This document provides an introduction to pipe-laying vessels, including their concept and applications. Pipe-laying vessels are used to lay pipelines below the ocean surface to transport oil and gas from offshore rigs to shore. They can carry, weld, and lay pipes thousands of meters long. The document discusses dynamic positioning systems that maintain a vessel's position, pipeline route surveys, pipeline coatings for corrosion protection, and desired vessel characteristics such as storage capacity and speed.

1. INTRODUCTION TO
THE DESIGN OF
PIPELAYING
VESSELS
CDT ANIMESH
PANDA
ROLL NO. 05

2. Scope
► CONCEPT OF PIPE LAYING VESSELS
► APPLICATIONS OF PIPE LAYING VESSELS
► TYPES OF PIPE LAYING VESSELS
► DYNAMIC POSITIONING SYSTEM
► PIPELINE ROUTE SURVEY
► PIPELINE COATING
► DESIRED VESSEL CHARACTERISTICS
► MISSION PROFILE

3. ► CONCEPT OF PIPE LAYING VESSELS
► Used to lay pipelines below the surface of the
ocean.
► Pipelines mostly carry crude oil from offshore oil rigs to
the shore.
► Can carry, weld and lay pipes of lengths of thousands
of metres.
► Pipelay vessel operators may be privately held firms, publicly
traded, or state-owned enterprises.
► Physical specifications described by hull type, vessel size
and pipe laying configuration

4. ► APPLICATIONS OF PIPE LAYING VESSELS
► It is a maritime vessel used in the construction of
subsea pipelines
► Typical pipelaying vessel carries a heavy lift crane, used to
install pumps and valves, and equipment to lay pipe.
► Capable of laying pipelines up to 1,420 millimeters in
diameter down to 2,700 meters depth.

5. ► TYPES OF PIPE LAYING VESSELS

6. ► TYPES OF PIPE LAYING VESSELS

7. ► DYNAMIC POSITIONING SYSTEM
► Computer-controlled system to automatically maintain
a vessel’s position and heading by using its own
propellers and thrusters.
► Position reference sensors, combined with wind sensors,
motion sensors and gyrocompasses, provide information to
the computer.
► Fitted onboard mobile offshore drilling units (MODU),
oceanographic research vessels, cable layer ships and cruise
ships.

8. ► PIPELINE ROUTE SURVEY
► Desired route is finalised on the basis of oil rig and
location of shore facilities.
► Route is surveyed by different vessels with
oceanographic survey capabilities.
► Data provided to pipelaying vessel for reference during
pipelaying operations.

9. ► PIPELINE COATING
► Inner surface of steel.
► Outer surface of the carbon steel line pipes are typically
coated with corrosion- resistant FBE or neoprene coating.
► To keep the conveyed fluid warm, the pipeline should be
heated by active or passive methods.
► Outermost layer of HDPE to withstand high pressure and
current migrations.

10. ► DEIRED VESSEL CHARACTERISTICS
► Average depth of sea bed between Mumbai port and Mumbai high is 1355m.
► A typical pipelaying vessel is capable of carrying out operations for approximately 30
days at sea.
► Generally, the crew size required is about 140 to carry out the pipelaying operation.
► Mumbai high is 94 nautical miles off the coast of Mumbai.
► The service speed of all pipelaying vessels lays in the range of 10-14 knots.
► Pipes available in diameters in the range of 6-16 inches.
► The desired carrying capacity of the vessel is about 5000t of pipe in each voyage.

11. ► OWNERS REQUIREMENTS
Water Depth : 1500m
Speed : 13 knots
Pipe Diameter : 6 - 16 inches
Radius of Action : 100nm
Choice of port : Mumbai port
Type of cargo : Subsea pipelines
Storage Capacity (Subsea Pipelines) : 5000 tons
Dwt : 10000 tons
Classification society : Lloyd’s Register

12. Thank You