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Flow assurance | subsea


procedures to validate compressive strength, durability, and thermal performance. The system is said to eliminate the need for the use of the multiple materials and adhesive tie-layers usually employed in fl ow assurance systems, which is said to allow a thinner coating profi le to be maintained while achieving higher consistency in K-factor between tree, to line pipe, and to fi eld joint. The Neptune P coated line pipe produced at the


Bayou Wasco facility is intended solely for use with the Neptune F insulation coating for fi eld joints. This simple, reproducible fi eld joint coating process was recently demonstrated by UK-based Pipeline Induction Heat (PIH), part of the CRC Evans group of companies, to produce high-quality fi eld joints on an eight –inch diameter line pipe. “PIH and Dow have a long history of collaborating to bring innovation to offshore oil and gas production,” says Tony Pontefract, director of business development at PIH. “Through our collaboration on Neptune F Insulation, we now have the ability to offer customers a simpler, reproducible fi eld joint coating process, competitive cycle time, high mobility and a compact equipment footprint.” According to Dow, the Neptune technology provides


the widest end-to-end installation and operating temperature range of any wet insulation system currently available on the market. The company claims the system offers excellent physical properties, remaining highly fl exible down to -40°C and retaining its thermal stability at service temperatures of up to 160°C. The system has been tested for use at depths of up to 4,000m. Dow worked closely with polymer and syntactic


foam-based coating specialist Trelleborg Offshore in development of the Neptune C component for subsea


architecture protection. Since its introduction early last year, the Neptune


system has won a World Oil Award for Best Production Technology and an Offshore Technology New Technology Award.


Click on the links for more information:  www.bayoucompanies.comwww.dow.comwww.pih.co.ukwww.trelleborg.com


Above: Flexural fatigue testing of the Neptune P coating simulates


real-world exposure


Low temperature performance of Neptune P and F subsea insulation coatings Product


Neptune P (line pipe applications) Neptune F (fi eld joint applications) 50


-40 0


50


65 90 64 72 87 67


Temperature (˚C) Elongation at break (%) -40 0


Source: Dow Chemical Company


Typical properties of Neptune subsea fl ow assurance insulation system


Installation method Depth rating


Subsea service temperature, ˚C


Thermal conductivity under SST conditions1 Density (ASTM D792, 23˚C)


Heat capacity (ASTM E1269, 0 to 160˚C) 1 160˚C at 300 bar for 28 days


Reel, S-Lay, J-Lay At least 4,000m -40 to +160 0.152 1.1


1.2 to 1.7 Source: Dow Chemical Company May 2013 | PIPELINE COATING 33


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