Typically, seamless tubes made of AISI 316/L steel according to ASA213/A269 or similar standards are used with instrumentation. It is important for the tubes to meet these standards because of the quality of their finish and allowable tolerances, especially of the outer diameter. Tubes International supplies high quality HPS 1 tubes in standard bars with lengths up to 6m, whereas coiled tubes, including degreased tubes for operation with oxygen, are available on request..