From Offshore Pipelines

10.1 Introduction

Flexible pipes have been used in the oil industry since 1972, when Coflexip was awarded a patent to build a high pressure, flexible steel pipe. The first application was used in drilling as a 15,000 psi Kill and Choke line. Since then, flexible pipe designs have improved to produce the flowlines and risers that are now used in the offshore oil industry.

For deepwater, the flexible pipes are used mainly for dynamic risers from a subsea pipeline end manifold (PLEM) or riser tower to a floating production system such as an FSO, FPSO, and TLPs. The other uses are static risers, static flowlines, subsea jumpers, topside jumpers, and expansion joints. Flexible pipes are used for versatile offshore oil and gas applications including production, gas lift, gas injection, water injection, and various ancillary lines including potable water and liquid chemical lines.

The main advantages of flexible pipelines are:

  • Ease and speed of installation

  • No large spans because it follows the contours of the seabed

  • Almost no maintenance for life of the project

  • Good insulation properties are inherent

  • Excellent corrosion properties

  • No field joints because the pipe is of continuous manufacture

  • No need of expansion loops

  • Can be made with enhanced flow characteristics

  • Sufficient submerged weight for lateral stability

  • Accommodates misalignments during installation and tie-in operations

  • Diverless installation is possible no metrology necessary

  • Load-out and installation is safer, faster, and cheaper than any other pipe application

  • Retrievability and...

Products & Services
Expansion Joints
Expansion joints connect two fixed assemblies or pipes and provide allowance for movement due to service load, shock, or thermal cycles.
Pipe Hangers and Conduit Hangers
Pipe hangers and pipe supports are used to support hanging pipe.  They include clevis hangers, beam clamps, pipe clamps, brackets and pipe straps.
Hot Tapping Machines
Hot tapping machines are used to safely drill into pressurized pipe to add main or service lines without interrupting the service.
Gas Fittings
Gas fittings are specifically designed for use with gases, such as flammable propane or hazardous phosgene. These types of fittings have a reverse thread; meaning, the threads are cut in the reverse direction from all other fittings so that gas lines cannot be connected to air lines, water lines, or vent lines.
Piping Services
Piping Services providers service industries like oil refineries, chemical processing facilities, oil pipelines, and other industrial pipe applications to install, repair and maintain industrial piping systems.

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