Hydrocarbon gas leaks creates potential dangerous situations with major accidents representing worst case scenarios. Smaller gas leaks are also unwanted as they represents of escalation and often lead to shut down or reduced production. Small gas leaks also represent in total a significant amount of gas which is detrimental to our atmosphere. The natural gas industry continuously invest considerable resources into prevention of gas leaks. Certain technical components more prone to leak are valves, flanges, gaskets and heat exchangers. It is therefore important to ensure joint integrity on the facilitation and the execution level.In the following paper you will see some incidents related to the leaks and the required checking in order to prevent these incidents.