Cooldown of Subsea Deadleg With a Cold Spot: Experimental and Numerical Heat-Transfer Analysis
Experimental and numerical heat-transfer analysis was conducted on a T-shaped acrylic-glass pipe, representing a production header in a subsea production system with a vertical deadleg. The header was insulated, while the deadleg was not insulated and carried a cold spot on the top. The experimental conditions were set to mimic those of steady-state production, followed by a 3-hr shutdown (cooldown). The internal fluid temperature and the wall temperature were measured by use of resistance temperature detectors and thermocouples, respectively, while particle image velocimetry was used to measure the velocities in the deadleg. It was shown that the mean velocity field during both steady state and cooldown was periodic, with a clockwise and counterclockwise rotation along the deadleg wall. By use of a k–ω shear-stress transport Reynolds-averaged Navier-Stokes (RANS) model in ANSYS CFX, the thermal field was correctly predicted for 3 hr of cooldown by modeling the cold spot as an isothermal wall. The RANS model was unable to recreate the periodic velocity field observed in the experiment.
Mammoet Awarded Unloading, Transport, Installation Contract for Arctic LNG 2
The contract is Mammoet’s biggest in terms of aggregate tonnage. The Arctic LNG 2 project reached FID in September 2019.
Prudent Ways to Restart Big Projects in Post-Pandemic World
Delays and disruptions have stymied project plans in the past few months. How will companies prevent current stresses from morphing into catastrophic issues?
As Major Offshore Projects Are Pushed Out, Gloomy Year Ahead for the Subsea Market
While a year with less than 200 subsea tree awards seems uncommon, a year with less than 100 awards is an even rarer sight. It has only happened once before since the turn of the century, in 2016 following the oil price crash of 2014–2016.
Don't miss out on the latest technology delivered to your email every two weeks. Sign up for the OGF newsletter. If you are not logged in, you will receive a confirmation email that you will need to click on to confirm you want to receive the newsletter.
20 May 2020
20 May 2020