This part of ISO 15590 specifies the technical delivery conditions for bends made by the induction bending process for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623 . This part of ISO 15590 is applicable to induction bends made from seamless and welded pipe of unalloyed or low-alloy steels. This part of ISO 15590 specifies the requirements for the manufacture of two product specification levels (PSLs) of induction bend corresponding to product specification levels given for pipe in ISO 3183 . This part of ISO 15590 is not applicable to the selection of the induction bend product specification level . It is the responsibility of the purchaser to specify the PSL, based upon the intended use and design requirements , see also ISO 3183:2007 introduction. This part of ISO 15590 is not applicable to pipeline bends made by other manufacturing processes.