Also some equipments or arrangement may need to be modificated due to rule changes or different operational purpose. In such circumstances the three most important criteria are; revision time, total workmanship and material/equipment cost . Due to these criterias all the Project studies of revision are to be completed before the vessel. In this regard Navis Design and Engineering provides ;

• Onboard survey for predetermination
• Preparation of outline spec for the revision
• Preparation of the concept design and getting Approval from class society
• Preparation of the production drawings and the detailed material list
• On site survey during conversion / modification