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SAFETY
ALERT |
PACIFIC OCS REGION |
U.S. DEPARTMENT OF THE INTERIOR /
MINERALS MANAGEMENT SERVICE
![tribar.gif (1894 bytes)](https://webarchive.library.unt.edu/eot2008/20090114221031im_/http://www.mms.gov/omm/pacific/images/tribar.gif)
Notice
No. 6
May
15, 1991
PIPELINE DAMAGED BY GRAPPLING
HOOK
During a recent anchor retrieval operation adjacent to an OCS platform, an oil emulsion
pipeline was ruptured and an out-of-service water return line severely damaged. A workboat
on contract to an OCS operator was attempting to retrieve a mooring buoy anchor and its
chain. The mooring buoy had previously broken loose from its chain. The workboat was
dragging a grappling hook along the ocean floor near the platform in approximately 100
feet of water when it snagged the pipeline bundle. Believing they had snagged the anchor
and anchor chain, the workboat personnel continued to pull, lifting the bundle off the
seafloor. The oil emulsion pipeline subsequently ruptured at a welded area on the pipeline
riser beneath the platform causing a significant spill.
This accident, along with others similar in nature, has come to the attention of the
Minerals Management Service (MMS). The MMS recommends the following practices and
procedures to prevent a recurrence of this type of accident:
1. Before placing anything in the water or down on the ocean floor, whether in the
vicinity of a platform or in the open ocean, all efforts should be made to ensure that
pipeline and power cable locations are known and avoided. In the event work which has the
potential to damage pipelines and power cables needs to be conducted, the additional
safety margin provided by diver or remote operated vehicle (ROV) assistance should be
considered.
2. Make sure all company and contractor personnel working on the platform or
involved in the handling of equipment to/from a vessel are aware of pipeline and power
cable locations in relation to the platform.
-MMS-
Web Master:
Nollie
Gildow-Owens
Page content last updated 09/20/2006
Page last published 09/20/2006 |
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