A client had determined that in very dusty environments where their base-ported pressure filter was used, particles can get in between the threads of the tube and cap.

The existing design uses standard fine pitch threads which are more easily damaged by dust particles. Therefore, they designed a filter using coarser, more dust/dirt tolerant, Acme threads. Since this was a new thread profile, they were concerned about potential fatigue life.

O’Donnell Consulting was asked to determine if Finite Element Analysis could be used to predict fatigue life of new designs in lieu of testing. The estimate of life for the tube threads based on strain-life methodology predicted 7.0E6 cycles.


We perform engineering design, analysis and troubleshooting on equipment including fasteners, valves and piping.

Give us a call to discuss your engineering challenges.

Related Projects

Failure Analysis on Leaking Nickel Cemented Tungsten Carbide (WC) Pump Seal
Failure Analysis of Cracked Brass Fittings In a Chilled Water HVAC System
Investigation of Leaking Ball Valve in a Pipeline

Similar Services

Engineering Troubleshooting
Finite Element Analysis
Murals of Projects


Tom O’Donnell, PE
Introduction to Fatigue Analysis
Links to Engineering Resources

(412) 835-5007

Scroll to Top