Eductor-jet pumps are useful for draining areas which may contain volatile fluids (which could ignite if exposed to the workings of a standard electric or internal combustion engine powered pump) or high levels of debris (which could damage screws or blades in conventional pump designs). Some coal fired Thermal_power_stations may also use the jet pumps to pump out coal dust from dust hoppers to storage yards. In this case a seperate high pressure pump is used as a driving force required for the pressurised fluid at the inlet of the jet pump.