Drax is the largest coal-fired power station in the UK with a total capacity of just under 4000 MW
Drax is the largest coal-fired power station in the UK with a total capacity of just under 4000 MW. When originally built in 1974 it had three 660 MW turbines and in 1986, three more were added. With its flue gas desulphurisation equipment it is the cleanest coal-fired station in the UK and generates about 7 per cent of the UK’s electricity. It is owned by Drax Group plc.
Metalock’s workscope for each turbine, consisting of 3 LP’s per turbine involved:
- Deepening the existing grooves (carrier seats) in rows 1 and 2 in both top and bottom casing halves on LP1, LP2 and LP3, to accept larger blades in that area of the turbine.
- Also exhaust areas were machined on LP1, LP2 and LP3 to provide greater clearance in the casing so that bigger blades could be installed at the exhaust ends of each LP.
- To enable the fitting of new bearing keeps Metalock has drilled and tapped a series of new M56/M64 holes in the 6 bearing pedestals.
- Additionally, carrier seat faces were drilled, tapped and dowelled to permit anti-rotation keys to be fitted in top and bottom halves of each LP Exhaust machining LP casing machining with 250mm diameter boring bar Three casing covers and Metalock’s purpose-designed boring bar.