BLUNOX SCR System retrofitted offshore on 'Mærsk Innovator', one of the world's largest jack-up drilling rigs

Drilling rig: Mærsk Innovator
Rig owner: Maersk Drilling
Operator: Leading, global oil company
New build/retrofit: Retrofit
Number of SCR systems installed: 4
Engine Installation: 4x MAN-B&W Holeby 9L27/38
Fuel Type: MGO
Exhaust Temperature: 290-330o C
NOx reduction: IMO Tier 3 compliance

About the rig

The Mærsk Innovator is one of two identical ultra harsh environment jack-ups in Maersk Drilling's fleet. These rigs are the largest and most advanced jack-up rigs in the world. With a leg length of 205.3 m (673 ft) the rig is designed for year-round operation in the North Sea, in water depths up to 150 m (492 ft).

Key results

 NOx reduction of 97%
 Systems delivered on-time and on-budget
 No complete power-out during retrofit installation. 2 of the rig's 4 engines were always online and available during retrofit installation.
 Down-time during installation on engines being retrofitted were less than 3 days end-to-end including cutting down and removal of the old exhaust systems.

Included in the delivery

 SCR systems for NOx reduction
 Integrated silencers for full-spectrum 35 dB(A) noise attenuation
 Supporting structures in which the SCR solution is held
 Urea supply system including BLUNOX offshore urea container tanks with a capacity of 9,000 litres, day-tank and buffer-tank as well as urea filtering system.
 Customized concept and detailed design for Mærsk Innovator
 Manufacturing, on-shore assembly and logistics
 Offshore retrofit installation while Mærsk Innovator was in normal operation

Authorities and compliance

The systems were successfully installed and commissioned in late autumn 2013, with a NOx reduction measured by the Norwegian authorities at an impressive 97%.

The BLUNOX delivery was fully ‘turn-key’ and especially designed for the tough offshore environment of the North Sea and in compliance with NORSOK standards.

The installation was supported by the Norwegian Business Sector’s NOx Fund whose main task is to finance specific NOx-reducing initiatives with focus on long lasting measures.


BLUNOX SCR Systems for up to 97% NOx reduction