PULBOROUGH, UK – Hughes Pumps has supplied a water-jetting system to support corrosion prevention maintenance on the semisubmersible drilling rig Stena Spey.
The Hughes Pumps Ultrabar 10 system is being used to strip corrosion and failed coatings from structure of the rig, based in Aberdeen using plain water.
It comprises an Ultrabar 10 EC UHP water jetting unit rated at 8.3l/m at 2,500 bar (2.2g/m at 36,000 psi); a 45-kW (60-hp) electric motor and starter panel for use in a safe area, crash-frame mounted, and measuring 1.8 m long, 1 m wide x 1.5 m high, with a weight of 1,100 kg (71 x 39 x 59-in., with a weight of 2,420 lb).
For this application Hughes supplied a simple dump gun with a new design of self-rotating surface preparation nozzle, suited to the very low flow rate required, and equipped with the smallest Ultrabar 10 pump. This innovation, the company claims, has resulted in a significant simplification of the unit, eliminating the need for on-site compressed air and a reduction in routine UHP accessory maintenance.
Until recently, complex, maintenance-intensive, compressed air driven rotary guns and UHP dump valves had been the only option in this type of application, the company claims.