HPI, LLC, a supplier of turbine control, fuel valve replacement and mechanical overhaul services, has acquired U.K-based DLE Aero Ltd., a services firm specializing in Dry Low Emissions/Dry Low NOx (DLE/DLN) mapping. Through DLE/DLN mapping, owner/operators of gas turbines can realize lower emissions and increased combustion efficiency, enabling compliance with more stringent environmental and permitting regulations in the U.S and EU.