Drones can inspect hard-to-reach locations with both high accuracy and safety. Here it can take high-resolution photos and video, and with the zoom feature, get all the details. This creates a basis for decision-making for maintenance and a data intense and visual overview. If LDAR payload sensors are installed, oil/chemical/gas leakage can be located at a safe distance. Data/images provide a digital status and also acts as a benchmark for the future inspections.