General Fixed Platform Installation is divided into 3 (three) methods: 1. Lifting; 2. Launching; 3. Float-over.

Tanya – muhammad yusuf

General Fixed Platform Installation is divided into 3 (three) methods:

1. Lifting

2. Launching

3. Float-over

1. Lifting:

a. Vertical Lifting

– Fabricate & transport by vertical

– Lift vertically from cargo barge then emplace into its position

b. Upending

– Fabricate & transport by horizontal,

– Then lifting horizontal then upending gradually until vertical (Assisted by flooding system if necessary)

– Then vertically emplacing to sea bed. (Assisted by flooding
system if necessary) – Applicable for jacket (not topside)

2. Launching: (applicable only for jacket)

a. Free launching.

– Fabricate & transport by horizontal

– After launching from launch barge (specific trim angle), jacket will go into water,

– Then by buoyancy and structural configuration, the jacket will be automatically positioned into vertical floating condition

– Then crane will pick up the sling and emplace ther jacket vertically to sea bed.

b. Typical launching plus controlled upending.

– Fabricate & transport by horizontal

– After launching from launch barge (specific trim angle), jacket will go into water, but it will be floated in horizontal position,

– Then it will be towed into final location (as necessary)

– Then it will be upended up to vertical position (assisted by flooding system)

– Then it will be emplaced vertically (assisted by flooding
system)

3. Float-over (applicable only for topside)

a. Typical float-over.

– Topside is positioned on skid beam float-over barge

– Then float-over barge move into final position,

– then by ballasting, topside leg will be positioned above pile/transition piece (above leg)

b. Float-on and float off method.

– Topside is positioned on top of cantilever beam above float over barge,

– Then topside is skidded up to edge of cantilever beam,

– Then by ballasting, topside leg will be positioned above pile/transition piece (above leg).

Note. Float-on and float-off method is useful for condition of topside removal and then re-installation.

topside removal by this float-on float off method will be a reverse sequence from the installation as above.