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Liverpool Actiflow Diversion

Work is progressing on the  £200 million extension to the Liverpool Wastewater Treatment Works (WwTW) on the banks of the River Mersey, which will see a much cleaner river and assist in the regeneration of Liverpool’s economy by helping to attract tourists and businesses to the waterfront. United Utilities that own the site is on target to have the new plant operational by early 2016.

Franklyn Yates Engineering secured the Actiflow Diversion Pipework project with the GCAJV (Galliford Try, Costain, and Atkins JV). This project includes the relocation of several pipework systems as detailed in the task tab.



  • Removal of DN1000 scotchkote pipework
  • Design / drawings of re-routed DN1000 Actiflo pipework
  • Manufacture of new DN1000 scotchkote pipework
  • Installation of new DN1000 pipework
  • Installation of existing (reused) DN1000 valves and inline flowmeter
  • Service testing


  • Design / drawings of re-routed DN150 stainless steel final effluent pipework
  • Removal of DN150 stainless steel pipework
  • Manufacture of new DN150 stainless steel pipework
  • Installation of new DN150 stainless steel pipework
  • Testing of pipework
  • Lagging and trace heating


  • Design / drawings of re-routed DN200 scotchkote pipework
  • Removal of existing DN200 scotchkote pipework
  • Manufacture of new DN200 pipework
  • Installation of new DN200 pipework
  • Testing of pipework
  • Lagging of pipework


  • Design / drawings of relocated staircase, step over platform and handrail modifications
  • Removal of existing steel work
  • Manufacture of new steelwork
  • Installation of new steelwork


This project consisted of the rerouting of a large section of DN1000 scotchkote pipework; although this was only a small project in comparison to our regular projects it was quite a complex one with regards planning and management due to various shutdown restrictions. FYEL worked alongside GCA/JV and united utilities to develop a detailed strategy and engineering solution to deliver the works within the restricted shutdown periods.

FYEL firstly had to modify items of steel work to make way for the DN1000 pipework and in turn make alterations to two other pipework systems. FYEL took the decision to renew the entire length of the Actflo DN1000 pipework as appose to reusing certain sections. This enabled the pre installation of key sections of pipework prior to the shutdown of the system. Working around the clock and well into the night FYEL delivered the project in the allotted time frame; in fact the system went back on line and was fully operational eight hours ahead of schedule.

If you would like to find out more information on the overall works completed on site you will find a useful case study on the link below

Liverpool Actiflow Diversion

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