The experimental investigation of flow induced pulsations in corrugated flexible pipes in service with supercritical carbon dioxide
conference paper
Internally corrugated flexible pipes and hoses are prone to generate high amplitude tonal pressure pulsations (singing, also called FLIP). This is a common experience in flexible risers and flowline used in the offshore oil & gas industry. Models to predict the onset conditions when this singing occurs have been developed for this market. Similar flexible lines are and will be used for CO2 transport, for instance in CCS projects. The transport conditions will be mainly in the supercritical region. To verify if singing occurs in the supercritical region and if the prediction models are still valid, small scale singing experiments have been done with a 1.37m long 6mm ID hose with pure CO2 at conditions ranging from 2 to 180 bara. Clear singing was shown to occur at all pressures with similar characteristics (Strouhal number and amplitudes) between CO2 operations as low pressure air conditions. The onset velocity could be matched based on an energy balance method and on a feedback criterion. The current tools employed for natural gas transport do need adaptions to be valid for CO2 transport calculations. The main conclusion is that flow induced pulsations in corrugated flexibles are generated in CO2 at supercritical conditions and that when these type of flexibles are used for CO2 transport, the same screening is advised as is common for the use of flexibles for natural gas transport.
Topics
TNO Identifier
992424
ISSN
0277027X
ISBN
978-079188746-2
Publisher
ASME
Article nr.
PVP2023-103450
Source title
Proceedings of the ASME 2023 Pressure Vessels & Piping Conference, PVP2023, 16-21 July 2023, Atlanta, GA, USA
Collation
10 p.
Files
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