Water Mains

Fire Tank and Temporary Water Supply Installation

Watford

Fire tanks at the Watford site with barriers in place and the excavation open alongside

Overview

Our team was initially contacted by a client in Watford who had been experiencing issues with their on-site fire tanks, which had not been filling with water. Following a thorough investigation, we discovered that the water board had previously cut off the tanks’ main inlets, leaving them completely dry and non-operational for the past three years.

In addition to restoring the fire tanks, the site also required a new temporary water connection for a separate company occupying a newly built unit on the premises. This connection would ensure a reliable water supply while the application for a brand-new permanent supply pipe was being processed.

Our solution

We proposed a comprehensive package of works to restore full functionality to the site’s water system and fire safety infrastructure. The plan included installing a temporary overland supply from an existing building to the new unit, allowing water access during the interim period; creating a 63mm dedicated connection to the two fire tanks, enabling them to be fed separately and ensuring the site could regain insurance compliance; and managing all applications, communications and approvals with the local council, traffic management teams and the water board to streamline the entire process.

A detailed site visit was arranged to walk the customer through the self-lay process and explain how we manage every stage of the scheme — from permits to completion — to minimise disruption. Once the proposal was agreed, we produced all relevant RAMS, a build plan and a schedule of works, while progressing the Section 50 permit and water board application.

Project delivery

The works were carefully scheduled to accommodate other ongoing projects at the site. We initially allocated two weeks for the on-site work and three days for the off-site section. Our skilled engineers completed the on-site work within just seven working days and the off-site connections within the planned three-day period.

After completing the mains lay, we successfully commissioned the pipework, carried out pressure testing, and obtained all necessary passed water samples. The system was then fully connected, restoring water supply to the tanks and confirming full functionality. All details and results were provided to the water board for final verification and sign-off.

Scope of works

  • Installed 25mm MDPE overland temporary supply to the new building, as confirmed with the water board
  • Installed 160m of 63mm barrier pipe water mains using fusion weld and Protectaline fittings
  • Installed 180m of 32mm barrier service pipe to the new unit
  • Installed meter and brass stoptap on the 32mm supply
  • Installed double check valve and brass stoptap on the 63mm fire tank supply
  • Installed 2 x new sluice valves on the tank inlets
  • Completed 2 x under-pressure mains connections under two-way traffic lights
  • Full backfill and reinstatement carried out both on site and off site
Route of the new main and service marked out on site before any excavation
Floor saw cutting the line for the new water main across hardstanding
Marked route for the new water main running across paving slabs
Open trench excavated for the new 63mm barrier pipe water main
Trench for the new water main with site barriers in place alongside the building
Depth of cover measured in the mains trench against a graduated staff
Blue barrier pipe water main laid along the base of the trench
Barrier pipe water main in the open trench before backfill
Water main and 32mm service pipe run together in a shared trench
Service pipe run along the building line towards the new unit
Temporary overland supply run to the newly built unit
New sluice valve installed on one of the fire tank inlets
Completed connection feeding one of the two fire tanks
Fire tanks with barriers and traffic management in place during the works
Road plates over the excavation to keep the site running during the works
Reinstated route alongside the building after the mains lay
Reinstatement completed at the end of the Watford scheme
Discipline
Water Mains
Location
Watford

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