Vented explosion-proof enclosure research

The feasibility of developing Retimet-vented explosion-proof enclosures for use in underground coal mines has been studied. The results of laboratory tests of Retimet, an open-cell stainless steel foam material, used as a flame arrester on explosion-proof enclosures during internal methane-air explosions are presented. In general, the Retimet proved to be an excellent flame arrester, successfully quenching the flame front in all tests using 9.74% methane-air mixtures. There was no significant thermal damage and no observable shrinkage; however, there was a slight change in color. The Retimet stood up well physically; periodic examination revealed only a light weight loss after repeated explosions. The success of this material in the laboratory has resulted in an agreement with the US Mine Safety and Health Administration´s Approval and Certification Center to conduct joint large-scale testing of Retimet on a prescribed test vessel and, if successful, to develop recommendations for its use on vented explosion-proof enclosures that would be less massive than their conventional counterparts.<>