A new pipelaying experience -- Piggyback to dual lay
On the British Gas North Morecambe Development Project in 1993, the derrick-lay barge DLB 1601 used a dual lay operation. A 3 inch {O} pipeline was laid piggybacked onto a 36 inch {O} pipeline for the shore pull operation and then separated to follow a dual lay for the offshore section. Transformation for piggyback laying mode to the dual lay mode was performed making use of a newly developed transition operation. This paper reports the challenges which had to be met to ensure a successful outcome. Results of various engineering studies are first presented. The set-up and observations of the (onshore) prototype testing are then described. Lastly, the special measures taken for the transition operation and certain field observations during the installation phase are briefly discussed. It is believed that the information presented in this paper will be of use to other similar projects in the future.
- OSTI ID:
- 160717
- Report Number(s):
- CONF-950501--
- Country of Publication:
- United States
- Language:
- English
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