Paragraph 4 Detailed offshore design parametersI1
England, Wales and Scotland
The total number of offshore platforms forming part of the authorised scheme must not exceed 7 comprising—
up to 4 offshore collector platforms;
up to 1 offshore converter platform;
up to 2 offshore accommodation or helicopter platforms,
provided that any of the platforms comprised in paragraphs (a) to (c) may be co-joined to create a combined platform fixed to the seabed by multi-leg or gravity base type foundations.
The dimensions of any offshore collector platforms forming part of the authorised scheme (excluding towers, helicopter landing pads, masts and cranes) must not exceed 75 metres in length, 75 metres in width and 85 metres in height above HAT.
The dimensions of any offshore converter platform forming part of the authorised scheme (excluding towers, helicopter landing pads, masts and cranes) must not exceed 125 metres in length, 100 metres in width and 105 metres in height above HAT.
The dimensions of any offshore accommodation or helicopter platforms forming part of the authorised scheme (excluding towers, helicopter landing pads, masts and cranes) must not exceed 125 metres in length, 100 metres in width and 105 metres in height above HAT.
The dimensions of any combined platform forming part of the authorised scheme (excluding towers, helicopter landing pads, masts and cranes) must not exceed the total footprint of the individual platforms incorporated within it.
Offshore platform foundation structures forming part of the authorised scheme must be 1 of the following foundation options: gravity base or multi-leg.
No offshore platform foundation structure employing a footing of driven piles forming part of the authorised scheme must—
have more than 24 driven piles;
have a pile diameter of greater than 2.744 metres or employ a hammer energy during installation of greater than 1,900 kilojoules.
No offshore platform foundation must have a seabed footprint area of subsea scour protection (excluding foundation footprint) of more than 8,742 square metres.
The foundations for offshore platforms must not exceed the dimensions set out below—
| Foundation type | Offshore collector platform (multi-leg or gravity base foundation) | Offshore converter platform (multi-leg or gravity base foundation) | Offshore accommodation or helicopter platform (multi-leg or gravity base foundation) |
|---|---|---|---|
| Maximum seabed footprint area per foundation (excluding scour protection) in square metres | 5,625 | 12,500 | 12,500 |
The number of vessels actively carrying out impact piling as part of the installation of driven pile foundations for the authorised scheme must at no time exceed 2 within Work No. 1A.
Annotations
Commencement
- I1
Sch. 8 para. 4 in force at 11.3.2015, see art. 1