Overview
| Project No. | 73 |
|---|---|
| Contract No. | DTRS56-96-C-0010 |
| Research Award Recipient | Battelle |
| AOTR | Empty Value |
| Researcher Contact Info | 505 King Avenue Columbus, Ohio 43201 http://www.battelle.org |
| Project Status | Closed |
|---|---|
| Start Fiscal Year | 1996 (10/01/1995) |
| End Fiscal Year | 1998 (09/30/1998) |
| PHMSA $$ Budgeted | $0.00 |
Main Objective
This report documents the findings of an evaluation of the magnetic, mechanical, chamical and metallurgical properties of 36 pipeline materials that were removed from gas-transmission service. There were three objectives of this evaluation. The first was to determine whether there were clear correlations between magnetic properties and mechanical properties. The second was to determine whether magnetic properties change significantly with the application of stresses and strains. The last was to assemble a database of both magnetic and mechanical properties for future development activities.
Public Abstract
This report documents the findings of an evaluation of the magnetic, mechanical, chamical and metallurgical properties of 36 pipeline materials that were removed from gas-transmission service. There were three objectives of this evaluation. The first was to determine whether there were clear correlations between magnetic properties and mechanical properties. The second was to determine whether magnetic properties change significantly with the application of stresses and strains. The last was to assemble a database of both magnetic and mechanical properties for future development activities.
The results of this evaluation show that there is no clear correlation between magnetic properties and commonly measured mechanical properties. So, there is no easy way to predict magnetic properties for commonly known mechanical properties. In order to detect mechanical damage, the change in magnetic properties at the damage must be outside the natural variability of typical magnetic properties. The changes in magnetic properties due to compressive stresses and strains are large enough to fall outside the typical scatter band of properties. So, detecting compressive damage may be possible withoiut measuring the magnetic properties of a pipeline steel. The same cannot be said of tensile stresses and strains.