3. Choice of materials

The materials used for internal piping must be suitable for pressure vessels and have a minimum operating temperature lower than or equal to that of the fluid being transferred.

Material grades and associated standards for pressure vessels are defined in building codes.

For example, seamless tubes must be ordered in accordance with standard NF EN 10216-5 for European regulations and according to the ASME B36.19 for US regulations.

The sheet metal used to manufacture welded rolled tubes must comply with standard NF EN 10028 (Sheets for pressure vessels) and not in accordance with the