Tube Pullout Testing
During the pre-outage planning phase of a retubing project, pullout testing may be recommended to develop the required tube expansion criteria and parameters. This test is critical to obtain optimum tube-to-tubesheet joint strength during the project execution phase. Testing is designed specifically for each application to replicate expected field conditions. These test results will be compared against others in our database to establish the initial parameters and basis for the technical procedures developed that will be used during the execution of the project.
D&Z maintains an extensive database of pullout testing results on a variety of material combinations and types, including tube and tubesheet material, tubesheet thickness, serrated and non-serrated tubes, and flared and non-flared. We analyze this data to determine:
- Tube pullout strength under a range of loads
- Average wall reduction
- Which torque value will provide optimal tube-to-tubesheet seal during tube expansion
- How serrations affect tube pullout strength