The objective of these Guidelines is to ensure the safe operation of liquid tank boundaries and process pressure vessels for oil, gas, and water, as well as other components of bulk chemical tankers constructed with lean duplex stainless steels.
These guidelines cover various aspects such as chemical composition, delivery condition, mechanical properties, pitting corrosion resistance performance, a list of suitable products for carriage, and control of the construction process during the intended service life.
These Guidelines are meant to be applied for works approval and survey of lean duplex stainless steels that are manufactured in accordance with the requirements specified in CCS Rules for Materials and Welding.
These Guidelines are applicable to lean duplex stainless steels used in the construction of cargo tanks, process pressure vessels for oil, gas, and water, and other components of bulk chemical tankers.
In addition to the provisions mentioned in these Guidelines, lean duplex stainless steels must also comply with the relevant requirements for hull structural steels outlined in Chapter 3, PART ONE of CCS Rules for Materials and Welding.
This document was published on 13 June 2023 and will become effective on 1 July 2023.