RISER AND SPOOL SECTIONAL REPAIR-8in

DETAIL PROJECT
Project
8in MGL YA-B1C Riser and Spool Sectional Repair
Client
Pertamina Hulu Energi ONWJ
Location
Offshore North West Java, Indonesia
Duration
10 days fixed shutdown duration
Year
April 2017
Mode of Intervention
Subsea IMR 2015-2017 (Saturation Diving
Water Depth
40.5m
WORKSCOPE SUMMARY

PHE ONWJ required a riser and spool sectional repair at 8in MGL YA-B1C the existing line (10 days fixed shutdown). It was found several defects exceeding the maximum allowable longitudinal extend of corrosion. Since leak cannot be repaired by clamp, the riser and spool needs to be replaced to secure the production target of Bravo Field.

Therefore OSI replace 8in MGL YA-B1C riser and spool as per client instruction. OSI utilized DPII DSV Crest Odyssey 1 saturation diving. The scope of work consisted of:

  • Pre-shutdown (Positioning and trial, as found survey)
  • De-oiling & Isolation Shutdown
  • Seabed/pipeline preparation and etc)
  • 8in MGL YA-B1C Existing riser and spool removal
  • New 8in MGL YA-B1C riser and Spool Installation
  • Tensioning & KaMOS Gasket Test
  • As Built Survey.