Underground Sprinkler Pipe Survey, Leeds

The Scope

When underground infrastructure begins to fail, locating the exact position of buried services quickly becomes essential. At a city centre site in Leeds, our client required an underground sprinkler pipe survey after a leak was discovered within its sprinkler system. The suspected pipe corrosion raised concerns around maintenance responsibilities, asset ownership, and the potential disruption that further investigative works could cause if the pipe route was not accurately identified.

We were instructed to carry out a GPR Survey to identify the location of the buried sprinkler pipework, associated valves, and related inspection chambers across the survey area. The survey focused specifically on tracing the underground sprinkler infrastructure rather than delivering a full utility mapping survey of the wider site.

The client needed dependable information to support further investigations and determine responsibility for repairs. With buried services running through a busy city centre location, having accurate underground utility data was vital before any excavation or remedial work could begin.

Our team carried out the underground sprinkler pipe survey in line with PAS128 methodology standards, ensuring a structured and reliable approach to underground utility detection and mapping. Although a desktop utility search had not been provided within the required timeframe for formal certification, the survey itself was completed in accordance with PAS128 principles to provide the client with the most accurate information possible.

The primary objective was to detect, record, and map the underground sprinkler pipework requested by the client. To achieve this, our survey team used electromagnetic location techniques with a Vivax vLoc3-Pro receiver and transmitter system.

Direct electronic connections were made to accessible water features and associated infrastructure to trace the metallic sprinkler pipework as accurately as possible. Because the pipe was metallic, signal transfer was highly effective, allowing the team to obtain reliable positional data across the site.

The survey identified multiple sprinkler valves, sluice valves, and associated pipe routes throughout the area. The traced pipework was mapped and delivered within detailed survey drawings that included depths, approximate routes, and quality level classifications for the detected services.

Ground Penetrating Radar was initially considered as part of the investigation process. However, due to space constraints within the site environment, GPR methods could not be effectively deployed. Instead, alternative detection techniques were used to ensure the required data could still be captured efficiently.

Our client’s main concern was determining who owned the leaking sprinkler asset and whose responsibility it was to carry out repairs.

By providing mapped evidence of the pipe route, valve locations, and associated infrastructure, the survey gave them valuable information to support maintenance discussions and future repair planning.

The drawings and reports could also be used as supporting documentation when consulting contractors, insurers, or legal teams regarding asset responsibility. Having professionally surveyed underground information available reduces reliance on assumptions and allows stakeholders to make more informed decisions much earlier in the process.

One of the biggest advantages of the survey was the accurate geolocated positioning of the underground sprinkler pipe network.

Without reliable underground utility data, excavation work can become high risk, particularly within busy commercial environments where buried assets may not appear on existing records. By tracing the sprinkler pipework and locating associated valves, the client gained a much clearer understanding of the asset layout beneath the surface.

This information significantly reduced uncertainty before any repair works began. The survey drawings also provided depth information and quality level classifications, helping contractors and maintenance teams plan investigations more safely and efficiently.