Time-Based Modeling of Ship Ballasting for Increased Performance

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Presentation transcript:

Time-Based Modeling of Ship Ballasting for Increased Performance Dominik Fry, P.E. Business Development Engineer Engineered Software Inc. October 16, 2017

Introduction Ship Piping Network Mission Problem Solution 12 hour deballasting Problem Current procedure inadequate Solution System efficiency Multiple scenario simulations

Asymmetrical Design What happens if we start pumping from ALL the tanks simultaneously?

Current Procedure Inadequacy Pump down first three tanks to 6.5 ft Pump down second three tanks to 6.5 ft Pump down individually to 0.5 Flow control valve 100% open until cavitation is heard 13-15 hour time to completion

Pump Cavitation

Barringer Curve Barringer Curve – Efficiency and Reliability are related

Optimization Options Keep 30% NPSHr margin ration (30% safety factor) Option A Pump all tanks down together to pre determined level Finish by pumping each tank individually Option B Pump down all tanks to 0.5 ft Isolate each tank when minimum level is reached

Option A 12:10 of total pumping time

Option B 11:41 of total pumping time Least possible cavitation

Simulation

Thank You Questions?