FET | Global Tubing Coiled Line Pipe

Coiled line pipe (CLP) is a long, continuously milled length of steel tubing. The pipe is externally coated in line before spooling and final testing. It is ideally suited for well tie-ins, long flowlines and pipelines, and it allows for a project to be completed without field welding.

Coiled line pipe (CLP) is made from multiple flat cuts of hot rolled sheet steel called master coils. These master coils are slit into thinner members called strips, joined together using bias welds (skelp end welds) and then fed into a pipe mill that turns them into a continuous rolled tube. From there, the rolled tube is welded and sized into a long continuous steel pipe, with lengths that can span multiple miles.

During the milling process, several inspections and tests are performed. Eddy current (EC/ET) and ultrasonic (UT) non-destructive testing methods are deployed per industry standards to ensure homogeneity in the longitudinal weld, bias welds and base material. Mechanical testing (i.e.- tensile, hardness, flattening and flaring) is performed to ensure compliance with industry standards and customer requirements.

After milling and inspection, CLP is installed onto a shipping spool to accommodate the lengths required by the customer. Hydrostatic testing, drifting and a nitrogen purge ensure that the pipe is ready for operation.

Coiled line pipe is idea for onshore and offshore applications:

• Production well flowlines
• Crude oil and natural gas transfer
• Water and gas injection lines
• Temporary and permanent fuel lines (natural gas, gasoline, diesel, A1 jet fuel)
• Chemical injection lines (MEG, MeOH, etc.)
• Methanol injection lines
• Service lines
• Subsea flowlines and pipelines
• Umbilical tubes
• Risers and tiebacks

Installing coiled line pipe (CLP) is the same as normal carbon steel stick pipe when it comes to welding, coating repairs, burial and pre-commissioning; however, deployment of CLP is more like the installation of a flexible composite pipe product. The spool is loaded into a spooling unit, the pipe is threaded through a straightener, and another piece of construction equipment pulls the pipe from the spool and down the right of way. Once the pipe is on the ground, it can be handled and roped into the ditch in the same manner as stick pipe.

Coiled line pipe (CLP) is an excellent alternative to conventional 40 ft double random length line pipe. CLP is available in outside diameters up to 5 inches and a range of wall thicknesses that can be utilized in applications with pressure ratings beyond 15,000 psi for flowlines and pipelines, chemical injection lines or umbilical applications. CLP is also compatible with other pipe systems, such as 40 foot (12 meter) API 5L joints.

State-of-the-art 3-layer polyethylene (3LPE), 3-layer polypropylene (3LPP) or abrasion resistant overlay (ARO) coatings provide unrivalled protection for the pipeline during installation and for its design life. Long, continuous pipe lengths can be utilized in directional bore pulls or crossings for quick and less risky deployment.

Depending on pipe size, nearly 1 mile of pipe can be shipped on our standard shipping spools and installed without a single pipe-to-pipe weld. CLP can be laid directly from the shipping reel or consolidated into larger carousels and vertical reels. By removing critical path items such as joint welding, X-ray inspection, heat treat and field joint coating from the field process, CLP greatly reduces installation times and the associated costs with large installation crews.