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Surge Analysis of a Seawater Intake Pumping Station

SectorPower, Oil & Gas
DisciplineCFD — Transient Hydraulics
MethodMethod of characteristics
Confirming pump trip and valve closure events stay within pipeline pressure ratings, and closing a column-separation risk.

01 — ChallengeUnverified transient pressure response to pump trip

A seawater intake pumping station needed transient surge analysis to confirm that pump trip and valve closure events would not cause pipeline overpressure or column separation — neither of which a steady-state hydraulic model can capture.

02 — ApproachFull pipeline transient model, multiple trip scenarios

A transient hydraulic model of the full intake-to-discharge pipeline was built using the method of characteristics, incorporating pump curves, check valve dynamics, and air valve locations, then run for single-pump trip, total power failure, and emergency valve closure scenarios.

03 — Simulation ResultTransient surge pressure, with vs. without relief valve

Transient pressure trace at pump discharge with and without surge relief
Transient surge pressure, with vs. without relief valveFig. 1 of 1

04 — Quantified ResultsBefore / After

ParameterBaselineResult
Peak surge pressure vs. normal operating1.6× (within MAOP)→1.6× (confirmed)
Peak transient pressure after mitigationbaseline→−31%
Column separation risk at low pointidentified→resolved with air valve resizing
05 — Business Impact

Identified a pipeline rupture risk that steady-state analysis alone would have missed, avoiding unplanned downtime and environmental exposure.

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