Method and system for determining corrosion or a corrosive environment under insulation

A method for determining corrosion or a corrosive environment under insulation of an object, for example a tubular pipe, covered by an insulation layer comprising an inner insulation layer for insulating the object and an outer protective layer for protecting the inner insulation layer, wherein use is made of a corrosion determining assembly comprising multiple temperature sensors and a processor connected to the temperature sensors, wherein the method comprises:

• mounting the multiple temperature sensors on corresponding sensor locations on an outside of the outer protective layer such that the insulation layer is between the temperature sensors and the object and such that the temperature sensors are in thermal contact with corresponding sensor locations which sensor locations are on the outside of the protective layer;
• measuring a temperature of each of the sensor locations of the insulation layer with the corresponding temperature sensor;
• sending the measured temperatures to the processor;
• comparing, by the processor, each of the measured temperatures to corresponding expected temperatures;
• and
• determining, by the processor, a corrosive environment under insulation or corrosion under insulation of the object at one or more of the sensor locations based on the comparison of the measured temperatures to corresponding expected temperatures.