Investigation of temperature rise in substation during emergency

Abstract

During a TTS verification at Kårstø Processing Plant there where raised a non-conformity to Statoil specification and requirements with regard to temperature rise in substations when HVAC is shut down. One could not find any documentation on whether Statoil were compliant with specifications and requirements. This finding is further implemented and followed up as a deviation to TR2237 [3] and in the Total Risk Analysis[App. D,D04] at Kårstø Processing plant to a situation where gas is detected in the air intake of a substation and one have to shut down the HVAC. The purpose of this thesis is to find the temperature increase inside a substation when HVAC is shut down due to gas detected in the air intake. To find the temperature increase one have to identify heat load to the room and heat leaving the room. By comparing measurements, experimental data and a numerical analysis good enough to make decisions on when or if one have to close down the substation. Results from the numerical analysis will be seen in comparison with statutory regulations and internal specifications and requirements. Measurements and experiment were performed during normal operation of the plant, and it took place at one of the substations placed in or near area where one have the highest probability of seeing a gas leakage.