VIDEO: O-lay Pipeline Installation Method Presented

VIDEO O-lay Pipeline Installation Method Presented

O-lay is a state-of-the-art disruptive method to install offshore pipeline in a safe way and with a minimum of costs.

The method has following stages: Welding and construction onshore, pulling the pipe in the water supported by floatation devices, spiraling the pipe in a flat mono-layer spiral on the surface of the water while the steel remains in its elastic area (this is the “O” in O-lay) , transportation of the spiral towards the location where it has to be laid. Finally the pipe is laid to the bottom with the help of a simple but specially designed lay barge.

The laying is done with a type of S-lay where the pipe will leave the barge at an end position or through the center of the barge which will give the barge a better stability and a better floating support.This means that the pipe can be laid deeper with a lighter barge.

When the spiral is made the method makes use of special bending method whereby at certain intervals “points of inflection” are applied. These points are actual end points of anchor lines in the outer circumference of the ‘spiral to be made’. The method can also be used to retrieve pipe from the sea bottom. Instead of the anchor lines, the method makes use of small but powerful boats which are then attached to the pipeline for creating the perfect circle. All boats are attached to a dynamic positioning system that will “coordinate” the whole operation.

With this method pipes can be laid in very shallow water (some meters of depth whereby a special pontoon will be used) and very deep water (several thousands of meters with the aid of a lay barge)

Due to the fact that almost all work is prepared onshore (including welding and inspecting the pipe) the pipe can be installed at a speed of 25 km per day.

Subsea World News Staff, April 9, 2013; Image: o-lay.net

Share this article

Follow Subsea World News

Events>

<< Jul 2015 >>
MTWTFSS
29 30 1 2 3 4 5
6 7 8 9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31 1 2

Africa International Petroleum Conference & Exhibition (AIPEC) 2015

The conference will cover areas like While the Window of Opportunities Continues to Widen for the Oil and Gas Industry, Creating Immense…

read more >

Marine Warranty Surveying

Marine warranty surveyors ensure that best industry practice and correct procedures are followed in the planning and execution of critical…

read more >

Practical Seismic Interpretation with Petrel

The course will cover the essential Geological and Geophysical information necessary to visualize and interpret seismic data…

read more >

4 week Introduction to ROV Systems

The course has been formulated to provide a basic understanding of how to safely perform operations and maintenance on an ROV system…

read more >