Diverless pipeline repair clamp: Phase 2
- Stress Engineering Services, Inc., Houston, TX (United States)
The objective of this project sponsored by the Pipeline Research Committee of the American Gas Association, is to develop a system suitable for repairing small leaks on deepwater pipelines. Phase I of the project, completed in 1990 by Stress Engineering Services, Inc. investigated the types of problems that would have to be overcome to effect a diverless clamp-type repair. Several repair systems were investigated and ten mechanisms were proposed that could be used to secure two clamp halves together. This current Phase 11 effort, is to take two most promising clamp concepts from Phase 1, further evaluate hardware and installation issues, develop conceptual designs, and determine which concept should be carried forward to detailed design. The two concepts evaluated were (1) a bolted split-sleeve clamp suited for ROV installation, and (2) a hydraulically self-actuating clamp requiring only placement on the pipe and actuation by ROV hydraulic hot stabs. Both concepts were evaluated for a 12-inch (324 mm) nominal pipe diameter with an ANSI 900 (15.3 mPa) pressure rating, presuming either system could be adapted to a wider range of pipe sizes and design pressures. Based on the results of this investigation a modified bolted split-sleeve clamp was recommended over the hydraulically self-actuating clamp. The main reasons are (1) the bolted split-sleeve clamp can be adapted to installation by a ROV, (2) sealing and clamping mechanisms borrow from available proven technology, (3) it would require less development effort than the hydraulically self-actuating clamp, and (4) the bolted split-sleeve clamp would probably result in a simpler, less costly design.
- Research Organization:
- American Gas Association, Inc., Arlington, VA (United States). Pipeline Research Committee; Stress Engineering Services, Inc., Houston, TX (United States)
- Sponsoring Organization:
- AGA; American Gas Association, Inc., Arlington, VA (United States)
- OSTI ID:
- 6779976
- Report Number(s):
- AGA-93007082; CNN: PR-201-019
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diverless pipeline repair clamp, Phase 3
Diverless pipeline-repair system passes tests for 20-in. pipe