RAVVA CALM
Scope of Work
SOFEC supplied a 12.5m diameter CALM buoy from its stock buoy program to replace a non-SOFEC® buoy that had experienced premature failure in service.
General Description
| Client Name: | Cairn Energy India Pty. Ltd. |
| Contract Award: | October 1998 |
| Installation Date: | November 1998 |
| Application: | Crude Oil Export |
Project Specifications
| Water Depth: | 25m (82ft) |
| Tanker Size: | 120,000 dwt |
| Dimension: | 12.5mØ x 5.3m |
| Floating Hose: | 1 x 20-in. |
| Underbuoy Hose: | 1 20-in. Steep S |
| Hawser System: | 13-in. Single grommet |
| Anchor Leg System: | 6 x 3-in. Stud link |
| Anchor System: | Unavailable |
Design Environmental Criteria
Operational
| Significant Wave Height: | 3.5m (11.5ft) |
| Wind Velocity: | 15m/s (29 knots) |
| Surface Current: | 1.3m/s (2 knots) |
Survival
| Significant Wave Height: | 9.5m (31ft) |
| Wind Velocity: | 36m/s (70 knots) |
| Surface Current: | 2.3m/s (4.5 knots) |
Comments
When Cairn Energy India experienced a catastrophic failure of a competitor’s buoy, SOFEC was awarded the task of replacing the buoy. Located in 25m water depth, the CALM buoy accommo-dates 120,000 dwt tankers. SOFEC’s buoy serves to export oil production from Cairn Energy’s RAVVA Field off the East Coast of India.
Using specially engineered excursion limiters, SOFEC successfully fitted its CALM system to the existing six-leg anchor chains.