Glenlee Power Station
The 12MW Glenlee hydro-electric power station in Scotland is part of the 106.5MW Galloway Hydro-Electric power scheme, which was the first large scale integrated hydro-electricity supply complex in the UK when it was built and commissioned in the mid 1930s. A 60km long network of lochs, dams, tunnels, aquaducts, pipelines and rivers interconnect six power stations in a cascade system, which reuses the water several times for power generation. Each station reuses the water that has been discharged by the one above to generate electricity.
Glenlee is the fifth of the six power stations in the interlinking renewable energy scheme that
covers a large area of Galloway and South Ayrshire. Water for Glenlee Power Station gathers
in Loch Clatteringshaws and flows through a 6km long tunnel to a portal control valve above
the power station. From here water plunges 125m down the hillside through a 570m long steel
penstock of varying diameter to the station’s twin 6MW turbines and out of tailrace valves and
into a spillway, for discharge into the River Dee.
The Glenlee penstock was in need of cleaning and repainting and power station operator Scottish
Power Generation Ltd awarded a contract for its refurbishment to the specialist contractor
Concrete Repairs Ltd based in Falkirk. The flange bolted steel pipeline had not been cleaned and
painted internally for over 70 years, since it was installed in the 1930s. CRL believed the internal
cleaning and paint removal could be done with high-pressure water jetting and contacted
N.E.T. Waterjet Ltd.
N.E.T. used its new Conjet 324, with optional rotor head, which arrived on site in May 2010, to
remove the build up of debris and old paint coating up to 4mm thick. The company had about
4,200m2 to clean from the inner surface of the penstock in diameters from top to bottom
of 3m, 2.7m, 2.4m and twin 1.8m and on varying gradients from 1:100 up to the steepest 18 degrees.
CRL removed the flange bolted expansion joints and butterfly valves in the penstock to provide N.E.T. access at several points for the Conjet 324, which was supplied with water at a pressure of 2,500 bar and flow of 25 litres/min from one of N.E.T.’s existing 250kW Hammelmann 120 high-pressure pumps.
There was no dust from the paint removal and the waste water and debris from the Conjet Robot cleaning process flowed down the penstock and was collected by CRL in a sump in the turbine house. It was then pumped into tankers for off site environmental treatment and disposal.
Glasgow Car Park
Removal of 10,000 m2 of concrete screed from the roof of a public car park in Glasgow for Land Engineering. This was followed by removing the waterproof membrane and surface preparing the roof deck for Site Sealants who re-applied a new membrane.
Dollon Aqua Centre East Kilbride
Involved in the major refurbishment of the Dollon Aqua Centre, East Kilbride, which is a 20th century A listed building, which opened in 1968, and will be a key venue for the International Children’s Games in 2011. Clark Contracts asked N.E.T. Waterjet to remove the epoxy tile adhesive from the walls and floors of the pool at the end of 2009 and in April 2010 asked our company to return on the instruction of their client, South Lanarkshire Council, to remove the cementitious epoxy screed from the pool back to the main structure.
The Gyle Edinburgh
The deck blast with full vacuum recovery has been used to remove adhesive and epoxy floor paint from Industrial Unit floors at the Gyle, Edinburgh. Using this same equipment we carried out the floor screed removal around the fermentation tanks at a distillery in Aberdeenshire. The success of this contract allowed us to return to carry out work with a different UHP application to clean and polish inside the stainless steel syrup pipes.
Clyde Wind Farm
At Clyde Wind Farm we successfully removed a concrete plug from an electricalcable duct at a turbine base for C.A. Blackwell.
Aberdeen and Dundee Dry Docks
Working in both Dundee Dock and Aberdeen Dry Dock, we have used UHP to remove the protective coatings from hulls, decks and tanks on a variety of vessels.
Using our sawing and coring equipment we were involved in floor sawing expansion joints and diamond core cutting at a new egg production facility at Thornton in Fife.
Wind Turbine Base
April 2011- Concrete was to be removed leaving the rebar insitu.
N.E.T.Waterjet Ltd was awarded the contract and using their Conjet 324 Robot and a 340hp
waterblast unit, running at 120 litres/min, the work was safely carried out. Using the robot
increased the volume of removal, and the Robot was able to operate both from the outer
ring and within the centre of the base. This reduced any hand lance work, using a 125hp
waterblast unit, to a minimum on inaccessible areas. The main benefits of the Conjet 324
Robot are its versatility and manoeuvrability along with alleviating labour fatigue and the
associated safety risks.
LSA/NORM Scale Removal and Tube Bundle Cleaning – May 2011
Carrying out work at an Oil Terminal to safely remove LSA/NORM scale from pipework.
Using the Peinemann single lance system to efficiently carry out tube bundle cleaning.
The Peinemann enhances the safety aspect for the operator.
Galliford Try –Warrington – June 2011
Cutting recessed rings in core holes varying in size from 200mm to 350mm.
This was carried out over approximately 1500 core holes for a new community
hub in Warrington. Steel piles were driven down 10m through the core holes.
These piles were then filled with concrete and the recessed rings act as shear lugs.
© NET Waterjet, Unit 1, Mid Friarton, King James Business Park, Perth, PH2 8EL
|Road Line Marking and Floor Coating Removal|
|Robotic Demolition and Surface Preparation Equipment|
|Heat Exchanger, Condenser & Tube Bundle Cleaning|
|Drill Pipe Cleaning & LSA/NORM Scale Removal|
|Coring and Floor Sawing|
|WJA Training Provider|