Failure Analysis of a Reciprocating Pump Valve

An offshore rig septuplex pump was experiencing chronic suction and discharge valve failures.  A more robust valve design implemented by the manufacturer did not solve the problem.  MSI engineers performed test stand and on-rig pulsation and vibration testingStructural and acoustic natural frequencies were determined by test, as well as the harmonic content of the pressure waves in the cylinders and manifolds. Tribological and metallurgical tests were also performed on the valves, guides, and seats.  It was determined that a firm deposit film which was forming on the valve guides was hanging-up the valves, causing them to close late and slamming shut.  Finite element analysis proved that the impact stress waves were strong enough to lead to fatigue of the valve plates.  The valve guide clearances and seat angle were changed slightly to discourage hang-up and high closure rate, solving the problem.

 

Case Studies and Failure Analysis of a Reciprocating pump valve

 Read about "Replacing A Pressure Reducing Valve With A Hydro Turbine For A Municipal Water Supply"

 

REAL-WORLD EXAMPLES AND CASE STUDIES

MSI In Action

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Improving Cost of Ownership with Vibration Risk Reduction: 1/2

Focusing on vibration and dynamics issues during the plant design phase of a project pays off with smoother commissioning and lower cost of ownership over the plant’s life.

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Simulating the Performance of a Spinal Implant

A manufacturer of an innovative spinal implant approached MSI for help in assessing the implant’s structural integrity.

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Dynamic Analysis of a Street Sweeper for the Manufacturer

Troubleshoot and identify potential opportunities for early bearing failure, MSI performed experimental modal analysis (EMA) and operational deflection shape (ODS) tests on a prototype unit for the manufacturer.