Study improves estimation of damage from stuck pigs, hydrates

Alessandro Terenzi Saipem Fano, Italy Two new field-verified calculation methods can provide efficient simulation tools for both pipeline design and operation analysis in assessing likely damage from dislodging a stuck pig or hydrate plug. A stuck pig or formation of a hydrate plug can generate fast transient movements of large solid objects in natural gas pipelines, as can inadequate control of pig velocity during receiving operations. Creating a pressure jump across a stuck pig can dislodge it but can also create a sudden displacement, propelling the pig at high velocities and potentially damaging pipe bends or elbows. A similar phenomenon occurs when a pipeline is depressurized followi...

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