The DeltaV-Seal will not damage the flange, even though the gasket might leave an insignificant visual imprint that has absolutely no effect on the sealing capabilities. The gasket material and the flange are compatible, and the angle on the sealing ridge is 60° which makes the ridge edge the most likely to deform and adapt to the flange face. This ensures that deformation of DeltaV-Seal will occur before damaging the flange.
In a test ordered by Shell, evaluate the DeltaV-Seal on a raised face (RF) flange surface. Any potential marks on the RF flange surface created by the DeltaV-Seal were measured by an independent party, (in this test SINTEF Materials and Chemistry performed the measurements). These results were further evaluated by OTECHOS, and compared to ASME PCC-1 Appendix D-2M Allowable Defect Depth vs Width Across Face.
The results showed a vast variety in terms of visibility of marks. The radial width of the marks showed to be consistent, depending on if the DeltaV-Seal ridges made contact at the top or bottom of the existing grooves from the surface finish.
In conclusion, none of the samples in these tests showed unacceptable dent-widths.