PRESERVATION /MOTHBALLING

After the completion of a process system or pipeline commissioning, it is mandatory to protect the system from any corrosion or degradation for a period of time. Nitrogen is ideally suited for this type of operation as it is an inert gas. Nitrogen is the most common gas used as it is free of moisture. It does not enable conversion of the existing atmosphere but rather maintenance of the cleaned atmosphere condition and provides the corrosion control mechanism. The act of Elimination of oxygen makes the purpose achievable. The purging of the original atmosphere enables exclusion of Effective oxygen by repeated pressurization with nitrogen followed by venting until the oxygen concentration is less than 1%. The utilization of the hydro-test fluid for mothballing is highly practicable. To avoid unnecessary operational complications, either dehydrated "dry" produced gas or "wet" gas slug dosed with corrosion inhibitors shall be used as the medium instead of treated water. GPS work out on the chemical type, dosage rate based on safe keeping period.