Broken Scar in Darlington is one of the principal Northumbrian Water Water Treatment Works, serving the population of Darlington, Stockton and parts of Middlesbrough.
It has a nominal capacity of 180 MLD, extracting raw water from the River Tees and using clarification and filtration stages along with associated chemical dosing prepares the water prior to distribution.
A large works such as this requires bulk storage of materials such as flocculants – in this case Ferric Sulphate which was stored in three 60m3 Vertical Cylindrical GRP Storage Tanks.
Following a catastrophic failure of 2 of these vessels in early 2004 the works was left with no bulk capacity of this chemical and was relying on a daily succession of road tankers to keep treatment operating.
Chem Resist worked closely with a consultancy group to provide an alternative of all thermoplastic spiral wound tanks to GRP storage vessels.
This included providing vessels of the same height and diameter of the failed vessels so existing plinths could be utilised, access ladders and interconnecting walkways and delivery and installation of the vessels.
By September 2004 all three storage tanks were installed and commissioned.