Scope
The repair scope had the following specifications:
| Structure | Underground firewater system |
| Line Media | Water |
| Design Pressure | 1,809kPag |
| ANSI Rating | CI#150 |
| Design Temperature | 60 °C |
| Design Code | ASME B16.5 |
| Schedule / Wall thickness (WT) | 7.04mm to 8.38mm |
| Material and Grade | A53GR B |
| Flange materials/specification | A105N (Quickflange material) |
| Geometory | Connections for new spool - underground |
| Orientation | 3 x horizontal and 1 x vertical |
Overview
An underground firewater system required a connection spool to be inserted. The location was within a live gas plant so required a no hot work approach. Four flanges, two at DN200, one at DN250 and one at DN300 were required to be installed, with associated onsite machining to be provided.
Solution
- 8”, 10” and 12” flanges specified and tested through DNV approved process
- Onsite machining tooling and technicians provided in one mobilization of a crew of 2
- Flexibility to fit within larger site crew, helping out with all tasks associated with the job to optimize the job schedule
Benefits
- No hot work
- Flexibility in the methodology to address latent conditions and residual stresses in the pipework
- Short time on site, 5 days with 2 technicians to complete 4 flange installations.
- No welding preparation, inspection or habitat requirements
Project Images
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