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18 Questions

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Subsea Pipeline Insulation Methods

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Questions and Answers

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

To increase the tension during pipeline installation

To increase the length of the pipeline that can be fabricated

To reduce the number of support vessels required

To provide a corrosion-free environment internally (correct)

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

32''OD

70''OD

60''OD (correct)

40''OD

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

1 - 1.5 km per day (correct)

2 - 3 km per day

5 km per day

3.5 km per day

What is a common insulation material used for subsea pipelines?

GSPU Signup and view all the answers

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

Less tension required Signup and view all the answers

What are the two limitations of the towing method?

Length of fabrication and towing limit Signup and view all the answers

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

All of the above Signup and view all the answers

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

Slippage of the curved pipeline on the sea floor Signup and view all the answers

What is the purpose of a pipeline route survey?

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

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

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

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

To prevent slippage at initiation Signup and view all the answers

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

The survey company 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?

It is reduced by 50% Signup and view all the answers

What is the advantage of ReelLay pipe over S lay?

It has lower tension and more control Signup and view all the answers

What is the typical lay rate of ReelLay pipe?

14 km per day Signup and view all the answers

Why are offshore pipelines trenched?

For physical protection from anchor dropping or trawl dragging Signup and view all the answers

What is a limitation of ReelLay pipe?

It has limited coating types Signup and view all the answers

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

It has a single welding station Signup and view all the answers