Project Detail

Network Rail Canton Depot – Water main replacement and segregation of current supply

Network Rail owns, operates and develops Britain’s railway – the 20,000 miles of track, 40,000 bridges, tunnels and viaducts and the thousands of signals, level crossings and stations.  Network Rail’s role is to deliver a safe and reliable railway every day for the four and half million people and businesses who rely on it.

63mm
Access Ramp Works
Access Ramp Works
Access Ramp Works
Access Ramp Works

Client :                 Network Rail 

Location :           Canton Depot, Cardiff

Value :                   < £250,000

Remarks :            The remit of the MECX team was to renew the pipe-work serving the existing domestic water supplies at the Canton depot and at the Network Rail Maintenance Delivery Unit (MDU). Thus, separating the ATW depot from the existing water mains which was shared at the time, with the adjacent Colas Rail depot (the former EWS Site).

Overview

Network Rail owns, operates and develops Britain’s railway – the 20,000 miles of track, 40,000 bridges, tunnels and viaducts and the thousands of signals, level crossings and stations.  Network Rail’s role is to deliver a safe and reliable railway every day for the four and half million people and businesses who rely on it.

High water consumption

There has been a locomotive depot at Canton in Cardiff since 1882. Arriva Trains Wales (ATW) now use the 6.1-hectare site to clean, maintain and refurbish their fleet.  They had a requirement for high water consumption, but their supply delivery system at the time had a history of leaks and low pressure. In addition, the system formed a ring main with the adjacent former EWS freight depot.

This remit was concerned with the renewal of the pipe-work serving the existing domestic water supplies at the depot and at the Network Rail Maintenance Delivery Unit (MDU). Thus, separating the ATW depot from the existing water mains which was shared at the time, with the adjacent Colas Rail depot (the former EWS Site).

A new water connection

Network Rail contracted with MECX to provide a new water connection to the MDU.  We made the connection into the existing Welsh Water mains network at Leckwith Road, which is adjacent to the MDU.  A summary of the work is follows:

  • A metered connection to serve domestic water at the ATW Depot and the Network Rail MDU.
  • Provided and installed water pipe-work to serve existing domestic and process water supplies in and around the ATW depot.
  • Separation of the ATW depot from the current shared Colas Rail and ATW depot water supply with a suitable termination fitting.
  • Installation of a ductile iron connection pipe linking the eastern and western legs of the existing ring main.
  • Redundant pipe-work and fittings within the ATW shed was disconnected and removed, while redundant pipe-work and fittings were removed from site and disposed of.
  • All spoil from excavations was treated as contaminated material and was disposed of at an approved facility.

Contingency measures put into place

We put contingency measures into place prior to the changeover to ensure uninterrupted depot operations, to mitigate any potential issues that might have arisen during the works.

Following completion of the civils and mechanical works, the completed water installation was chemically cleaned and then flushed out with clean water. On completion of the cleaning and flushing the pipe-work was recharged with clean water and tested to ensure that it is absolutely water tight under working conditions with all draw off taps closed.

Water main and service pipe-work shall be subjected test pressure greater than the maximum working pressure. This pressure shall be maintained for a stipulated period of time in line with the British Standards.

Following these tests, the pipe-work was sterilised by the application of chlorine, and the pipe-work was then flushed out with clean water.

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Network Rail
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