it is a forklift that has been modified (in this case by Pyroban) to be some version of explosion proof. there are several zone and level ratings and some actually have gas sensing systems that proactively shut down the the unit when the contamination rate is too high. i am sure there are more but i am aware of two companies that provide this service "Pyroban" and in Holland "Mitrex". i have had some dealings with Mitrex and they are very helpful in support of their product. i do not know if any of these systems meet U.S. "UL" standards but these conversions are a viable option for the offshore petro industry and are becoming more popular every day.