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.
Operations Suspended Following Oil Spill in White Rose Field
A shut-in subsea flowline is believed to be the source of the spill on Husky Energy’s SeaRose FPSO offshore Newfoundland and Labrador. The spill is believed to be the largest in the history of the Canadian province.
API Releases New Edition of Valve Standard
API released an updated valve standard for wellhead and tree equipment, which includes new automatic closure requirements.
InterMoor Acquires BEL Grapnel and Chaser Designs
The deal covers drawings, designs, and cast patterns for BEL’s anchor- and chain-handling equipment.
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24 October 2018
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07 November 2018
24 October 2018