Subsea Pipeline Insulation Methods
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Subsea Pipeline Insulation Methods

Created by
@SpotlessBlueTourmaline

Questions and Answers

What is the primary purpose of the carrier pipe in the towing method of pipeline installation?

To provide a corrosion-free environment internally

What is the maximum installable pipe size using the S-Lay method?

60''OD

What is the typical lay rate of the J-Lay method?

1 - 1.5 km per day

What is a common insulation material used for subsea pipelines?

<p>GSPU</p> Signup and view all the answers

What is the main advantage of the J-Lay method compared to S-Lay?

<p>Less tension required</p> Signup and view all the answers

What are the two limitations of the towing method?

<p>Length of fabrication and towing limit</p> Signup and view all the answers

What is the primary consideration while selecting a subsea pipeline route?

<p>All of the above</p> Signup and view all the answers

What is the minimum required pipeline route curve radius (Rs) determined to prevent?

<p>Slippage of the curved pipeline on the sea floor</p> Signup and view all the answers

What is the purpose of a pipeline route survey?

<p>To obtain site-specific information including bathymetry, seabed characteristics, and soil properties</p> Signup and view all the answers

What happens if the pipeline-soil friction resistance is too small?

<p>The pipeline will spring-back to a straight line</p> Signup and view all the answers

What is the purpose of calculating the required minimum straight pipeline length (Ls)?

<p>To prevent slippage at initiation</p> Signup and view all the answers

Who is contracted to obtain site-specific information for the pipeline route survey?

<p>The survey company</p> Signup and view all the answers

What is the impact on the pipe lay rate if one station spends 10 minutes while others spend 5 minutes?

<p>It is reduced by 50%</p> Signup and view all the answers

What is the advantage of ReelLay pipe over S lay?

<p>It has lower tension and more control</p> Signup and view all the answers

What is the typical lay rate of ReelLay pipe?

<p>14 km per day</p> Signup and view all the answers

Why are offshore pipelines trenched?

<p>For physical protection from anchor dropping or trawl dragging</p> Signup and view all the answers

What is a limitation of ReelLay pipe?

<p>It has limited coating types</p> Signup and view all the answers

What feature of J-lay allows it to weld multiple pipe joints?

<p>It has a single welding station</p> Signup and view all the answers

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