Analysis of Data

The 1,000,000 cycle Endurance Test concluded with no leaks from all of the Zero-Leak Gold plugs being tested. It was noted that during the 1,000,000 cycle Endurance Test that a slight, discernible amount of O-Ring material was observed at several test ports (see Appendix B pages 35-43). This material was observed on SAE port size #10 for Aluminum and SAE #8 and #12 in Ductile Iron (see pictures in Appendix B). Although this condition was noted, there were no leaks from the corresponding Zero-Leak Gold plugs. It should also be noted that the EPCO Zero-Leak plugs did run continuously for 1,000,000 cycles (except for short shut downs for stand maintenance).

The Zero-Leak Gold plugs passed the 1,000,000 cycle Endurance, Proof and Burst Tests with no visible leaks at values in Tables 1&2.

During the test O-Ring Ports were labeled and scribed with a scratch across the fitting leading into the manifold. From this mark it could be determined if any movement of the fitting in relation to manifold had occurred (see-attached photographs). There had been no movement from these marks during the test. Torque values were recorded after the test to check if values had changed (see Table 3). The torque removal values for the EPCO Zero-Leak Gold plugs were very high. From marks placed on plug and manifold there was no noticeable rotation of plugs and the plug threads were not distorted.