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Installation of piggybacked production pipeline between the F-O drilling field and its FA production platform for the Mossel Bay gas-to-liquids (GTL) refinery in South Africa’s Western Cape.
Company: PetroSA
Location: Mossel Bay, South Africa
160 m
Max. water depth
Scope of work
- Procurement (incl. pipeline anodes, piggyback blocks, strapping & heat shrink sleeves)
- Fabrication of installation aids, pipeline heads, flange assemblies, cocoons & sleepers
- Welding trials & qualifications
- Installation of 37-km, 12-inch production pipeline (incl. 4-km cladded section)
- Installation of 37-km, 3-inch MEG pipeline piggybacked onto 12-inch pipeline
- Flooding, gauging & hydro-testing of 12-inch line
- Flushing & hydro-testing of 3-inch MEG line
- Survey support & free span rectification
37-km
3-inch MEG pipeline piggybacked onto 12-inch pipeline
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Specials & challenges
- Qualify & weld 12-inch cladded pipe (incl. engineering critical assessment)
- Digital X-ray in combination with internal welding inspection tool (IWIT) for 12-inch cladded pipe
- 3-layer heat shrink sleeves (HSS) field joint coating, requiring liquid epoxy primer with curing at 180 ºC
- Piggyback blocks for sliding piggy-back pipeline mechanism due to large expansion differences
- Supply and pipeline flooding of 3500 m³ potable water
- High pressure hydrotest at 533 bar (in-house design) to accommodate 5-layer syntactic polypropylene flowline insulation
533 bar
High pressure hydrotest
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