DSI Underground Systems

Dear Coal Age:
DSI appreciates Mr. Berg’s discussion reinforcing the use of dry rock dust and clarifying the MSHA Policy Manual and application of rock dust for the coal mining industry. As noted in the DSI literature and stated in the original Coal Age article, “The allowance in 30 CFR is for an application of foam rock dust followed by a dry dust application.” DSI supports compliance with the MSHA rock dusting policy.

Foam rock dust is indeed currently allowed by MSHA (per Policy Manual reference) as an approved method (tool) to apply rock dust to rib and roof surfaces in the mine face areas and, as stipulated in the MSHA policy manual, followed by an application of dry dusting to “meet applicable standards.” DSI feels that the use of the DYWI Dust foam rock dust application technology will make the application of the wet dust more effective and consistent, and enhance the rock dust application process in general. Customers (mine operators) and regulatory authorities will determine the future applications of foam rock dust.

DSI Underground Systems is proud of the work of our team in conjunction with government and university research, and regulatory groups on this foam rock dust technology. Currently, DSI is the only company to complete the NIOSH foam rock dust protocol and complete the inerting tests in the 30-liter blast canister at 8 bar of over pressure with mine-scale-equipment-prepared samples. DSI Underground Systems welcomes the opportunity to complete a full scale magnitude inerting test at 15 bar should another explosion test facility become available.

DSI is currently working with U.S. underground coal mining operators, in compliance with the current MSHA Policy allowance language, to apply the patented DYWI Dust rock dusting technology.

Jim Pinkley, president and general manager
DSI Underground Systems