SWAC Aquaculture OTEC Services Papers
1.4 m (55″) NELHA deep water intake pipeline during assembly.

Since 1979 Makai has designed a number of bottom mounted, down-the-slope, catenary, and pendant polyethylene pipelines for use in SWAC and outfalls.

These pipelines are suited for:

  • Seawater Air Conditioning (SWAC)
  • Ocean Thermal Energy Conversion (OTEC)
  • Marine Outfalls
  • Aquaculture and mariculture
  • Industrial Cooling and Power:
    • Waste heat power cycles
    • Power plant cooling
    • Liquefied Natural Gas (LNG) process cooling
    • Chemical process cooling
    • Other industrial processes with large cooling loads

Makai’s long experience with pipeline design and deployment has led to very cost-effective fabrication and deployment methods. One example is a typical SWAC polyethylene pipeline, which is fused into long sections onshore, filled with air, then towed into place and lowered to the seabed – often in a single day – minimizing expensive marine construction and weather-related risks.

Makai has also conducted extensive field research on practical and cost-effective methods of deploying large diameter pipelines – in both deep and shallow waters. In order to ensure the safety or our designs, Makai has developed special test equipment and procedures for testing polyethylene pipes under extreme loads and under negative (suction) pressure.