this tells about the different pipe laying vessels,and their construction

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