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Siyazan district · Onshore

Flowline replacement in Siyazan

Old flowlines removed and replaced with factory-coated pipe, every weld tested

Client
The national oil company’s onshore division
Period
September 2025 – March 2026 (7 months)
Most people on site in a day
64
Man-hours
212,000
Lost-time injuries
0
An excavator digging a deep trench lined with a trench box

The brief

Some of the Siyazan flowlines dated from the 1970s and had worn down to 3 mm wall in places. The client asked us to remove and replace the lines that connect 42 wells to the gathering stations, test every weld and put the new lines under cathodic protection.

In figures

of 6 to 10-inch flowline replaced
18.4km
made, all ultrasonically tested
2,140welds
of welds sent for repair
1.8%

How the work went

  • The old lines came out section by section: each new section was ready alongside before the old one was shut in, so no well stood for more than 36 hours.
  • Four welding crews on Pipeliner 200D sets averaged 19 welds a day.
  • Every weld was tested with the OmniScan; reports went to the client’s inspector the same day.
  • Each section passed a 24-⁠hour hydrotest before the cathodic protection was surveyed.

Result

Handed over in 7 months, 11 days ahead of plan; 212,000 man-hours without a lost-time injury.

The client’s words
Replacing the lines without stopping the wells made for a tight schedule, and every week’s plan was met.

The client’s project manager

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