The Offshore Installations (Safety Zones) (No. 3) Order 2017. Comes into force 6th July. This Order establishes, under Section 22 of the Petroleum Act 1987, safety zones having a radius of 500 metres from the specified point around the four installations (which are subsea installations). The installations are; Kraken Drill Centre 4, Block 9/2b, Kraken Field, Horne and Wren, Block 53/3c. Horne and Wren Field, Edradour PLEM, Block 206/4a, Edradour Field and Lancaster Manifold, Block 205/21a, Lancaster Field.