sections to assess sequential alignment and measure for ovality.

The remit was to identify if there was deflection exceeding 1 degree between each of the GRP liner sections for the total length of the pipe.

To do this an incredibly accurate 3D model of the water main was produced using a high-definition LiDAR scanner. Each section required manual interpretation of the recovered data to determine the precise angle of deflection in both the horizontal and vertical plane.

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This was a vital element of the project and at the time the technology was unavailable. The team and their specialist supplier worked out a methodology that would deliver the critical data in a timely manner, so as not to impact on the project program. As with the previous works, the accuracy of the information delivered enabled key decisions to be made on the project delivery. Their level of support and expertise is second to none and they are a pleasure to work with.

Paul Garland, Project Manager – Morrison WS

FAQs

Frequently Asked Question

What was the objective of this survey?

To measure the sequential alignment of GRP liner sections on the Millenium Main in Central London and check ovality, flagging any > 1° deflection between sections.

A long-range crawler was adapted to carry a high-definition LiDAR head, producing a very accurate 3D model for measurement.

Mounting the LiDAR on a crawler enabled internal, continuous capture along the main with stable geometry and minimal disruption.

Each pipe section was manually interpreted from the point cloud to calculate horizontal and vertical angular deflection between adjacent liners.

The workflow targeted millimetre-level registration suitable for reliable <1° angular checks and repeatable ovality measurements.

A concise report with deflection results per joint, ovality metrics, annotated visuals and the registered 3D model for engineering review.

Yes—setups are configurable for different diameters and materials where internal access allows.

Pipe diameter/material, expected joint spacing, access points, any tolerances to check (e.g., >1°), and required deliverables/formats.